Philips tda7294 DATASHEETS

®

TDA7294

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

VERY HIG H OPERATI NG VOLTAGE R ANGE (±40V)

DMOS POWER STAGE HIGH OUTPUT POWER (UP TO 100W MU-

SIC POWER) MUTING/STAND- BY FUNC TION S NO SWITCH ON/OFF NOISE NO BOUCHEROT CELLS VERY LOW DISTORTION VERY LOW NOISE SHORT CIRCUIT PROTECTION THERMAL SHUTDOWN

DESCRIPTION

The TDA7294 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, Topclass TV). Thanks to the wide voltage range and

Figure 1: Typical Application and Test Circuit

MULTIPOWER BCD TECHNOLOGY

Multiwatt15V Multiwatt15H

ORDERING NUMBERS:

TDA7294V TDA7294HS

to the high out current c apability it is able to supply the highest power into both 4Ω and 8Ω loads even in presence of poor supply regulation, with high Supply Voltage Rejection.

The built in muting function with turn on delay simplifies the remote operation avoiding switching on-off noises.

+VsC7 100nF C6 1000µF

VM

VSTBY

January 2003

C2

R2

22µF

680Ω

C1 470nF

R1 22K

R5 10K

R4 22K

C3 10µF C4 10µF

IN- 2

IN+

IN+MUTE

MUTE

STBY

R3 22K

3

4

10 9

TDA7294

MUTE

STBY

1 STBY-GND

+PWVs+Vs

713

-

+

THERMAL

SHUTDOWN

-Vs -PWVs

C9 100nF C8 1000µF

-Vs

S/C

PROTECTION

158

14

6

OUT

C5

22µF

BOOTSTRAP

D93AU011

1/17

TDA7294

PIN CONNECTION (Top view)

TAB connected to -V

BLOCK DIAGRAM

S

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

I

O

P

tot

T

op

T

stg

Supply Voltage (No Signal)

S

Output Peak Current 10 A Power Dissipation T

= 70°C50W

case

Operating Ambient Temperature Range 0 to 70

, TjStorage and Junction Temperature 150

2/17

50 V

±

C

°

C

°

TDA7294

THERMAL DATA

Symbol Description Value Unit

R

th j-case

Thermal Resistance Junction-case Max 1.5

C/W

°

ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit V

= 50 Ω; T

R

g

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

amb

= ±35V, RL = 8Ω, GV = 30dB;

S

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

I I

V

I

OS

P

Supply Range

S

Quiescent Current 20 30 65 mA

q

Input Bias Current 500 nA

b

Input Offset Voltage +10 mV

OS

Input Offset Current +100 nA RMS Continuous Output Power d = 0.5%:

O

Music Power (RMS) IEC268.3 RULES - ∆t = 1s (*)

d Total Harmonic Distortion (**) P

V

= ± 35V, RL = 8

S

V

= ± 31V, RL = 6

S

V

= ± 27V, RL = 4

S

Ω Ω Ω

d = 10% R

= 8Ω ; VS = ±38V

L

R

= 6Ω ; VS = ±33V

L

R

= 4Ω ; VS = ±29V (***)

L

= 5W; f = 1kHz

O

P

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

O

= ±27V, RL = 4

V

S

P

= 5W; f = 1kHz

O

P

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

O

Ω:

10

±

60 60 60

70 70 70

100 100 100

0.005

0.01

40 V

±

0.1

W W W

% %

SR Slew Rate 7 10 V/µs

G G e

, f

f

L

R

SVR Supply Voltage Rejection f = 100Hz; V

T

STAND-BY FUNCTION (Ref: -V

V

ST on

V

ST off

ATT

I

q st-by

MUTE FUNCTION (Ref: -V

V

Mon

V

Moff

ATT

Note (*):

MUSIC POWER CONCEPT MUSIC POWER is the maximal power which the amplifier is capable of producing across the rated load resistance (regardless of non linearity) 1 sec after the application of a sinusoidal input signal of frequency 1KHz .

Note (**): Note (***):

Open Loop Voltage Gain 80 dB

V

Closed Loop Voltage Gain 24 30 40 dB

V

Total Input Noise A = curve

N

f = 20Hz to 20kHz

Frequency Response (-3dB) PO = 1W 20Hz to 20kHz

H

Input Resistance 100 k

i

= 0.5Vrms 60 75 dB

ripple

Thermal Shutdown 145

S

or GND)

S

1 25

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 1 3 mA

or GND)

S

Mute on Threshold 1.5 V Mute off Threshold 3.5 V Mute AttenuatIon 60 80 dB

mute

Tested with optimized Application Board (see fig. 2)

Limited by the max. allowable current.

V

µ

V

µ

Ω

C

°

3/17

TDA7294

Figure 2: P.C.B. and components layout of the circuit of figure 1. (1:1 scale)

Note:

The Stand-by and Mute functions can be referred either to GND or -VS. On the P.C.B. is possible to set both the configuration through the jumper J1.

4/17

TDA7294

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

R1 (*) 22k INPUT RESISTANCE INCREASE INPUT

R2 680

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

R4 22k ST-BY TIME

R5 10k MUTE TIME

C1 0.47µF INPUT DC

C2 22µF FEEDBACK DC

C3 10µF MUTE TIME

C4 10µF ST-BY TIME

Ω

CLOSED LOOP GAIN

SET TO 30dB (**)

CONSTANT

DECOUPLING

CONSTANT

LARGER THAN

SUGGESTED

IMPRDANCE

DECREASE OF GAIN INCREASE OF GAIN

LARGER ST-BY

ON/OFF TIME

LARGER MUTE

ON/OFF TIME

LARGER MUTE

ON/OFF TIME

LARGER ST-BY

ON/OFF TIME

SMALLER THAN

SUGGESTED

DECREASE INPUT

IMPEDANCE

SMALLER ST-BY

ON/OFF TIME;

POP NOISE

SMALLER MUTE

ON/OFF TIME HIGHER LOW

FREQUENCY

CUTOFF

HIGHER LOW FREQUENCY

CUTOFF

SMALLER MUTE

ON/OFF TIME

SMALLER ST-BY

ON/OFF TIME;

POP NOISE

C5 22µF BOOTSTRAPPING SIGNAL

C6, C8 1000µF SUPPLY VOLTAGE

C7, C9 0.1µF SUPPLY VOLTAGE

(*) R1 = R3 FOR POP OPTIMIZATION (**) CLOSED LOOP GAIN HAS TO BE ≥ 24dB

BYPASS

DEGRADATION AT LOW FREQUENCY

DANGER OF

OSCILLATION

DANGER OF

OSCILLATION

5/17

TDA7294

TYPICAL CHARACTERISTICS

(Application Circuit of fig 1 unless otherwise specified)

Figure 3: Output Power vs. Supply Voltage.

Figure 5: Output Power vs. Supply Voltage

Figure 4: Distortion vs. Output Power

Figure 6: Distortion vs. Output Power

Figure 7: Distortion vs. Frequency

6/17

Figure 8: Distortion vs. Frequency