Datasheet TDA7250 Datasheet (SGS Thomson Microelectronics)

.WIDESUPPLYVOLTAGERANGE: 20TO90V

(± 10 to ± 45V)

.VERY LOW DISTORTION

.AUTOMATICQUIESCENTCURRENT

CONTROL FOR THE POWER TRANSISTORS
WITHOUTTEMPERATURESENSE
ELEMENTS

.OVERLOAD CURRENT PROTECTION FOR

THEPOWERTRANSISTORS

.MUTE/STAND-BYFUNCTIONS

.LOW POWER CONSUMPTION

.OUTPUTPOWER60 W/8Ω AND100 W/4Ω

DESCRIPTION

The TDA7250 stereo audio driver is designed to
drivetwo pair ofcomplementaryoutputtransistor in
the Hi-Fipower amplifiers.

TDA7250

60 W HI-FIDUAL AUDIO DRIVER

DIP20

ORDERING NUMBER : TDA7250

APPLI CATI O N CIR CUIT

March 1995

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TDA7250

PIN CONNECTI O N (top view)

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

Supply Voltage 100 V

V

s

P

T

j,Tstg

Power Dissipation at T

tot

Storage and Junction Temperature – 40 to + 150 °C

=60°C 1.4 W

amb

THERMAL DATA

Symbol Parameter Value Unit

R

2/11

th j-amb

Thermal Resistance Junction-ambient Max. 65 °C/W

TDA7250

PIN FUNCTIONS

N° Name Function

1V
2 NON–INV. INP. CH. 1 Channel 1 Input Signal.
3 QUIESC. CURRENT

4 SENSE (–) CH. 1 Negative voltage sense input for overload protection and for automatic quiescent

5 ST. BY / MUTE / PLAY Three-functions Terminal.

6 CURRENT PROGRAM High Impedance Power-stages Monitor.
7 SENSE (–) CH. 2 Negative Voltage Sense Input for Overload Protection and for Automatic

8 QUIESC. CURRENT

9 NON–INV. INP. CH. 2 Channel 2 Input Signals.
10 V
11 INVERT. INP. CH. 2 Feedback from Output (channel 2).
12 OUT (–) CH. 2 Out Signal to Lower Driver Transistor of Channel 2.
13 OUT (+) CH. 2 Out Signal to Higher Driver Transistor of Channel 2.
14 SENSE (+) CH. 2 Positive Voltage Sense Input for Overload Protection and for Automatic

15 COMMON AC GROUND AC Input Ground in MUTE Condition.
16 V
17 SENSE (+) CH. 1 Positive Voltage Sense Input for Overload Protection and for Automatic

18 OUT (+) CH. 1 Out Signal to High Driver Transistor of Channel 1.
19 OUT (–) CH. 1 Out Signal to Low Driver Transistor of Channel 1.
20 INVERT. INP. CH. 1 Feedback from Output (channel 1).

– POWER SUPPLY Negative Supply Voltage.

S

This capacitor works as an integrator, to control the quiescent current to output

CONTR. CAP. CH1

devices in no-signal conditions on channel 1.

current control.

For V

= 1 to 3 V, the device is in MUTE and only quiescent current flows in

IN

the power stages ; - for V
quiescent current is present in the power stages ; - for V

Quiescent Current Control.
This capacitor works as an integrator, to control the quiescent current to output

CONTR. CAP. CH. 2

devices in no-signal conditions on channel 2. If the voltage at its terminals drops
under 250 mV, it also resets the device from high-impedance state of output
stages.

– POWER SUPPLY Negative Supply Voltage.

s

Quiescent Current Control.

+ POWER SUPPLY Positive Supply Voltage.

S

Quiescent Current Control.

< 1 V, the device is in STAND-BY mode and no

IN

> 3 V, the devic

IN

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TDA7250

BLOCK DIAGRAM

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TDA7250

ELECTRICAL CHARACTERISTICS (T

=25°C, Vs= ± 35 V, play mode, unless otherwise

amb

specified)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

Supply Voltage ± 10 ± 45 V

s

Quiescent Drain Current Stand-by Mode 8 mA

I

d

Play Mode 10 14

Input Bias Current 0.2 1 µA

I

b

V

Input OffsetVoltage 1 ± 10 mV

os

Input OffsetCurrent 100 200 nA

I

os

Open Loop Voltage Gain f = 100 Hz 90 dB

G

v

f = 10 kHz 60

Input Noise Voltage RG= 600 Ω

e

N

B = 20 Hz to 20 kHz

SR Slew Rate 10 V/µs

d Total Harmonic Distortion G

= 26 dB, Po=40W

v

f = 1 kHz
f = 20 kHz

V

Output Voltage Swing 60 V

opp

P

Output Power (*) Vs= ± 35 V, RL=8Ω

o

I

Output Current ± 5mA

o

=±30 V, RL=8Ω

V

s

=±35 V, RL=4Ω

V

s

SVR Supply Voltage Rejection f = 100 Hz 75 dB

Channel Separation f = 1 kHz 75 dB

C

s

3 µV

0.004

0.03

60
40

100

%
%

pp

W
W
W

MUTE / STANDBY/ PLAY FUNCTIONS

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Input Current (pin 5) 0.1 µA

I

i

Comparator Standby / Mute

V

th

1.0 1.25 1.5 V

Threshold (**)

H Hysteresis Standby / Mute 200 mV

Comparator Mute / Play

V

th

2.4 3.0 3.6 V

Threshold (**)

H Hysteresis Mute / Play 300 mV

Mute Attenuation f = 1 kHz 60 dB
Input Voltage Max. (pin 5) 12 (**) V

V

i

(*) Application circuit of fig. 1 f = 1 KHz ; d = 0.1 % ; Gv=26dB.
(**) Referred to − V

.

s

CURRENT SURVEY CIRCUITRY

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Comparator Reference to + V

Delay Time 10 µs

t

d

to – V

S
S

0.8

0.8

1
1

1.4

1.4

QUIESCENTCURRENT CONTROL

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Capacitor Current Charge

Discharge

Comparator Reference to + V

to – V

S
S

30

250

10 20

60

500

25 mV

10

V
V

µA
µA

mV

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TDA7250

Figure 1 : ApplicationCircuit withPower Darlingtons.

Note : Q1/Q2 = Q3/Q4= TIP 142/TIP147

GV = 1 +R1/R2

6/11

TDA7250

Figure 2 : OutputPower vs. SupplyVoltage.

Figure 4 : ChannelSeparation.

Figure3 : Distortionvs.OutputPower(*).

Figure5 : Supply VoltageRejectionvs.

Frequency.

Figure 6 : QuiescentCurrentvs. SupplyVoltage. Figure7 : QuiescentCurrentvs. T

amb

.

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TDA7250

Figure8 : Total DissipatedPower vs. Output

Powe r (*).

Figure 10 : Play-muteStandbyOperation.

Figure 9 : Efficiencyvs. OutputPower(*).

(*) Complet e circuit

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Figure 11 : ApplicationCircuit Using Power Transistors.

TDA7250

Figure 12 : SuggestedTransistor Types for Various Loads and Powers.

RL=8Ω TL=4Ω

15W +30W +50W +70W

BDX

53/54A

BDX

53/54B

BDW

93/94B

TIP

142/147

30W +50W +90W +130W

BDW

93/94A

BDW

93/94B

BDV

64/65BMJ11013/11014

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TDA7250

DIP20 PACKAGE MECHANICAL DATA

DIM.

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

a1 0.51 0.020

B 0.85 1.40 0.033 0.055
b 0.50 0.020

b1 0.38 0.50 0.015 0.020

D 24.80 0.976
E 8.80 0.346
e 2.54 0.100

e3 22.86 0.900

F 7.10 0.280

I 5.10 0.201
L 3.30 0.130
Z 1.27 0.050

mm inch

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TDA7250

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for
the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifica­tions mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information pre­viously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of SGS-THOMSON Microelectronics.

 1995 SGS-THOMSON Microelectronics - All Rights Reserved

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