Datasheet AN5270 Datasheet (Panasonic)

ICs for Audio Common Use

AN5270

4.3 W × 1(8Ω) Power Amplifier with Volume Control and Tone Control

■ Overview

The AN5720 is an integrated circuit designed for 4.3 W(8
Ω) power amplifier with volume control and tone control.

■ Features

• DC volume control : 0 to 5 V

• DC tone control : 0 to 5 V

• 9-lead single-in-line plastic package with fin

■ Block Diagram

Pre

amp.

Volume

control

Tone

control

19.9±0.1

18.3±0.25

φ2.65±0.1

φ3.3±0.1

0.1±0.05

8.4±0.25

5.8±0.25

1.5±0.25

5.6±0.25

6.3 7.1
±0.3 ±0.25

9
8
7
6
5
4

15.0

3
2
1

HSIP009-P-0000

Unit : mm

3.75±0.25

±0.1

0.5

1.2

2.54

+0.1

–0.05

1.7±0.25

0.45

±0.25

1.7

±0.25

22.3±0.3

1

V

CC1

2

In

3

LF

4

Vol-ctl.

5

Tone-ctl.

6

RF

■ Pin Descriptions

Pin No. Pin Name

1V
2 Sound input
3 Low frequency input
4 Volume control
5 Tone control
6 Ripple filter
7 Ground
8 Sound output
9V

Note) Pins 2 and 4 are weaker in protection against positive surge than the other pins.

It is necessary to pay attention during application use.

CC1

CC2

7

GND

8

Out

9

CC2

V

1

AN5270 ICs for Audio Common Use

■ Absolute Maximum Ratings

Parameter Symbol Ratings Unit

Supply voltage V

V

Circuit voltage V

Supply current I

3, 4

Circuit current
Power dissipation
Operating ambient temperature
Storage temperature

Note) Do not apply a current or voltage from the external to the terminals that are not described above.

*1:Ta = 25 °C, excluding parameters regarding ambient temperature and storage temperature.
*2:Ta = 70 °C, the IC is mounted on PCB, without external heat sink.
*3: For circuit currents, '+' denotes current flowing into the IC, and '−' denotes current flowing out of the IC.
*4: As the output Pin8 does not have over current protection circuit incorporated,

*

2

*

1

*

1

*

therefore please take precaution not to short the output pin to either VCC or GND.

)14 V

CC1(V1-7

)26

CC2(V9-7

2-7

V

3-7

V

4-7

V

5-7

CC1

I

CC2

I

8

P

D

T

opr

T

stg

0 to V

9-7

0 to V

9-7

0 to V

1-7

0 to V

1-7

15 mA

2A

−1.7 to +1.7 A

PP

1.6 W

−20 to +70 °C

−55 to +150 °C

■ Recommended Operating Range

Parameter Symbol Range Unit

Operating supply voltage range V

CC1

V

CC2

11 to 13 V
15 to 24

2

ICs for Audio Common Use AN5270

■ Electrical Caracteristics at V

= 12 V, V

CC1

= 18 V, f = 1 kHz, Ta = 25 °C, RL = 8 Ω, Vol. = max.,

CC2

Tone = max.

Parameter Symbol Conditions Min Typ Max Unit

Quiescent current 1 I

Quiescent current 2 I

TOT1

TOT2

Output DC bias V

Voltage gain G
Total harmonic distortion THD VO = 1 V
Max. output power Pomax THD = 10 %, PO = V
Max. output attenuation Attmax V

Tone variable range ∆G

No input signal 7 10 13 mA
Measure V

CC1

current

No input signal 20 28 48 mA
Measure V

No input signal 7.2 8.3 9.4 V

ODC

CC2

current

Measure Pin8 DC

V

VO = 1 V

= 1.0 V

O

, GV = 20 log(VO / VIN) 283032dB

rms

, BPF : 400 Hz to 30 kHz  0.5 1.0 %

rms

, Vol. = max. → min. −69 −66 dB

rms

Attmax = 20 log [V
f = 10 kHz, fix VIN where 18 20  dB

TC

V

O(tone = max.)

= 1 V
Tone = max. → min.
∆GTC = 20 log [V

2

/ R

O

O(vol. = max.)

rms

O(tone = max.)

L

/ V

/ V

O(tone = min.)

O(vol. = min.)

4.0 4.3  W

]

]

■ Application Circuit Example

AN5270

6

1In2LF3

5.1kΩ

CC1

100Ω

33µF

Ext

External
audio in

SIF-IC

Det.
out

33µF

Note) Design considerations for shock noise prevention. :

In the application of the IC, please adopt the above power supply configuration whenever possible.
Where this is not possible, then it is better to ensure that V
power-on shock noise. Similarly, please ensure that V

100kΩ

1kΩ

TV

AV

SW

33µF

9kΩ

33µF

24kΩ

V

3.3µF

30kΩ

4

5

Vol-ctl.

0.039
µF

22µF

CC2

Tone-ctl.

33kΩ

should start up first before the onset of V

CC1

declines faster than V

7

RF

GND

47µF

5V

10kΩ
VR

10kΩ
VR

, in order to prevent power-off shock noise.

CC1

Out 8

470
µF

8Ω

AN78M05

100µF

9

GND

12V

47µF

CC2

V

2200µF

, in order to prevent

CC2

AN78M12

18V
Power
supply

3

AN5270 ICs for Audio Common Use

■ Technical Information

• Characteristic curve chart

 T

P

D

2.63

1.6

6.65

a

P

<

max

11

4

10.4
10

9

)

8

W

(

D

7
6
5

3

4.14

4

2

3.36

3

1

Power dissipation P

2.5
2

2.15

0

0120 160

40 60 80 100 120 140

Ambient temperature Ta (°C)

1 No heat sink
2 5.5 × 5.0 cm2 Al board

(t = 1 mm)

3 7.5 × 7.5 cm2 Al board

(t = 1 mm)

4 Infinity heat sink

T

− T

jmax

a

R

th

Area of safe operation

2

1.7
1

0.5

)
A

(

C

I

0.1

0.05

0.02

0.01
1 5 10 26 50

VCE (V)

10 ms single pulse,
free air

25 °C

70 °C

100

• Structure of pre-amp. stage

Tone-control

G

T

2.8 kΩ

Ci

33 pF

G

47 kΩ

Fig. Simplified structure of AN5270 pre-amp. stage

Explanation of gain notations :
G

: Gain of tone-amp. (treble-amp.)

T

: Gain of flat-response amp.

G

F

G

: Gain of bass-amp.

B

: Gain at point 1 with respect to VIN.

G

L1

G

: Gain at point 2 with respect to VIN.

L2

: Gain of power stage.

G

P

G

: Gain of pre-amp. stage.

pre

Pre-amp. stage

Point1

G

2.8 kΩ

G

F

L1

Point2

2

G

B

5.6 kΩ

G

L2

1 kΩ

3

Input

C2 C1

V

IN

LF input

R1

Volume-control

Power

stage

G

P

(25 dB)

Output

8

4

ICs for Audio Common Use AN5270

■ Technical Information (continued)

• Structure of pre-amp. stage (continued)

amp., the flat-amp., amplifies the signal equally for all frequencies in the range of 20 Hz to 70 kHz.

G

F

G

amp., the treble or tone-amp., has an internal LPF connected to its inverting input. The non-inverting input of G

T

amp. is connected to the input signal. Thus, the output of GT passes only the upper range of frequencies (cut-off
frequency = 2.5 kHz).
GB amp., the bass-amp., amplifies the lower range of frequencies. Its cut-off frequency is determined by R1· C1.
If LF pin is left open, then G

• Gain calculation
General formula for gain of pre-amp. is (when vol. = max., tone = max.) :

G

= GL1 · (GF + GT) − GB · G

pre

amp. has no effect on the overall frequency response.

B

L2

T

By vector analysis as shown in fig. Vector diagram of G

[dB] = G

G

V

pre

+ G

P

pre

,

GV [dB] = 20 log √[GL1 · (GF + GT) − GB · GL2 · cosθ]2 + (GB · GL2 · sinθ)2 + G
where GL1= 0.5

G

= 1.3

F

= 5.4

G

B

0 for (100 Hz)



GT= 1.3 for (1 kHz)



2.5 for (10 kHz)

= 25 dB

G

P

Z3 · 0.848

GB≈

Z3 =

Z3 + R1

6600

√1 + (2πf · C1 · 6600)

2

θ=−tan−1 (2πf · C1 · 6600)

G

V

G1

−3 dB

G2

G3

1

*

−3 dB

θ

Fig. Vector diagram of G

G1 : Gain at 100 Hz
G2 : Gain at 1 kHz
G3 : Gain at 10 kHz

: High frequency cut-off when Pin3 is open.

f

1

f

: Low frequency cut-off

2

Tone = max.

Tone = min.

P

G

pre

GB · G

GL1 · (GF + GT)

L2

pre

100 Hz

f

2

1 kHz 10 kHzf

1

Fig. Frequency response of AN5270

Note) *1: This is the response if LF pin is open (i.e. R1 open).

f

5

AN5270 ICs for Audio Common Use

■ Technical Information (continued)

• Cut-off frequencies

f

=

1

=

f

2

• Summary of frequency characteristics for typical values of R1 and C1

Note) * : Tone = max.

1

2π · G · Ci · Ri

1

2π · R1 · C1

= 2.5 kHz where G = 40 times, Ci = 33 pF, R1 = 47 kΩ

= 530 Hz if R1 = 3 kΩ, C2 = 0.1 µF

Actual Gain(dB)*

R1(Ω) C1(F)

G1(100 Hz) G2(1 kHz) G3(10 kHz)

f2(Hz) ∆GTC(dB)

2.2 k 0.039 µ 35.0 34.0 31.0 1.8 k 10.0

5.1k 0.039 µ 31.0 31.0 31.0 800 21.0
10 k 0.039 µ 26.0 27.5 30.0 408 21.0

20 k 0.039 µ 17.5 25.0 30.0 204 18.0

∞24.0 26.0 30.0  14.0

1 k 0.1 µ 36.0 35.0 30.0 1.6 k 10.0

2.2 k 0.1 µ 34.0 32.0 30.0 723 19.0
3 k 0.1 µ 33.0 31.0 30.0 530 21.0

5.1 k 0.1 µ 31.0 29.0 30.0 312 19.0

10 k 0.1 µ 26.0 27.0 30.0 159 17.0
20 k 0.1 µ 18.0 26.0 30.0 8 0 16.0

Table. Tabulated summary of frequency characteristics of AN5270.

• Volume control

The volume control range is 0 to 5 V. This range is adopted so as to simplify the pull-up of typical PWM output from
micro-computer IC. The following simplified PWM output configuration is suggested :
The high input impedance of the volume control pin makes the input current extremely small, so that it is not
necessary to have an external buffer at the PWM output.
Configuration A :

5 V

Volume

control

300 Ω
Treble

control

4

R4

18 kΩ

2.2 µFC4

5

12 kΩR5

PWM output

Micro­computer
IC

300 Ω

Fig. Volume control interface circuit for AN5270

6

ICs for Audio Common Use AN5270

■ Technical Information (continued)

• Volume control (continued)

Alternative responses of volume control may be obtained by addition of a diode across the resistor R4.

Configuration B :

Volume

attenuation

Config. B

R4

18 kΩ

A

2.2 µF

C

Configuration C :

R4

18 kΩ

12 kΩ

12 kΩ

0 0.6 V Volume DC Pin4 (V) 5 V

2.2 µF
10 kΩ

Fig. Volume characteristics of AN5270

• Tone control

The tone cotrol range is 0 to 5 V. Please adopt the same PWM configration as suggested for the volume control.
The variable range of tone control is about 20 dB, depending on the values of R1 · C1 components that are connected
to Pin3.
Internally, there is a LPF formed by Ri = 47 kΩ and a Miller capacitor which is formed by Ci = 33 pF and the gain
amplifier G = 40. The cut-off frequency is thus :

1

2π · G · Ci · Ri

= 2.5 kHz

To achieve a rich deep-bass effect, the tone control should be adjusted to minimum (0 V). To achieve a bright treble
effect, the tone control should be adjusted to maximum.

requirement

• V

CC

V

should be fixed at 12 V. Achieve best performance by obtaining this supply from a 12 V voltage regulator output.

CC1

7

AN5270 ICs for Audio Common Use

■ Technical Information (continued)

• Power-on/off pop-noise elimination

In most TV applications, it is observed that there is a short period of delay from power-on to the onset of sound. The
purpose of power-on mute is to eliminate any unpleasant 'pop' noise (caused by transients) by effectively muting the
power amplifier. In this IC, an internal mute is incorporated at the instant of power-on and power-off. The length of
mute time depends on the value of the ripple filter condenser at Pin6. In the following diagram, the value of the
condenser connected to RF pin (Pin6) is 47 µF.

18 V

V

CC2

Pin9

12 V

V

CC1

Pin1

270 ms

Internal
mute-pulse

Volume
Pin4

170 ms

1.2 s

5 V

Output
Pin8

470 ms

220 ms

Fig. Power on/off typical timing characteristics of AN5270

(The above timing diagram is based on the evaluation circuit that is given in the product specification. Actual chasis
performance may differ due to differences in power supply and external components.)

The internal mute pulse will force the volume to minimum by grounding Pin4 momentarily. In most chasis, it is also
common to implement externally the audio defeat feature by forcing Pin4 to ground momentarily, for the purpose of
power-on/off as well as during channel switching. Should the internal mute be insufficient, it is recommended that
the external audio defeat be used.

8

ICs for Audio Common Use AN5270

■ Technical Information (continued)

• Power-off pop-noise countermeaasure (for study consideration only)

To prevent power-off shock noise, please ensure that V
ensure that V

variation will not cause any 'pop' , one suggested countermeasure is to connect a condenser between

CC1

CC2

Pin6 and Pin9 (e.g. 47 µF, use non-polarity type if possible).

(18 V) declines faster than V

(12 V). In addition, to

CC1

C6

47 µF

RF

6

Cpop

47 µF

NP 2200 µF

V

CC2

9

Fig. One suggested counter-measure against power-off 'pop' for AN5270.

This effect of Cpop is to discharge C6 gradually as soon as power is switched off.
However, it must be noted that the necessity of this countermeasure is dependent upon the set design and other timing
considerations.

• THD improvement (for study consideration only)

1 6

47 µF

C6

Fig. THD improvement circuit.

Instead of connecting the negative terminal of C6 to ground, when that terminal is connected to Pin1, it is noticed that
THD is improved considerably.

9