Onkyo HTP-420 Service Manual

SERVICE MANUAL

SERVICE MANUAL

5.1-CH HOME THEATER SPEAKER PACKAGE

MODEL HTP-420(B)/(S)

Front Speakers (L / R)

"SKF-420F"

Center Speaker

"SKC-420C"

Surround Speakers (L / R)

"SKM-420S"

HTP-420

Ref. No. 3808

042004

Powered Subwoofer

"SKW-420"

BMDD
BMDC

--­BMPA

---

---

Black and Silver models

120V AC, 60Hz
120V AC, 60Hz

--­230-240V AC, 50Hz

---

---

SMDD
SMDC
SMDT
SMPA
SMGT
SMPT

120V AC, 60Hz
120V AC, 60Hz
120V AC, 60Hz
230-240V AC, 50Hz
220-230V AC, 50/60Hz
230-240V AC, 50Hz

SAFETY-RELATED COMPONENT
WARNING!!

COMPONENTS IDENTIFIED BY MARK ON THE

SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE

CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.

REPLACE THESE COMPONENTS WITH ONKYO

PARTS WHOSE PART NUMBERS APPEAR AS SHOWN

IN THIS MANUAL.

MAKE LEAKAGE-CURRENT OR RESISTANCE

MEASUREMENTS TO DETERMINE THAT EXPOSED

PARTS ARE ACCEPTABLY INSULATED FROM THE

SUPPLY CIRCUIT BEFORE RETURNING THE

APPLIANCE TO THE CUSTOMER.

SPECIFICATIONS

Powered Subwoofer (SKW-420) Center Speaker (SKC-420C)

HTP-420

Type :

Input sensitivity/impedance :
Maximum output power :
Frequency response :
Cabinet capacity :
Dimensions (W x H x D) :

Weight :
Driver unit :
Power supply :
America :
Others :

Power consumption :
America :
Australia :
Others :
Other :

Front Speaker (SKF-420F)

Bass-reflex with built-in

power amplifier

220 mV / 15 k ohm

150 W (Dynamic Power)

30 Hz - 150 Hz

1.15 cubic feet (32.5 L)

9-1/4" x 20-3/8" x 16-3/16"

(235 x 518 x 411 mm)

28.2 lbs. (12.8 kg)

8 inch Cone Woofer

AC 120 V, 60 Hz

AC 230-240 V, 50 Hz

AC 220-230 V, 50/60 Hz

75 W

77 W

77 W

Auto Standby function

Type :
Impedance :
Maximum input power :
Output sound pressure level :
Frequency response :
Crossover frequency :
Cabinet capacity :
Dimensions (W x H x D) :

Weight :
Drivers unit :

Terminal :
Other :

2 Way Bass-reflex

8 ohm

100 W

84 dB/W/m

60 Hz - 50 kHz

5 kHz

0.2 cubic feet (5.6 L)

17-1/8" x 5-1/8" x 7-1/16"

(435 x 130 x 179 mm)

7.5 lbs. (3.4 kg)

4 inch Cone Woofer x 2

1 inch Balanced Dome tweeter

Color-coded push type

Magnetic shielding

Surround Speaker (SKM-420S)

Type :
Impedance :
Maximum input power :
Output sound pressure level :
Frequency response :
Crossover frequency :
Cabinet capacity :
Dimensions (W x H x D) :

Weight :
Drivers unit :

Terminal :
Other :

2-way Bass-reflex

8 ohm

100 W

84 dB/W/m

60 Hz - 50 kHz

5 kHz

0.2 cubic feet (5.6L)

4-7/8" x 18-5/16" x 7-1/16"

(124 x 465 x 179 mm)

7.5 lbs. (3.4 kg)

4 inch Cone Woofer x 2

1 inch Balanced Dome tweeter

Color-coded push type

Magnetic shielding

Type :
Impedance :
Maximum input power :
Output sound pressure level :
Frequency response :
Crossover frequency :
Cabinet capacity :
Dimensions (W x H x D) :

Weight :
Drivers unit :

Terminal :

Specifications and appearance are subject to change

without prior notice.

2-way Bass-reflex

8 ohm

100 W

82 dB/W/m

60 Hz - 50 kHz

5 kHz

0.08 cubic feet (2.3 L)

5-13/16" x 11" x 4-7/8"

(147 x 280 x 124 mm)

3.7 lbs. (1.7 kg)

4 inch Cone Woofer

1 inch Balanced Dome tweeter

Color-coded push type

EXPLODED VIEWS-1

SKW-420 : POWERED SUBWOOFER

A02

MDD type
MDC type
MDT type

MPA type

A06

SP06

x 10 pcs.

A01

<Notes>

A06 (POWER SWITCH) :
MDD type
MDC type
MDT type
MPA type
MGT type
MPT type

--- No

--- No

--- No

--- Yes

--- Yes

--- Yes

HTP-420

Refer to "EXPLODED VIEWS-2"

MGT type
MPT type

A03

U03

U02

U01

A05 x 4 pcs.

A04

F903

F902

<Note>

IC501---> Refer to "PRINTED CIRCUIT BOARD PARTS LIST"

HTP-420

EXPLODED VIEWS-2

SKW-420 : POWERED SUBWOOFER

HTP-420

SP01

SP08

SP06

x 8 pcs.

SP04

SP02

x 4 pcs.

SP03

HTP-420

SP05

x 8 pcs.

EXPLODED VIEWS-3

SKF-420F / SKC-420C / SKM-420S

SP10 SP12

SP11 SP13

HTP-420

SP14

SP15

TERMINAL :
Green / Black

TERMINAL :
White / Black

TERMINAL :
Red / Black

"SKF-420F (L)" "SKF-420F (R)"

SP16

SP17 SP19

TERMINAL :
Blue / Black

TERMINAL :
Gray / Black

"SKC-420C"

SP18

HTP-420

"SKM-420S (R)""SKM-420S (L)"

BLOCK DIAGRAM

SKW-420 : POWERED SUBWOOFER

HTP-420

HTP-420

SCHEMATIC DIAGRAM

SKW-420 : POWERED SUBWOOFER

HTP-420

A

1

2

3

4

5

BCDEFGH

LINE
INPUT

OUTPUT
LEVEL

AC 120V / 60Hz
AC 220-230V / 50Hz
AC 230-240V / 50Hz

INPUT PC BOARD

U02

MAIN PC BOARD

U01

VR / LED PC BOARD

U03

LED
RED : STANDBY
GREEN : ON

<Note>

POWER SWITCH* / C1**
MDD type
MDC type
MDT type
MPA type
MGT type
MPT type

--- No

--- No

--- No

--- Yes

--- Yes

--- Yes

<Note>

C913*** / C914***
MDD type
MDC type
MDT type
MPA type
MGT type
MPT type

--- Yes

--- Yes

--- Yes

--- No

--- No

--- No

HTP-420

SPEAKER

MAIN PC BOARD

*

**

***

***

HTP-420

SCHEMATIC DIAGRAM

SKW-420 : POWERED SUBWOOFER

A

1

2

3

4

5

BCDEFGH

LINE
INPUT

OUTPUT
LEVEL

AC 120V / 60Hz
AC 220-230V / 50Hz
AC 230-240V / 50Hz

SPEAKER

INPUT PC BOARD

U02

MAIN PC BOARD

U01

VR / LED PC BOARD

U03

LED
RED : STANDBY
GREEN : ON

<Note>

POWER SWITCH* / C1**
MDD type
MDC type
MDT type
MPA type
MGT type
MPT type

--- No

--- No

--- No

--- Yes

--- Yes

--- Yes

*

**

***

***

<Note>

C913*** / C914***
MDD type
MDC type
MDT type
MPA type
MGT type
MPT type

--- Yes

--- Yes

--- Yes

--- No

--- No

--- No

PC BOARD CONNECTION DIAGRAM

SKW-420 : POWERED SUBWOOFER

INPUT PC BOARD

HTP-420

MAIN PC BOARD

VR / LED PC BOARD

POWER SWITCH

<Notes>

POWER SWITCH :
MDD type
MDC type
MDT type
MPA type
MGT type
MPT type

--- No

--- No

--- No

--- Yes

--- Yes

--- Yes

HTP-420

HTP-420

A

PRINTED CIRCUIT BOARD VIEW

SKW-420 : POWERED SUBWOOFER

MAIN PC BOARD

U01

1

2

BCD

3

4

INPUT PC BOARD

U02

5

VR / LED PC BOARD

U03

No PC board view
Look over the actual PC board on hand

®

TDA7293

120V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY

VERY HIG H OPERATI NG VOLTAGE R ANGE
(±50V)

DMOS POWER STAGE
HIGH OUTPUT POWER (100W @ THD =

10%, R

L

= 8Ω, VS = ±40V)
MUTING/STAND- BY FUNC TION S
NO SWITCH ON/OFF NOISE
VERY LOW DISTORTION
VERY LOW NOISE
SHORT CIRCUIT PROTECTED (WITH NO IN-

PUT SIGNAL APPLIED)
THERMAL SHUTDOWN
CLIP DETECTOR
MODULARITY (MORE DEVICES CAN BE

EASILY CONNECTED IN PARALLEL TO
DRIVE VERY LOW IMPEDANCES)

DESCRIPTION

The TDA7293 is a monolithic integrated circuit in
Multiwatt15 package, intended for use as audio
class AB amplifier in Hi-Fi field applications
(Home Stereo, self powered loudspeakers, Top-

Figure 1: Typical Application and Test Circuit

MULTIPOWER BCD TECHNOLOGY

Multiwatt15V Multiwatt15H

ORDERING NUMBERS:

TDA7293V TDA7293HS

class TV). Thanks to the wide voltage range and
to the high out current c apability it is able to sup­ply the highest power into both 4Ω and 8Ω loads.

The built in muting function with turn on delay
simplifies the remote operation avoiding switching
on-off noises.
Parallel mode is made possible by connecting
more device through of pin11. High out put power
can be delivered to very low impedance loads, so
optimizing the thermal dissipation of the system.

VMUTE

VSTBY

January 2003

R3 22K

C2

R2

22µF

680Ω

C1 470nF

R1 22K

R5 10K

R4 22K

C3 10µF C4 10µF

IN- 2

IN+

3

4

SGND
(**)

10

MUTE

9

STBY

(*) see Application note
(**) for SLAVE function

C7 100nF C6 1000µF

BUFFER DRIVER

11

713

-

+

MUTE

STBY

1
STBY-GND

THERMAL

SHUTDOWN

-Vs -PWVs

C9 100nF C8 1000µF

-Vs

+Vs

+PWVs+Vs

S/C

PROTECTION

158

14

12

6
5

D97AU805A

OUT

BOOT
LOADER

C5

22µF

BOOTSTRAP

CLIP DET

(*)

VCLIP

1/15

TDA7293

PIN CONNECTION (Top view)

-VS (POWER)
OUT
+V

(POWER)

S

BOOTSTRAP LOADER
BUFFER DRIVER
MUTE
STAND-BY

-V

(SIGNAL)

S

+V

(SIGNAL)

S

BOOTSTRAP
CLIP AND SHORT CIRCUIT DETECTOR
SIGNAL GROUND
NON INVERTING INPUT
INVERTING INPUT
STAND-BY GND

TAB CONNECTED TO PIN 8

15
14
13
12
11
10

9
8
7
6
5
4
3
2
1

D97AU806

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

S

V

1

V

2

- V

V

2

V

3

V

4

V

5

V

6

V

9

V

10

V

11

V

12

I

O

P

tot

T

op

, T

T

stg

Supply Voltage (No Signal)
V

STAND-BY

GND Voltage Referred to -VS (pin 8) 90 V
Input Voltage (inverting) Referred to -VS 90 V
Maximum Differential Inputs

3

Input Voltage (non inverting) Referred to -VS 90 V
Signal GND Voltage Referred to -VS 90 V
Clip Detector Voltage Referred to -VS 120 V
Bootstrap Voltage Referred to -VS 120 V
Stand-by Voltage Referred to -VS 120 V
Mute Voltage Referred to -VS 120 V
Buffer Voltage Referred to -VS 120 V
Bootstrap Loader Voltage Referred to -VS 100 V
Output Peak Current 10 A
Power Dissipation T

= 70°C50W

case

Operating Ambient Temperature Range 0 to 70
Storage and Junction Temperature 150

j

60 V

±

30 V

±

C

°

C

°

THERMAL DATA

Symbol Description

Thermal Resistance Junction-case 1 1.5

2/15

R

th j-case

Typ

Max Unit

C/W

°

TDA7293

ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit V

T

= 25°C, f = 1 kHz; unless otherwise specified).

amb

= ±40V, RL = 8Ω, Rg = 50 Ω;

S

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

V

I

OS

P

Supply Range

S

I

Quiescent Current 50 100 mA

q

Input Bias Current 0.3 1

I

b

Input Offset Voltage -10 10 mV

OS

Input Offset Current 0.2
RMS Continuous Output Power d = 1%:

O

R

= 4

VS = ± 29V,

Ω;

L

d = 10%

= 4Ω ; VS = ±29V

R

L

d Total Harmonic Distortion (**) PO = 5W; f = 1kHz

P

= 0.1 to 50W; f = 20Hz to 15kHz

O

I

Current Limiter Threshold VS ≤ ± 40V 6.5 A

SC

12

±

75 80

90 100

100

0.005

80

50 V

±

0.1

SR Slew Rate 5 10 V/µs

G
G
e

R

SVR Supply Voltage Rejection f = 100Hz; V

T

Open Loop Voltage Gain 80 dB

V

Closed Loop Voltage Gain (1) 29 30 31 dB

V

Total Input Noise A = curve

N

f = 20Hz to 20kHz

Input Resistance 100 k

i

= 0.5Vrms 75 dB

ripple

Thermal Protection DEVICE MUTED 150

S

1
310

DEVICE SHUT DOWN 160

STAND-BY FUNCTION

V
V

ATT

I

q st-by

ST on
ST off

Stand-by on Threshold 1.5 V
Stand-by off Threshold 3.5 V
Stand-by Attenuation 70 90 dB

st-by

Quiescent Current @ Stand-by 0.5 1 mA

MUTE FUNCTION

V
V

ATT

Mute on Threshold 1.5 V

Mon

Mute off Threshold 3.5 V

Moff

Mute AttenuatIon 60 80 dB

mute

(Ref: to pin 1)

(Ref: to pin 1)

CLIP DETECTOR

Duty Duty Cycle ( pin 5) THD = 1% ; RL = 10KΩ to 5V 10 %

THD = 10% ;

30 40 50 %

RL = 10KΩ to 5V

I

CLEAK

SLAVE FUNCTION pin 4

V

Slave

V

Master

Note (1):
Note:

Note (**):

SlaveThreshold 1V
Master Threshold 3 V

Vmin

G

26dB

≥

Pin 11 only for modular connection. Max external load 1MΩ/10 pF, only for test purpose

Tested with optimized Application Board (see fig. 2)

(Ref: to pin 8 -V

PO = 50W 3

)

S

A

µ

A

µ

W

W

%
%

V

µ

V

µ

Ω

C

°

C

°

A

µ

3/15

TDA7293

Figure 2: Typical Application P.C. Board and Component Layout (scale 1:1)

4/15

TDA7293

APPLICATION SUGGES TION S (see Test and Application Circuits of the Fig. 1)

The recommended values of t he external components are t hose shown on t he application circuit o f Fig­ure 1. Different values can be used; the following table can help the designer.

COMPONENTS SUGGESTED VALUE PURPOSE

LARGER THAN

SUGGESTED

R1 (*) 22k INPUT RESISTANCE INCREASE INPUT

IMPEDANCE

R2 680

Ω

CLOSED LOOP GAIN

DECREASE OF GAIN INCREASE OF GAIN

SMALLER THAN

SUGGESTED

DECREASE INPUT

IMPEDANCE

SET TO 30dB (**)

R3 (*) 22k INCREASE OF GAIN DECREASE OF GAIN

R4 22k ST-BY TIME

CONSTANT

LARGER ST-BY

ON/OFF TIME

SMALLER ST-BY

ON/OFF TIME;

POP NOISE

R5 10k MUTE TIME

CONSTANT

C1 0.47µF INPUT DC

DECOUPLING

LARGER MUTE

ON/OFF TIME

SMALLER MUTE

ON/OFF TIME
HIGHER LOW

FREQUENCY

CUTOFF

C2 22µF FEEDBACK DC

DECOUPLING

HIGHER LOW

FREQUENCY

CUTOFF

C3 10µF MUTE TIME

CONSTANT

C4 10µF ST-BY TIME

CONSTANT

LARGER MUTE

ON/OFF TIME

LARGER ST-BY

ON/OFF TIME

SMALLER MUTE

ON/OFF TIME

SMALLER ST-BY

ON/OFF TIME;

POP NOISE

C5 22µFXN (***) BOOTSTRAPPING SIGNAL

C6, C8 1000µF SUPPLY VOLTAGE

C7, C9 0.1µF SUPPLY VOLTAGE

(*) R1 = R3 for pop optimization
(**) Closed Loop Gain has to be ≥ 26dB
(***) Multiplay this value for the number of modular part connected

D98AU821

S

)

Slave function: pin 4 (Ref to pin 8 -V

+3V

-V

S

-V

+1V

S

-V

S

MASTER

UNDEFINED

SLAVE

DEGRADATION AT
LOW FREQUENCY

BYPASS

DANGER OF

BYPASS

OSCILLATION

Note:

If in the application, the speakers are connected
via long wires, it is a good rule to add between
the output and GND, a Boucherot Cell, in order to
avoid dangerous spurious oscillations when the
speakers terminal are shorted.

The suggested Boucherot Resistor is 3.9Ω/2W
and the capacitor is 1µF.

5/15

TDA7293

INTRODUCTION

In consumer electronics, an increasing demand
has arisen for very high power monolithic audio
amplifiers able to match, with a low cost, the per­formance obtained from the best discrete de­signs.

The task of realizing this linear integrated circuit
in conventional bipolar technology is made ex­tremely difficult by the occurence of 2nd break­down phoenomenon. It limits the safe operating
area (SOA) of the power devices, and, as a con­sequence, the maximum attainable output power,
especially in presence of highly reactive loads.

Moreover, full exploitation of the SOA translates
into a substantial increase in circuit and layout
complexity due to the need of sophisticated pro­tection circuits.

To overcome these substantial drawbacks, the
use of power MOS devices, which are immune
from secondary breakdown is highly desirable.

The device described has therefore been devel­oped in a mixed bipolar-MOS high voltage tech­nology called BCDII 100/120.

1) Output Stage

The main design task in developping a po wer op­erational amplifier, independently of the technol­ogy used, is that of realization of the output stage.

The solution shown as a principle shematic by
Fig3 represents the DMOS unity - gain output
buffer of the TDA7293.

This large-signal, high-power buffer must be ca­pable of handling extremely high current and volt­age levels while maintaining acceptably low har­monic distortion and good behaviour over

frequency response; moreover, an accurate con­trol of quiescent current is required.

A local linearizing feedback, provided by differen­tial amplifier A, is used to fullfil the above require­ments, allowing a simple and effective quiescent
current setting.

Proper biasing of the power output transistors
alone is however not enough to guarantee the ab­sence of crossover distortion.

While a linearization of the DC transfer charac­teristic of the stage is obtained, the dynamic be­haviour of the system must be taken into account.

A significant aid in keeping the distortion contrib­uted by the final stage as low as possible is pro­vided by the compensation scheme, which ex­ploits the direct connection of the Miller capacitor
at the amplifier’s output to introduce a local AC
feedback path enclosing the output stage itself.

2) Protections

In designing a power IC, particular attention must
be reserved to the circuits devoted to protection
of the device from short circuit or overload condi­tions.

Due to the absence of the 2nd breakdown phe­nomenon, the SOA of the power DMOS tr ansis­tors is delimited only by a maximum dissipation
curve dependent on the duration of the applied
stimulus.

In order to fully exploit the capabilities of the
power transistors, the protection scheme imple­mented in this device combines a conventional
SOA protection circuit with a novel local tempera­ture sensing technique which " dynamically" con­trols the maximum dissipation.

Figure 3: Principle Schematic of a DMOS unity-gain buffer.

6/15

Figure 4: Turn ON/OFF Suggested Sequence

+Vs

(V)

+40

-40

-Vs
V

IN

(mV)

V

ST-BY

PIN #9

(V)

5V

TDA7293

V

MUTE

PIN #10

(V)

I

Q

(mA)

V

OUT
(V)

OFF

ST-BY

5V

PLAY

MUTE MUTE

In addition to the overload protection described
above, the device features a thermal shutdown
circuit which initially puts the device into a muting
state (@ Tj = 150
Tj = 160

o

C).

o

C) and then into stand-by (@

Full protection against electrostatic discharges on
every pin is included.

Figure 5: Single Signal ST-BY/MUTE Control

Circuit

MUTE STBY

MUTE/

ST-BY

20K

10K 30K

1N4148

10µF10µF

D93AU014

3) Other Features
The device is provided with both stand-by and

ST-BY OFF

D98AU817

mute functions, independently driven by two
CMOS logic compatible input pins.

The circuits dedicated to the switching on and off
of the amplifier have been carefully optimized to
avoid any kind of uncontrolled audible transient at
the output.

The sequence that we recommend during the
ON/OFF transients is shown by Figure 4.

The application of figure 5 shows the possibility of
using only one command for both st-by and mute
functions. On both the pins, the maximum appli­cable range corresponds to the oper ating supply
voltage.

APPLICATION INFORMATION

HIGH-EFFICIENCY
Constraints of implementing high power solutions

are the power dissipation and the size of the
power supply. These are both due to the low effi­ciency of conventional AB class amplifier ap­proaches.

Here below (figure 6) is described a circuit pro­posal for a high efficiency amplifier which can be
adopted for both HI-FI and CAR-RADIO applica­tions.

7/15

TDA7293

The TDA7293 is a monolithic MOS power ampli­fier which can be operated at 100V supply voltage
(120V with no signal applied) while delivering out­put currents up to ±6.5 A.
This allows the use of this device as a very high
power amplifier (up to 180W as peak power with
T.H.D.=10 % and Rl = 4 Ohm); the only drawback
is the power dissipation, hardly manageable in
the above power range.
The typical junction-to-case thermal resistance of
the TDA7293 is 1
avoid that, in worst case conditions, the chip tem­perature exceedes 150
of the heatsink must be 0.038
bient temperature of 50

o

C/W (max= 1.5 oC/W). To

o

C, the thermal resistance

o

o

C).

C/W (@ max am-

As the above value is pratically unreachable; a
high efficiency system is needed in those cases
where the continuous RMS output power is higher
than 50-60 W.
The TDA7293 was designed to work also in
higher efficiency way.
For this reason there are four power supply pins:
two intended for the signal part and two for the
power part.
T1 and T2 are two power transistors that only
operate when the output power reaches a certain
threshold (e.g. 20 W). If the output power in­creases, these transistors are switched on during
the portion of t he signal where more output volt­age swing is needed, thus "bootstrapping" the
power supply pins (#13 and #15).

The current generators formed by T4, T7, zener
diodes Z1, Z2 and resistors R7,R8 define the
minimum drop across the power MOS transistors
of the TDA7293. L1, L2, L3 and the snubbers C9,
R1 and C10, R2 stabilize the loops formed by the
"bootstrap" circuits and the output stage of the
TDA7293.

By considering again a maximum average
output power (music signal) of 20W, in case
of the high efficiency application, the thermal
resistance value needed from the heatsink is

o

C/W (Vs =±50 V and Rl= 8 Ohm).

2.2
All components (TDA7293 and power transis­tors T1 and T2) can be placed on a 1.5

o

C/W
heatsink, with the power darlingtons electrically
insulated from the heatsink.
Since the total power dissipation is less than that
of a usual class AB amplifier, additional cost sav­ings can be obtained while optimizing the power
supply, even with a high heatsink .

BRIDGE APPLICATION

Another application suggestion is the BRIDGE
configuration, where two TDA7293 are used.
In this application, the value of the load must not
be lower than 8 Ohm for dissipation and current
capability reasons.
A suitable field of application includes HI-FI/TV
subwoofers realizations.

The main advantages offered by this solution are:

- High power performances with limited supply
voltage level.

- Considerably high output power even with high
load values (i.e. 16 Ohm).

With Rl= 8 Ohm, Vs = ±25V the maximum output
power obtainable is 150 W, while with Rl=16
Ohm, Vs = ±40V the maximum Pout is 200 W.

APPLICATION NOTE: (ref. fig. 7)
Modular Application (more Devices in Parallel)

The use of the modular application lets very high
power be delivered to very low impedance loads.
The modular application implies one device to act
as a master and the others as slaves.

The slave power stages are driven by the master
devic e and work in parallel all together, whil e the in­put and the gain s tages of the slave device are dis­abled, t he figure below shows t he connectio ns re­quired to co nfi g ure tw o dev ic es to w o rk toge the r.

The master chip connections are the same as
the normal single ones.

The outputs can be conne cted t ogether wi th-

out the need of any ballast resistance.

The slave SGND pin must be tied to the nega­tive supply.

The slave ST-BY and MUTE pins must be con­nected to the master ST-BY and MUTE pins.

The bootstrap lines must be connected to­gether and the bootstrap capacitor must be in­creased: for N devices the boostrap capacitor
must be 22µF times N.

The slave IN-pin must be connected to the
negative supply.

THE BOOTSTRAP CAPACITOR

For compatibility purpose with the previous de­vices of the family, the boostrap capacitor can be
connected both between the bootstrap pin (6) and
the output pin (14) or between the boostrap pin
(6) and the bootstrap loader pin (12).
When the bootcap is connected between pin 6
and 14, the maximum supply voltage in presence
of output signal is limited to 100V, due the boot­strap capacitor overvoltage.
When the bootcap is connected between pins 6
and 12 the maximum supply voltage extend to the
full voltage that the technology can stand: 120V.

This is accomplished by the clamp introduced at
the bootstrap loader pin (12): this pin follows the
output voltage up to 100V and remains clamped
at 100V for higher output voltages. This feature
lets the output voltage swing up to a gate-source

S

voltage from the positive supply (V

-3 to 6V).

8/15

Figure 6: High Efficiency Application Circuit

TDA7293

+50V

D6

1N4001

PLAY

ST-BY

D5

1N4148

D1 BYW98100

C12 330nF

INC7

C13 10µF

R13 20K

R14 30K

R15 10K

10µF

D2 BYW98100

R20
20K

R21
20K

+25V

GND

-25V

-50V

C1

1000µF

63V

C2

1000µF

63V

C3

100nF

C4

100nF

C5

1000µF

35V

C6

1000µF

35V

100nF

R22

10K

R23

10K

C8

100nF

C9

330nF

C10

330nF

D7

1N4001

R1

2

R2

2

Figure 6a: PCB and Component Layout of the fig. 6

C14

R12
13K

3

4

TDA7293

9

1

815

10

137

BDX53A

R17 270

L1 1µH

2

14

6

12

L2 1µH

R19 270

BDX54A

T3

BC394

T1

D3 1N4148

R3 680

R16
13K

C15

22µF

D4 1N4148

T2

T6

BC393

C11 22µF

L3 5µH

R18 270

R4
270R5270

T4

BC393

Z1 3.9V

Z2 3.9V

T7

BC394

R9
270

R6

20K

R7

3.3K

R8

3.3K

R10
270

D97AU807C

T5

BC393

1.8nF

1.8nF

T8

BC394

R11
20K

C16

C17

OUT

P

ot

9/15

TDA7293

Figure 6b: PCB - Solder Side of the fig. 6.

Figure 7: Modular Application Circuit

SGND

MUTE

STBY

C3 10µF

SGND

MUTE

STBY

IN- 2

IN+

C4 10µF

IN- 2

IN+ 3

R3 22K

3

4

10

9

4

10
9

MASTER

VMUTE

VSTBY

SLAVE

C2

22µF

R5 10K

R4 22K

680Ω

C1 470nF

R1 22K

R2

C7 100nF C6 1000µF

BUFFER

DRIVER

713

-

+

MUTE
STBY

1
STBY-GND

C7 100nF C6 1000µF

-

+

MUTE
STBY

1
STBY-GND

11

THERMAL

SHUTDOWN

-Vs -PWVs

C9 100nF C8 1000µF

-Vs

BUFFER

DRIVER

713

11

THERMAL

SHUTDOWN

-Vs -PWVs

C9 100nF C8 1000µF

-Vs

+Vs

+PWVs+Vs

S/C

PROTECTION

158

+Vs

+PWVs+Vs

S/C

PROTECTION

158

14

12

6
5

14

12

6
5

OUT

BOOT
LOADER

C5

47µF

BOOTSTRAP
CLIP DET

OUT

BOOT
LOADER

BOOTSTRAP

D97AU808D

C10

100nF

R7
2Ω

10/15

TDA7293

Figure 8a: Modular Application P.C. Board and Component Layout (scale 1:1) (Component SIDE)

Figure 8b: Modular Application P.C. Board and Component Layout (scale 1:1) (Solder SIDE)

11/15

TDA7293

Figure 9: Distortion vs Output Power

T.H.D (%)

10

5
2

1

0.5

0.2

0.1

0.05

0.02

0.01

0.005

0.002

0.001

Vs = +/-29V

Rl = 4 Ohm

f = 1KHz

210051020 50

Pout (W)

f = 20 KHz

Figure 10: Distortion vs Output Power

T.H.D (%)

10

5
2

1

0.5

0.2

0.1

0.05

0.02

0.01

0.005

0.002

0.001

Vs = +/-40V
Rl = 8 Ohm

2 10051020 50

Pou t (W)

f = 20 KHz

f = 1KHz

Figure 11: Distortion vs Frequency

T.H.D. (%)

10

1

0.1

0.01

0.001

00.1110100

VS= +/- 35 V
Rl= 8 Ohm

Pout=100 mW

Po=50 W

Frequen cy (K Hz)

Figure 12: Modular Application Derating Rload

vs Vsupply (ref. fig. 7)

6

5

4

3

2

Forbidden A rea

1

Minimum Allovable Load (ohm)

Pd > 50W at T

0

20 25 30 35 40 45 50

Supply Voltage (+/-Vcc)

case

=70°C

Figure 13: Modular Application Pd vs Vsupply

(ref. fig. 7)

60

Dissipated Power for each

50

device of the modular
application

40

4ohm

30

20

Pdissipated (W)

10

0

20 25 30 35 40 45 50

Supply Voltage (+/-Vcc)

Pd limit at Tcase=70°C

8ohm

Figure 14: Output Power vs. Supply Voltage

Po (W)

120
110
100

90
80
70
60
50
40
30
20
10

0

10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

Rl=8 Ohm
f= 1 KHz

T.H.D.=10 %

THD=0.5 %

Vs (+/-V)

12/15

TDA7293

13/15

TDA7293

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 5 0.197
B 2.65 0.104
C 1.6 0.063
E 0.49 0.55 0.019 0.022
F 0.66 0.75 0.026 0.030

G 1.14 1.27 1.4 0.045 0.050 0.055
G1 17.57 17.78 17.91 0.692 0.700 0.705
H1 19.6 0.772
H2 20.2 0.795

L 20.57 0.810

L1 18.03 0.710
L2 2.54 0.100
L3 17.25 17.5 17.75 0.679 0.689 0.699
L4 10.3 10.7 10.9 0.406 0.421 0.429
L5 5.28 0.208
L6 2.38 0.094
L7 2.65 2.9 0.104 0.114

S 1.9 2.6 0.075 0.102

S1 1.9 2.6 0.075 0.102

Dia1 3.65 3.85 0.144 0.152

mm inch

OUTLINE AND

MECHANICAL DATA

Multiwatt15 H

14/15

TDA7293

Information furnishe d is beli eved to be accu rate and reliable. However, STMicroelec tronics assumes no res ponsibility for the consequences
of use of such i nformation nor for any i nfringement of patents or ot her rights of third par ties which may result from its use. No license i s
granted by impli cation or otherwis e under any patent or patent righ ts of STMicroelect ronics. Specifica tion mentioned in this publication are
subject to change without notic e. This public ation supers edes and replaces all information prev iously supplied. STMic roelec tronic s products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

The ST logo is a registered trademark of STMicroelect roni cs

© 2003 STMicroelectronics – Printed in Italy – All Rights Reserved

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STMicroelectronics GROUP OF COMPANIES

http://www.st.com

15/15

LM124/LM224/LM324/LM2902
Low Power Quad Operational Amplifiers

LM124/LM224/LM324/LM2902 Low Power Quad Operational Amplifiers

August 2000

General Description

The LM124 series consists of four independent, high gain,
internally frequency compensated operational amplifiers
which were designed specifically to operate from a single
power supply over a wide range of voltages. Operation from
split power supplies is also possible and the low power sup­ply current drain is independent of the magnitude of the
power supply voltage.

Application areas include transducer amplifiers, DC gain
blocks and all the conventional op amp circuits which now
can be more easily implementedin single power supply sys­tems. For example, the LM124 series can be directly oper­ated off of the standard +5V power supply voltage which is
used in digital systems and will easily provide the required
interface electronics without requiring the additional
power supplies.

±

15V

Unique Characteristics

n In the linear mode the input common-mode voltage

range includes ground and the output voltage can also
swing to ground, even though operated from only a
single power supply voltage

n The unity gain cross frequency is temperature

compensated

n The input bias current is also temperature compensated

Advantages

n Eliminates need for dual supplies
n Four internally compensated op amps in a single

package

n Allows directly sensing near GND and V

to GND

n Compatible with all forms of logic
n Power drain suitable for battery operation

OUT

also goes

Features

n Internally frequency compensated for unity gain
n Large DC voltage gain 100 dB
n Wide bandwidth (unity gain) 1 MHz

(temperature compensated)

n Wide power supply range:

Single supply 3V to 32V
or dual supplies

n Very low supply current drain (700 µA)— essentially

independent of supply voltage

n Low input biasing current 45 nA

(temperature compensated)

n Low input offset voltage 2 mV

and offset current: 5 nA

n Input common-mode voltage range includes ground
n Differential input voltage range equal to the power

supply voltage

n Large output voltage swing 0V to V

±

1.5V to±16V

+

− 1.5V

Connection Diagram

Dual-In-Line Package

DS009299-1

Top View

Order Number LM124J, LM124AJ, LM124J/883 (Note 2), LM124AJ/883 (Note 1), LM224J,

LM224AJ, LM324J, LM324M, LM324MX, LM324AM, LM324AMX, LM2902M, LM2902MX, LM324N, LM324AN,

LM324MT, LM324MTX or LM2902N LM124AJRQML and LM124AJRQMLV(Note 3)

See NS Package Number J14A, M14A or N14A

Note 1: LM124A available per JM38510/11006
Note 2: LM124 available per JM38510/11005

© 2000 National Semiconductor Corporation DS009299 www.national.com

Connection Diagram (Continued)

Note 3: See STD Mil DWG 5962R99504 for Radiation Tolerant Device

LM124/LM224/LM324/LM2902

Order Number LM124AW/883, LM124AWG/883, LM124W/883 or LM124WG/883

LM124AWRQML and LM124AWRQMLV(Note 3)

LM124AWGRQML and LM124AWGRQMLV(Note 3)

Schematic Diagram (Each Amplifier)

DS009299-33

See NS Package Number W14B

See NS Package Number WG14A

www.national.com 2

DS009299-2

Absolute Maximum Ratings (Note 12)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

LM124/LM224/LM324 LM2902

Supply Voltage, V

+

Differential Input Voltage 32V 26V
Input Voltage −0.3V to +32V −0.3V to +26V
Input Current

<

(V

−0.3V) (Note 6) 50 mA 50 mA

IN

Power Dissipation (Note 4)

Molded DIP 1130 mW 1130 mW
Cavity DIP 1260 mW 1260 mW
Small Outline Package 800 mW 800 mW

Output Short-Circuit to GND

(One Amplifier) (Note 5)

+

V

≤ 15V and TA= 25˚C Continuous Continuous

Operating Temperature Range −40˚C to +85˚C

LM324/LM324A 0˚C to +70˚C
LM224/LM224A −25˚C to +85˚C

LM124/LM124A −55˚C to +125˚C
Storage Temperature Range −65˚C to +150˚C −65˚C to +150˚C
Lead Temperature (Soldering, 10 seconds) 260˚C 260˚C
Soldering Information

Dual-In-Line Package

Soldering (10 seconds) 260˚C 260˚C

Small Outline Package

Vapor Phase (60 seconds) 215˚C 215˚C
Infrared (15 seconds) 220˚C 220˚C

See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface mount
devices.

ESD Tolerance (Note 13) 250V 250V

LM124A/LM224A/LM324A

32V 26V

LM124/LM224/LM324/LM2902

Electrical Characteristics

V+= +5.0V, (Note 7), unless otherwise stated

Parameter Conditions

Input Offset Voltage (Note 8) T
Input Bias Current I
(Note 9) T
Input Offset Current I

Input Common-Mode V
Voltage Range (Note 10) T
Supply Current Over Full Temperature Range

Large Signal V
Voltage Gain (V
Common-Mode DC, V
Rejection Ratio T

IN(+)

IN(+)

T

R
V
V

A

A
+

A

L

+
+
+

O

A

= 25˚C 1 2 1 3 2 3 mV

A

or I

IN(−),VCM

= 25˚C

or I

IN(−),VCM

= 25˚C
= 30V, (LM2902, V+= 26V), 0 V+−1.5 0 V+−1.5 0 V+−1.5 V
= 25˚C

=∞On All Op Amps mA
= 30V (LM2902 V+= 26V) 1.5 3 1.5 3 1.5 3
= 5V 0.7 1.2 0.7 1.2 0.7 1.2
= 15V, RL≥ 2kΩ, 50 100 50 100 25 100 V/mV

= 1V to 11V), TA= 25˚C

CM

= 25˚C

= 0V,

= 0V, 2 10 2 15 5 30 nA

=0VtoV+− 1.5V, 70 85 70 85 65 85 dB

LM124A LM224A LM324A

Min Typ Max Min Typ Max Min Typ Max

20 50 40 80 45 100 nA

www.national.com3

Units

Electrical Characteristics (Continued)

V+= +5.0V, (Note 7), unless otherwise stated

Parameter Conditions

Power Supply V
Rejection Ratio (LM2902, V

Amplifier-to-Amplifier f = 1 kHz to 20 kHz, T

+

=5Vto30V

T

= 25˚C

A

+

= 5V to 26V), 65 100 65 100 65 100 dB

= 25˚C −120 −120 −120 dB

A

Coupling (Note 11) (Input Referred)
Output Current Source V

LM124/LM224/LM324/LM2902

Sink V

+

IN
+

= 15V, VO= 2V, TA= 25˚C mA

V

−

IN
+

V

= 15V, VO= 2V, TA= 25˚C

−

V

IN
+

= 15V, VO= 200 mV, TA= 25˚C

V

Short Circuit to Ground (Note 5) V

−

= 1V, V

= 1V, V

= 1V, V

= 0V, 20 40 20 40 20 40

IN

+

= 0V, 10 20 10 20 10 20

IN

+

= 0V, 12 50 12 50 12 50 µA

IN

+

= 15V, TA= 25˚C 40 60 40 60 40 60 mA

Input Offset Voltage (Note 8) 4 4 5 mV

Drift RS=0Ω 7 20 7 20 7 30 µV/˚C

V

OS

Input Offset Current I

Drift RS=0Ω 10 200 10 200 10 300 pA/˚C

I

OS

Input Bias Current I
Input Common-Mode V

IN(+)−IIN(−),VCM

or I

IN(+)

IN(−)

+

= +30V 0 V+−2 0 V+−2 0 V+−2 V

Voltage Range (Note 10) (LM2902, V

+

Large Signal V
Voltage Gain R
Output Voltage V

OH

= +15V (VOSwing = 1V to 11V)
≥ 2kΩ 25 25 15 V/mV

L

V+= 30V RL=2kΩ 26 26 26 V

Swing (LM2902, V

V

Output Current Source V

V+= 5V, RL=10kΩ 520 520 520mV

OL

=2V V

O

Sink V

=0V 303075nA

+

= 26V)

+

= 26V) RL=10kΩ 27 28 27 28 27 28

+

= +1V, 10 20 10 20 10 20

IN

−

= 0V,

V

IN

V+= 15V

−

= +1V, 10 15 5 8 5 8

IN

+

= 0V,

V

IN

V+= 15V

LM124A LM224A LM324A

Min Typ Max Min Typ Max Min Typ Max

40 100 40 100 40 200 nA

Units

mA

Electrical Characteristics

V+= +5.0V, (Note 7), unless otherwise stated

Parameter Conditions

Input Offset Voltage (Note 8) T
Input Bias Current I
(Note 9) T
Input Offset Current I

Input Common-Mode V
Voltage Range (Note 10) T

T

IN(+)

A

IN(+)

A
+

A

Supply Current Over Full Temperature Range

R

L

+

V

+

V
Large Signal V
Voltage Gain (V

+

O

Common-Mode DC, V
Rejection Ratio T
Power Supply V

A
+

Rejection Ratio (LM2902, V

www.national.com 4

= 25˚C 2 5 2 7 2 7 mV

A

or I

IN(−),VCM

= 0V,

= 25˚C

or I

IN(−),VCM

= 0V, 3 30 5 50 5 50 nA
= 25˚C
= 30V, (LM2902, V+= 26V), 0 V+−1.5 0 V+−1.5 0 V+−1.5 V
= 25˚C

=∞On All Op Amps mA
= 30V (LM2902 V+= 26V) 1.5 3 1.5 3 1.5 3
= 5V 0.7 1.2 0.7 1.2 0.7 1.2
= 15V, RL≥ 2kΩ, 50 100 25 100 25 100 V/mV

= 1V to 11V), TA= 25˚C

=0VtoV+− 1.5V, 70 85 65 85 50 70 dB

CM

= 25˚C
=5Vto30V

+

= 5V to 26V), 65 100 65 100 50 100 dB

LM124/LM224 LM324 LM2902

Min Typ Max Min Typ Max Min Typ Max

45 150 45 250 45 250 nA

Units

Electrical Characteristics (Continued)

V+= +5.0V, (Note 7), unless otherwise stated

Parameter Conditions

T

= 25˚C

A

Amplifier-to-Amplifier f = 1 kHz to 20 kHz, T

= 25˚C −120 −120 −120 dB

A

Coupling (Note 11) (Input Referred)
Output Current Source V

Sink V

+

IN
+

= 15V, VO= 2V, TA= 25˚C mA

V

−

IN
+

= 15V, VO= 2V, TA= 25˚C

V

−

V

IN
+

V

= 15V, VO= 200 mV, TA= 25˚C

Short Circuit to Ground (Note 5) V

−

= 1V, V

= 1V, V

= 1V, V

= 0V, 20 40 20 40 20 40

IN

+

= 0V, 10 20 10 20 10 20

IN

+

= 0V, 12 50 12 50 12 50 µA

IN

+

= 15V, TA= 25˚C 40 60 40 60 40 60 mA

Input Offset Voltage (Note 8) 7 9 10 mV

Drift RS=0Ω 7 7 7 µV/˚C

V

OS

Input Offset Current I

Drift RS=0Ω 10 10 10 pA/˚C

I

OS

Input Bias Current I
Input Common-Mode V

IN(+)−IIN(−),VCM

or I

IN(+)

IN(−)

+

= +30V 0 V+−2 0 V+−2 0 V+−2 V
Voltage Range (Note 10) (LM2902, V
Large Signal V
Voltage Gain R
Output Voltage V

OH

+

= +15V (VOSwing = 1V to 11V)

≥ 2kΩ 25 15 15 V/mV

L

V+= 30V RL=2kΩ 26 26 22 V

Swing (LM2902, V

V

OL

Output Current Source V

V+= 5V, RL=10kΩ 5 20 5 20 5 100 mV

=2V V

O

Sink V

= 0V 100 150 45 200 nA

+

= 26V)

+

= 26V) RL=10kΩ 27 28 27 28 23 24

+

= +1V, 10 20 10 20 10 20

IN

−

V

= 0V,

IN

V+= 15V

−

= +1V, 5 8 5 8 5 8

IN

+

= 0V,

V

IN
+

V

= 15V

Note 4: For operating at high temperatures, the LM324/LM324A/LM2902 must be derated based on a +125˚C maximum junction temperature and a thermal resis­tance of 88˚C/W which applies for the device soldered in a printed circuit board, operating in a still air ambient. The LM224/LM224A and LM124/LM124A can be de­rated based on a +150˚C maximum junction temperature. The dissipation is the total of all four amplifiers — use external resistors, where possible, to allow the am­plifier to saturate of to reduce the power which is dissipated in the integrated circuit.

+

Note 5: Short circuits from the output to V
current is approximately 40 mA independent of the magnitude of V

can cause excessive heating and eventual destruction. When considering short circuits to ground, the maximum output

+

. At values of supply voltage in excess of +15V, continuous short-circuits can exceed the power

dissipation ratings and cause eventual destruction. Destructive dissipation can result from simultaneous shorts on all amplifiers.
Note 6: This input current will only exist when the voltage at any of the input leads is driven negative. It is due to the collector-base junction of the input PNP tran-

sistors becoming forward biased and thereby acting as input diode clamps. In addition to this diode action, there is also lateral NPN parasitic transistor action on the
IC chip. This transistor action can cause the output voltages of the op amps to go to the V
an input is driven negative. This is not destructive and normal output states will re-establish when the input voltage, which was negative, again returns to a value
greater than −0.3V (at 25˚C).

Note 7: These specifications are limited to −55˚C ≤ T

≤ +85˚C, the LM324/LM324A temperature specifications are limited to 0˚C ≤ TA≤ +70˚C, and the LM2902 specifications are limited to −40˚C ≤ TA≤ +85˚C.

≤ T

A

Note 8: V

. 1.4V, RS=0Ωwith V+from 5V to 30V; and over the full input common-mode range (0V to V+− 1.5V) for LM2902, V+from 5V to 26V.

O

≤ +125˚C for the LM124/LM124A. With the LM224/LM224A, all temperature specifications are limited to −25˚C

A

Note 9: The direction of the input current is out of the IC due to the PNP input stage. This current is essentially constant, independent of the state of the outputso
no loading change exists on the input lines.

Note 10: The input common-mode voltage of either input signal voltage should not be allowed to go negative by more than 0.3V (at 25˚C). The upper end of the
common-mode voltage range is V

+

.

V

+

− 1.5V (at 25˚C), but either or both inputs can go to +32V without damage (+26V for LM2902), independent of the magnitude of

Note 11: Due to proximity of external components, insure that coupling is not originating via stray capacitance between these external parts. This typically can be
detected as this type of capacitance increases at higher frequencies.

Note 12: Refer to RETS124AX for LM124A military specifications and refer to RETS124X for LM124 military specifications.
Note 13: Human body model, 1.5 kΩ in series with 100 pF.

LM124/LM224 LM324 LM2902

Min Typ Max Min Typ Max Min Typ Max

40 300 40 500 40 500 nA

+

voltage level (or to ground for a large overdrive) for the time duration that

Units

mA

LM124/LM224/LM324/LM2902

www.national.com5

Typical Performance Characteristics

Input Voltage Range

LM124/LM224/LM324/LM2902

Supply Current

DS009299-34

Input Current

DS009299-35

Voltage Gain

Open Loop Frequency
Response

DS009299-36

DS009299-37

Common Mode Rejection
Ratio

DS009299-38

DS009299-39

www.national.com 6

Typical Performance Characteristics (Continued)

LM124/LM224/LM324/LM2902

Voltage Follower Pulse
Response

Large Signal Frequency
Response

DS009299-40

Voltage Follower Pulse
Response (Small Signal)

DS009299-41

Output Characteristics
Current Sourcing

Output Characteristics
Current Sinking

DS009299-42

DS009299-44

DS009299-43

Current Limiting

DS009299-45

www.national.com7

Typical Performance Characteristics (Continued)

Input Current (LM2902 only)

LM124/LM224/LM324/LM2902

DS009299-46

Application Hints

The LM124 series are op amps which operate with only a
single power supply voltage, have true-differential inputs,
and remain in the linear mode with an input common-mode
voltage of 0 V
of power supply voltage with little change in performance
characteristics. At 25˚C amplifier operation is possible down
to a minimum supply voltage of 2.3 V

The pinouts of the package have been designed to simplify
PC board layouts. Inverting inputs are adjacent to outputs for
all of the amplifiers and the outputs have also been placed at
the corners of the package (pins 1, 7, 8, and 14).

Precautions should be taken to insure that the power supply
for the integrated circuit never becomes reversed in polarity
or that the unit is not inadvertently installed backwards in a
test socket as an unlimited current surge through the result­ing forward diode within the IC could cause fusing of the in­ternal conductors and result in a destroyed unit.

Large differential input voltages can be easily accommo­dated and, as input differential voltage protection diodes are
not needed, no large input currents result from large differen­tial input voltages. The differential input voltage may be
larger than V
should be provided to prevent the input voltages from going
negative more than −0.3 V
with a resistor to the IC input terminal can be used.

To reduce the power supply drain, the amplifiers have a
class A output stage for small signal levels which converts to
class B in a large signal mode. This allows the amplifiers to
both source and sink large output currents. Therefore both
NPN and PNP external current boost transistors can be used
to extend the power capability of the basic amplifiers. The
output voltage needs to raise approximately 1 diode drop
above ground to bias the on-chip vertical PNP transistor for
output current sinking applications.

For ac applications, where the load is capacitively coupled to
the output of the amplifier, a resistor should be used, from
the output of the amplifier to ground to increase the class A
bias current and prevent crossover distortion.

. These amplifiers operate over a wide range

DC

.

DC

+

without damaging the device. Protection

(at 25˚C). An input clamp diode

DC

Voltage Gain (LM2902 only)

DS009299-47

Where the load is directly coupled, as in dc applications,
there is no crossover distortion.

Capacitive loads which are applied directly to the output of
the amplifier reduce the loop stability margin. Values of
50 pF can be accommodated using the worst-case
non-inverting unity gain connection. Large closed loop gains
or resistive isolation should be used if larger load capaci­tance must be driven by the amplifier.

The bias network of the LM124 establishes a drain current
which is independent of the magnitude of the power supply
voltage over the range of from 3 V

to 30 VDC.

DC

Output short circuits either to ground or to the positive power
supply should be of short time duration. Units can be de­stroyed, not as a result of the short circuit current causing
metal fusing, but rather due to the large increase in IC chip
dissipation which will cause eventual failure due to exces­sive junction temperatures. Putting direct short-circuits on
more than one amplifier at a time will increase the total IC
power dissipation to destructive levels, if not properly pro­tected with external dissipation limiting resistors in series
with the output leads of the amplifiers. The larger value of
output source current which is available at 25˚C provides a
larger output current capability at elevated temperatures
(see typical performance characteristics) than a standard IC
op amp.

The circuits presented in the section on typical applications
emphasize operation on only a single power supply voltage.
If complementary power supplies are available, all of the
standard op amp circuits can be used. In general, introduc­ing a pseudo-ground (a bias voltage reference of V
allow operation above and below this value in single power
supply systems. Many application circuits are shown which
take advantage of the wide input common-mode voltage
range which includes ground. In most cases, input biasing is
not required and input voltages which range to ground can
easily be accommodated.

+

/2) will

www.national.com 8

LM124/LM224/LM324/LM2902

Typical Single-Supply Applications (V

Non-Inverting DC Gain (0V Input = 0V Output)

*

R not needed due to temperature independent I

DC Summing Amplifier

(V

≥ 0VDCand VO≥ VDC)

IN’S

IN

+

= 5.0 VDC)

DS009299-5

Power Amplifier

Where: V0=V1+V2−V3−V

(V1+V2)≥(V3+V4) to keep V

DS009299-7

DS009299-6

4

>

0V

O

DC

V0=0VDCfor VIN=0V

AV=10

DC

www.national.com9

Typical Single-Supply Applications (V

+

= 5.0 VDC) (Continued)

LED Driver

LM124/LM224/LM324/LM2902

DS009299-8

fo= 1 kHz
Q=50

= 100 (40 dB)

A

V

“BI-QUAD” RC Active Bandpass Filter

DS009299-9

Fixed Current Sources

Lamp Driver

DS009299-11

DS009299-10

www.national.com 10

Typical Single-Supply Applications (V

Current Monitor

DS009299-12

+

= 5.0 VDC) (Continued)

LM124/LM224/LM324/LM2902

Driving TTL

DS009299-13

*

(Increase R1 for ILsmall)

Voltage Follower

Pulse Generator

DS009299-14

DS009299-15

www.national.com11

Typical Single-Supply Applications (V

+

= 5.0 VDC) (Continued)

Squarewave Oscillator

LM124/LM224/LM324/LM2902

Pulse Generator

DS009299-16

DS009299-17

High Compliance Current Sink

IO= 1 amp/volt V
(Increase REfor Iosmall)

IN

DS009299-18

www.national.com 12

Typical Single-Supply Applications (V

Low Drift Peak Detector

+

= 5.0 VDC) (Continued)

LM124/LM224/LM324/LM2902

Comparator with Hysteresis

DS009299-20

DS009299-19

Ground Referencing a Differential Input Signal

VO=V

R

DS009299-21

www.national.com13

Typical Single-Supply Applications (V

Voltage Controlled Oscillator Circuit

LM124/LM224/LM324/LM2902

*

Wide control voltage range: 0 VDC≤ VC≤ 2(V+−1.5 VDC)

Photo Voltaic-Cell Amplifier

+

= 5.0 VDC) (Continued)

DS009299-22

AC Coupled Inverting Amplifier

www.national.com 14

DS009299-23

DS009299-24

Typical Single-Supply Applications (V

AC Coupled Non-Inverting Amplifier

+

= 5.0 VDC) (Continued)

LM124/LM224/LM324/LM2902

DS009299-25

fO= 1 kHz
Q=1

=2

A

V

DC Coupled Low-Pass RC Active Filter

DS009299-26

www.national.com15

Typical Single-Supply Applications (V

High Input Z, DC Differential Amplifier

LM124/LM224/LM324/LM2902

High Input Z Adjustable-Gain
DC Instrumentation Amplifier

+

= 5.0 VDC) (Continued)

DS009299-27

www.national.com 16

DS009299-28

Typical Single-Supply Applications (V

+

= 5.0 VDC) (Continued)

LM124/LM224/LM324/LM2902

Using Symmetrical Amplifiers to

Reduce Input Current (General Concept)

Bridge Current Amplifier

DS009299-30

DS009299-29

fO= 1 kHz
Q=25

Bandpass Active Filter

DS009299-31

www.national.com17

Physical Dimensions inches (millimeters) unless otherwise noted

LM124/LM224/LM324/LM2902

Ceramic Dual-In-Line Package (J)

Order Number JL124ABCA, JL124BCA, JL124ASCA, JL124SCA, LM124J,

LM124AJ, LM124AJ/883, LM124J/883, LM224J, LM224AJ or LM324J

NS Package Number J14A

MX S.O. Package (M)

Order Number LM324M, LM324MX, LM324AM, LM324AMX, LM2902M or LM2902MX

NS Package Number M14A

www.national.com 18

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

LM124/LM224/LM324/LM2902

Molded Dual-In-Line Package (N)

Order Number LM324N, LM324AN or LM2902N

NS Package Number N14A

Ceramic Flatpak Package

Order Number JL124ABDA, JL124ABZA, JL124ASDA, JL124BDA, JL124BZA,

JL124SDA, LM124AW/883, LM124AWG/883, LM124W/883 or LM124WG/883

NS Package Number W14B

www.national.com19

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

14-Pin TSSOP

Order NumberLM324MT or LM324MTX

NS Package Number MTC14

LM124/LM224/LM324/LM2902 Low Power Quad Operational Amplifiers

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the

2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.

labeling, can be reasonably expected to result in a
significant injury to the user.

National Semiconductor
Corporation

Americas
Tel: [phone]
Fax: [phone]
Email: [e-mail]

www.national.com

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

National Semiconductor
Europe

Fax: [phone]

Email: [e-mail]
Deutsch Tel: [phone]
English Tel: [phone]
Français Tel: [phone]

National Semiconductor
Asia Pacific Customer
Response Group

Tel: [phone]
Fax: [phone]
Email: [e-mail]

National Semiconductor
Japan Ltd.

Tel: [phone]
Fax: [phone]

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1/2PAGE

HTP-420

EXPLODED VIEW PARTS LIS

<Notes>
(B) : Black model

NOTE : THE COMPONENTS IDENTIFIED BY THE MARK

! ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE ONLY WITH PART
NUMBER SPECIFIED.

REF. NO. PART NAME DESCRIPTION Q'TY PART NO. (SN) MARK

SKW-420 (B) / (S) : POWERED SUBWOOFER

SP01 CABINET ASS'Y (B) Black 1 ANW8W670BBM10 <MDD>
SP01 CABINET ASS'Y (B) Black 1 ANW8W670BBM10 <MDC>
SP01 CABINET ASS'Y (B) Black 1 ANW8W670BBM30 <MPA>
SP01 CABINET ASS'Y (S) Silver 1 ANW8W670SBM10 <MDD>
SP01 CABINET ASS'Y (S) Silver 1 ANW8W670SBM10 <MDC>
SP01 CABINET ASS'Y (S) Silver 1 ANW8W670SBM10 <MDT>
SP01 CABINET ASS'Y (S) Silver 1 ANW8W670SBM30 <MPA>
SP01 CABINET ASS'Y (S) Silver 1 ANW8W670SBM40 <MGT>
SP01 CABINET ASS'Y (S) Silver 1 ANW8W670SBM60 <MPT>
SP02 FOOT D87.5 x D37.5 x H50 HIPS BLK 4 BPE8000040001
SP03 BOTTOM BOARD F2905-GW 1 ANF860002BM10 (B)
SP03 BOTTOM BOARD F2905-GW 1 ANF860003BM10 (S)
SP04 FRONT PLATE SKW-420 / ONKYO NAME PLATE 1 BPL8001470001
SP05 WOOD SCREW 8 x 4 x L75 (FOR FOOT) 8 NST8550514750
SP06 WOOD SCREW 4STT+20A (FOR AMPLIFIER / SP) 18 837440204
SP08 WOOFER SPEAKER 20cm 4ohm 50W 1 W20178A

A01 REAR PANEL "SKW-420" SPCC 190 x 120 x T2.0mm 1 GSE4001750001 <MDD>
A01 REAR PANEL "SKW-420" SPCC 190 x 120 x T2.0mm 1 GSE4001750001 <MDC>
A01 REAR PANEL "SKW-420" SPCC 190 x 120 x T2.0mm 1 GSE4001750001 <MDT>
A01 REAR PANEL "SKW-420" SPCC 190 x 120 x T2.0mm 1 GSE4001750004 <MPA>
A01 REAR PANEL "SKW-420" SPCC 190 x 120 x T2.0mm 1 GSE4001750003 <MGT>
A01 REAR PANEL "SKW-420" SPCC 190 x 120 x T2.0mm 1 GSE4001750004 <MPT>
A02 AC CORD LINE CORD 2P 1800mm BLK POLARIZE 1 VPA0040120010 ! <MDD>
A02 AC CORD LINE CORD 2P 1800mm BLK POLARIZE 1 VPA0040120010 ! <MDC>
A02 AC CORD LINE CORD 2P 1800mm BLK POLARIZE 1 VPA0040120010 ! <MDT>
A02 AC CORD LINE CORD 2P 1980mm BLK SAA 1 VPE0010140010 ! <MPA>
A02 AC CORD LINE CORD 2P 1980mm BLK VDE 1 VPE003012-0020 ! <MGT>
A02 AC CORD LINE CORD 2P 1980mm BLK VDE 1 VPE003012-0020 ! <MPT>
A03 BUSHING AC LINE BUSHING 1 DBU001002-0011
A04 POWER TRANSFORMER AC120V / 60Hz 100W 1 TTI1120010120 ! <MDD>
A04 POWER TRANSFORMER AC120V / 60Hz 100W 1 TTI1120010120 ! <MDC>
A04 POWER TRANSFORMER AC120V / 60Hz 100W 1 TTI1120010120 ! <MDT>
A04 POWER TRANSFORMER AC230 / 240V / 50Hz 100W 1 TTI4234100010 ! <MPA>
A04 POWER TRANSFORMER AC220 / 230V / 50Hz 100W 1 TTI4223100010 ! <MGT>
A04 POWER TRANSFORMER AC230 / 240V / 50Hz 100W 1 TTI4234100010 ! <MPT>
A05 SCREW M4.0 x P0.7 x L25mm (FOR TRANS) 4 HSD1431033250
A06 POWER SWITCH ROCKER 5A AC 250V TV-5 1 MSW0080040010 ! <MPA>

(S) : Silver model
<MDD> : American model
<MDC> : Canadian model
<MDT> : Asian model (120V)
<MPA> : Australian model
<MGT> : Asian model (220-230V)
<MPT> : Asian model (230-240V)

!

2/2PAGE

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A06 POWER SWITCH ROCKER 5A AC 250V TV-5 1 MSW0080040010 ! <MGT>

A06 POWER SWITCH ROCKER 5A AC 250V TV-5 1 MSW0080040010 ! <MPT>
F902, F903 FUSE 4A / 250V SLOW WALT 2 KSA0204000011 ! <MDD>
F902, F903 FUSE 4A / 250V SLOW WALT 2 KSA0204000011 ! <MDC>
F902, F903 FUSE 4A / 250V SLOW WALT 2 KSA0204000011 ! <MDT>
F902, F903 FUSE 4A / 250V SLOW 5ST 2 KSA0204000020 ! <MPA>
F902, F903 FUSE 4A / 250V SLOW 5ST 2 KSA0204000020 ! <MGT>
F902, F903 FUSE 4A / 250V SLOW 5ST 2 KSA0204000020 ! <MPT>

U01 MAIN PC BOARD ASS'Y MAIN PC BOARD ASS'Y 1 APE4012115001

<Note>
U01 : MAIN PC BOARD ASS'Y = PCB BRACKET + HEAT SINK + ALL PARTS FOR MAIN PC BOARD

U02 INPUT PC BOARD ASS'Y INPUT PC BOARD ASS'Y 1 APE4012125001

<Note>
U02 : INPUT PC BOARD ASS'Y = INPUT PC BOARD with RCA JACK + CORD ASS'Y

U03 VR / LED PC BOARD ASS'Y VR / LED PC BOARD ASS'Y 1 APE4012135001

<Note>
U03 : VR/ LED PC BOARD ASS'Y = VR / LED PC BOARD with VR / LED / CORD ASS'Y etc.

SKF-420F (B) : FRONT SPEAKERS L / R

SP10 COMPLETE UNIT "SKF-420F (B) L" 1 ANM8S670BBM10 (B)
SP11 BACK LABEL (L) --- 1 YLB810004FL10 (B)
SP12 COMPLETE UNIT "SKF-420F (B) R" 1 ANM8S670BBM11 (B)
SP13 BACK LABEL (R) --- 1 YLB810004FR10 (B)

SKF-420F (S) : FRONT SPEAKERS L / R

SP10 COMPLETE UNIT "SKF-420F (S) L" 1 ANM8S670SBM10 (S)
SP11 BACK LABEL (L) --- 1 YLB810004FL10 (S)
SP12 COMPLETE UNIT "SKF-420F (S) R" 1 ANM8S670SBM11 (S)
SP13 BACK LABEL (R) --- 1 YLB810004FR10 (S)

SKC-420C (B) : CENTER SPEAKER

SP14 COMPLETE UNIT "SKC-420C (B)" 1 ANC8S670BBM10 (B)
SP15 BACK LABEL --- 1 YLB810004C010 (B)

SKC-420C (S) : CENTER SPEAKER

SP14 COMPLETE UNIT "SKC-420C (S)" 1 ANC8S670SBM10 (S)
SP15 BACK LABEL --- 1 YLB810004C010 (S)

SKM-420S (B) : SURROUND SPEAKERS L / R

SP16 COMPLETE UNIT "SKM-420S (B) L" 1 ANU8S670BBM10 (B)
SP17 BACK LABEL (L) --- 1 YLB810004SL10 (B)
SP18 COMPLETE UNIT "SKM-420S (B) R" 1 ANU8S670BBM11 (B)
SP19 BACK LABEL (R) --- 1 YLB810004SR10 (B)

SKM-420S (S) : SURROUND SPEAKERS L / R

SP16 COMPLETE UNIT "SKM-420S (S) L" 1 ANU8S670SBM10 (S)
SP17 BACK LABEL (L) --- 1 YLB810004SL10 (S)
SP18 COMPLETE UNIT "SKM-420S (S) R" 1 ANU8S670SBM11 (S)
SP19 BACK LABEL (R) --- 1 YLB810004SR10 (S)

HTP-420

PRINTED CIRCUIT BOARD PARTS LIS

CIRCUIT NO.PART NAME DESCRIPTION Q'TY PART NO. (SN) MARK

PWB
PWB

IC501 POWER IC 15PIN TDA7293 1 RHI007293-0001

DB901 DIODE RS402L 4A 100V 1 RHD2040100011

!

HTP-420

ONKYO CORPORATION

Sales & Product Planning Div. : 2-1, Nisshin-cho, Neyagawa-shi, OSAKA 572-8540, JAPAN
Tel: [phone] Fax: [phone]

ONKYO U.S.A. CORPORATION

18 Park Way, Upper Saddle River, N.J. 07458, U.S.A.
Tel: [phone] Fax: [phone] http://www.onkyousa.com

ONKYO EUROPE ELECTRONICS GmbH

Liegnitzerstrasse 6, 82194 Groebenzell, GERMANY
Tel: [phone] Fax: [phone] http://www.onkyo.net

ONKYO CHINA LIMITED

Units 2102-2107, Metroplaza Tower I, 223 Hing Fong Road, Kwai Chung,
N.T., HONG KONG Tel: [phone] Fax: [phone]

HOMEPAG

http://www.onkyo.com/

E