SGS Thomson Microelectronics TDA7350A Datasheet

22W BRIDGE-STEREO AMPLIFIER FOR CAR RADIO

VERYFEW EXTERNALCOMPONENTS
NO BOUCHEROTCELLS
NO BOOSTRAPCAPACITORS
HIGHOUTPUT POWER
NO SWITCH ON/OFF NOISE
VERYLOW STAND-BYCURRENT
FIXED GAIN (30dB STEREO)
PROGRAMMABLETURN-ON DELAY

Protections:

OUTPUT AC-DC SHORT CIRCUIT TO
GROUNDANDTO SUPPLYVOLTAGE

VERYINDUCTIVE LOADS
LOUDSPEAKERPROTECTION
OVERRATINGCHIP TEMPERATURE
LOADDUMP VOLTAGE
FORTUITOUS OPEN GROUND
ESD

DESCRIPTION

The TDA7350A is a new technology class AB
Audio Power Amplifier in the Multiwatt



package

TDA7350A

MULTIWATT11

ORDERING NUMBER: TDA7350A

designedfor car radioapplications.
Thanks to the fully complementaryPNP/NPN out­put configuration the high power performance of
the TDA7350A is obtained without bootstrap ca­pacitors.
A delayed turn-on mute circuit eliminates audible
on/off noise, and a novel short circuit protection
system prevents spurious intervention with highly
inductiveloads.

APPLICATIONCIRCUIT BRIDGE

April 1995

1/22

TDA7350A

PIN CONNECTION (Top view)

ABSOLUTE MAXIMUMRATINGS

Symbol Parameter Test Conditions Unit

V
V
V

P

T

stg,TJ

Operating Supply Voltage 18 V

S

DC Supply Voltage 28 V

S

Peak Supply Voltage (for t = 50ms) 40 V

S

Output Peak Current (nonrep. for t = 100µs) 5 A

I

o

Output Peak Current (rep.freq. > 10Hz) 4 A

I

o

Power Dissipation at T

tot

=85°C36W

case

Storage and Junction Temperature -40 to 150 °C

THERMAL DATA

Symbol Description Value Unit

R

thj-case

Thermal Resistance Junction-case Max 1.8 °C/W

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TDA7350A

ELECTRICAL CHARACTERISTICS (Referto the test circuits, T

=25°C, VS=14.4V, f = 1KHz unless

amb

otherwisespecified)

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

I

A

I

SB

T

Supply Voltage Range 8 18 V

S

Total Quiescent Drain Current stereo configuration 120 mA

d

Stand-by attenuation 60 80 dB

SB

Stand-by Current 100 µA
Thermal Shut-down Junction

sd

150 °C

Temperature

STEREO

P

d Distortion P

SVR Supply Voltage Rejection R

CT Crosstalk f = 1KHz

R
G
G

E

Output Power (each channel) d = 10%

o

R

=2Ω

L

R

= 3.2Ω

L

R

=4Ω

L

d = 10%; V
R

=2Ω

L

R

= 3.2Ω

L

R

=4Ω

L

= 0.1 to 4W; RL= 3.2Ω 0.5 %

o

= 10kΩ C3 = 22µF

g

= 13.2V

S

7

45 50

f = 100Hz C3 = 100µF

11

8

6.5

9

6.5

5.5

57

45 55

f = 10KHz

Input Resistance 30 50 KΩ

I

Voltage Gain 27 29 31 dB

V

Voltage Gain Match 1 dB

V

Input Noise Voltage Rg=50Ω(*)

IN

R

= 10KΩ (*)

g

R

Ω(**)

g=50

R

= 10KΩ (**)

g

50

1.5
2
2

2.7 7

BRIDGE

W
W
W

W
W
W

dB

dB
dB

µV
µV
µV
µV

P

Output Power d = 10%; RL=4Ω

o

d Distortion P

V

Output Offset Voltage 250 mV

OS

SVR Supply Voltage Rejection R

R

G

E

(*) Curve A
(**) 22Hz to 22KHz

Input Resistance 50 KΩ

I

Voltage Gain 33 35 37 dB

V

Input Noise Voltage Rg=50Ω(*)

IN

d = 10%; R
d = 10%; V

R

=4Ω

L

R

= 3.2Ω

L

= 0.1 to 10W; RL=4Ω 1%

o

= 10KΩ C3 = 22µF

g

f = 100Hz C3 = 100µF

= 3.2Ω

L

= 13.2V

S

16

22

17.5
19

45 50

57

2

20

R

g = 10K

R

=50Ω(**)

g

R

= 10KΩ (**)

g

Ω (*)

2.5

2.7

3.2

W
W

W
W

dB

µV
µV
µV
µV

3/22

TDA7350A

Figure1: STEREO Test and Appication Circuit

220µF

220µF

Figure2: P.C. Boardand Layout(STEREO) ofthe circuitof fig. 1 (1:1 scale)

1000µF

1000µF

4/22

Figure3: BRIDGE Test and AppicationCircuit

Figure4: P.C. Boardand Layout(BRIDGE) of the circuitof fig. 3 (1:1scale)

TDA7350A

5/22

TDA7350A

RECOMMENDED VALUES OF THE EXTERNAL COMPONENTS (ref to the Stereo Test and Applica-

tionCircuit)

Component

C1 0.22µF Input

C2 0.22µF Input

C3 100µF Supply Voltage

C4 22µF Stand-By

C5 220µF (min) SupplyBy-Pass Dangerof Oscillations
C6 100nF (min) SupplyBy-Pass Dangerof Oscillations
C7 2200µF Output

Recommended

Value

Purpose

Decoupling
(CH1)

Decoupling
(CH2)

Rejection
Filtering
Capacitor

ON/OFF Delay

Decoupling
CH2

Figure5: OutputPowervs. SupplyVoltage

(Stereo)

Larger than the Recomm.

Value

——

——

Longer Turn-On Delay Time Worse Supply Voltage Rejection.

Delayed Turn-Offby Stand-By
Switch

- Decrease ofLow Frequency Cut Off

- Longer Turn On Delay

Smaller than the Recomm.

Shorter Turn-On Delay Time
Dangerof Noise (POP)

Dangerof Noise (POP)

- Increase of Low Frequency Cut Off

- Shorter Turn On Delay

Figure6: OutputPowervs. SupplyVoltage

(Stereo)

Value

Figure7: OutputPowervs. SupplyVoltage

(Stereo)

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Figure8: OutputPowervs. SupplyVoltage

(Bridge)

TDA7350A

Figure9: Output Powervs. SupplyVoltage

(Bridge)

Figure 11: Distortionvs OutputPower(Stereo)

Figure 10: Drain Current vs SupplyVoltage

(Stereo)

Figure 12: Distortionvs OutputPower(Stereo)

Figure 13: Distortionvs OutputPower(Stereo) Figure14: Distortion vs OutputPower(Bridge)

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