tda7385.pdf

TDA7385

4 x 22W FOUR BRIDGE CHANNELS CAR RADIO AMPLIFIER

@ 13.2V, 1KHz, 10%

CLIPPING DETECTOR

LOW DISTORTION

LOW OUTPUT NOISE

ST-BY FUNCTION

MUTE FUNCTION

AUTOMUTE AT MIN. SUPPLY VOLTAGE DE-

TECTION

DIAGNOSTICS FACILITY FOR:

– CLIPPING

– OUT TO GND SHORT

– OUT TO V S SHORT

– THERMAL SHUTDOWN

LOW EXTERNAL COMPONENT COUNT:

– INTERNALLY FIXED GAIN (26dB)

– NO EXTERNAL COMPENSATION

– NO BOOTSTRAP CAPACITORS

PROTECTIONS:

OUTPUT SHORT CIRCUIT TO GND, TO V S ,

ACROSS THE LOAD

FLEXIWATT25

ORDERING NUMBER: TDA7385

VERY INDUCTIVE LOADS

OVERRATING CHIP TEMPERATURE WITH

SOFT THERMAL LIMITER

LOAD DUMP VOLTAGE

FORTUITOUS OPEN GND

REVERSED BATTERY

ESD PROTECTION

DESCRIPTION

The TDA7385 is a new technology class AB

Audio Power Amplifier in Flexiwatt 25 package

designed for high end car radio applications.

BLOCK AND APPLICATION DIAGRAM

Vcc1

Vcc2

2.200

100nF

ST-BY

MUTE

DIAGN. OUT

IN1

OUT1+

OUT1-

0.1

PW-GND

IN2

OUT2+

OUT2-

0.1

PW-GND

IN3

OUT3+

OUT3-

0.1

PW-GND

IN4

OUT4+

OUT4-

0.1 m F

PW-GND

AC-GND

0.1

SVR

TAB

S-GND

D93AU002C

May 1997

1/12

HIGH OUTPUT POWER CAPABILITY:

4 x 30W max./4 W EIAJ

4 x 22W/4 W @ 14.4V, 1KHz, 10%

4 x 18.5W/4

TDA7385

DESCRIPTION (continued)

Thanks to the fully complementary PNP/NPN out-

put configuration the TDA7385 allows a rail to rail

output voltage swing with no need of bootstrap

capacitors. The extremely reduced components

count allows very compact sets.

The on-board clipping detector simplifies gain

compression operations. The fault diagnostics

makes it possible to detect mistakes during Car-

Radio assembly and wiring in the car.

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

V CC

Operating Supply Voltage

V CC (DC)

DC Supply Voltage

V CC (pk)

Peak Supply Voltage (t = 50ms)

I O

Output Peak Current:

Repetitive (Duty Cycle 10% at f = 10Hz)

Non Repetitive (t = 100

4.5

5.5

P tot

Power dissipation, (T case =70

T j

Junction Temperature

150

T stg

Storage Temperature

– 55 to 150

PIN CONNECTION (Top view)

D94AU117B

THERMAL DATA

Symbol

Parameter

Value

Unit

R th j-case

Thermal Resistance Junction to Case

Max.

C/W

2/12

TDA7385

ELECTRICAL CHARACTERISTICS (V S = 14.4V; f = 1KHz; R g = 600

;R L =4

;T amb =25

Refer to the Test and application circuit (fig.1), unless otherwise specified.)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

I q1

Quiescent Current

180

V OS

Output Offset Voltage

150

G v

Voltage Gain

P o

Output Power

THD = 10%

THD = 1%

THD = 10%; V S = 14V

THD = 5%; V S = 14V

THD = 1%; V S = 14V

THD = 10%; V S = 13.2V

THD = 1%; V S = 13.2V

18.5

P o max

Max. Output Power

EIAJ RULES

THD

Distortion

P o = 4W

0.3

e No

Output Noise

”A” Weighted

Bw = 20Hz to 20KHz

150

SVR

Supply Voltage Rejection

f = 100Hz

f cl

Low Cut-Off Frequency

f ch

High Cut-Off Frequency

KHz

R i

Input Impedance

100

C T

Cross Talk

f = 1KHz

I SB

St-By Current Consumption

St-By = LOW

100

V SB out

St-By OUT Threshold Voltage

(Amp: ON)

3.5

V SB IN

St-By IN Threshold Voltage

(Amp: OFF)

1.5

A M

Mute Attenuation

V O = 1Vrms

V M out

Mute OUT Threshold Voltage

(Amp: Play)

3.5

V Min

Mute IN Threshold Voltage

(Amp: Mute)

1.5

I m (L)

Muting Pin Current

V MUTE = 1.5V

(Source Current)

I m (H)

Muting Pin Current

VMUTE = 3.5V

(Source Current)

I CDOFF

Clipping Detector ”OFF” Output

Average Current

THD = 1% (*)

100

I CDON

Clipping Detector ”ON” Output

Average Current

THD = 10% (*)

190

(*) Diagnostics output pulled-up to 5V with 10K

series resistor.

3/12

TDA7385

Figure 1: Standard Test and Application Circuit

0.1

2200

Vcc1-2

Vcc3-4

ST-BY

10K

OUT1

MUTE

47K

C10

OUT2

IN1

0.1 m F

IN2

C2 0.1

OUT3

IN3

C3 0.1

IN4

OUT4

C4 0.1

S-GND

SVR

TAB

0.1 m F

D94AU179B

DIAGNOSTICS

4/12

TDA7385

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

COMPONENTS &

TOP COPPER LAYER

TDA7385

BOTTOM COPPER LAYER

5/12

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