TDA7375 Datasheet. Www.s manuals.com. Utc

UNISONIC TECHNOLOGIES CO., LTD

TDA7375 LINEAR INTEGRATED CIRCUIT

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2 x 35W DUAL/QUAD POWER

AMPLIFIER FOR CAR RADIO

 DESCRIPTION

The UTC TDA7375 is a class AB car radio amplifier for car radio,

it can work either in dual bridge or quad single ended configuration.

The exclusive fully complementary structure of the output stage

and the internally fixed gain guarantees the highest possible power

performances with few external components. The on-board clip

detector simplifies gain compression operation. The fault

diagnostics makes it possible to detect mistakes during car radio

set assembly and wiring in the car.

 FEATURES

* High output power capability:

– 2 x 40W Max. / 4

– 2 x 25W / 4@14.4V, 1KHz, 10%

– 2 x 35W / 4 EIAJ

– 4 x 7 W / 4@14.4V, 1KHz, 10%

– 4 x 12W / 2@14.4V, 1KHz, 10%

* Minimum external components:

– No bootstrap capacitors

– No Boucherot cells

– Internally fixed gain (26dB BTL)

* Stand-by function (CMOS compatible)

* No audible pop during st-by operations

* Diagnostics facility for:

– Clipping

– Out to GND short

– Out to VS short

– Soft short at turn-on

– Thermal shutdown proximity

Lead-free: TDA7375L

Halogen-free:TDA7375G

 PROTECTIONS

* Output AC/DC short circuit

– to GND

– to VS

– across the load

* Soft short at turn-on

* Overrating chip temperature with soft

thermal limiter

* Load dump voltages urge

* Very inductive loads

* Fortuitous open GND

* Reversed battery

* ESD

 ORDERING INFORMATION

Ordering Number

Normal Lead Free Plating Halogen Free Package Packing

TDA7375-J15-A-T TDA7375L-J15-A-T TDA7375G-J15-A-T HZIP-15A Tube

TDA7375L-J15-A-T

(1) Packing Type

(2) Package Type

(3) Lead Plating

(1) T: Tube

(2) J15-A: HZIP-15A

(3) G: Halogen Free, L: Lead Free, Blank: Pb/Sn

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 PIN CONNECTION (Top view)

OUT 3

OUT 4

VCC

INPUT 3

INPUT 4

DIAGNOSTICS

S - GND

PW - GND

STAND - BY

SVR

INPUT 2

INPUT 1

VCC

OUT 1

OUT 2

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

 BLOCK DIAGRAM

2

15

14

10

986

11

12

5

7

413 3

1

VCC VCC

IN 1

ST - BY

IN 2

IN 3

IN 4

PW - GNDSVR S - GND

OUT 2

OUT 1

OUT 3

OUT 4

DIAGNOSTICS

+

-

+

-

+

-

+

-

A3

A2 1NV

A4 1NV

A1

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 ABSOLUTE MAXIMUM RATINGS

PARAMETER SYMBOL RATINGS UNIT

Operating Supply Voltage VOP 18 V

DC Supply Voltage VS 28 V

Peak Supply Voltage (for t = 50ms) VS(PEAK) 50 V

not repetitive t = 100µs 4.5 A

Output Peak Current repetitive f >10Hz IO(PEAK) 3.5 A

Power Dissipation (TC= 85°C) PD 36 W

Junction Temperature TJ +150 °C

Storage Temperature TSTG, TJ -40~+150 °C

Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.

Absolute maximum ratings are stress ratings only and functional device operation is not implied.

 THERMAL DATA

PARAMETER SYMBOL RATINGS UNIT

Junction to Case JC 1.8 °C/W

 ELECTRICAL CHARACTERISTICS

(VS = 14.4V; RL = 4; f = 1 KHz; Ta =25°C, unless otherwise specified)

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

Supply Voltage Range VS 8 18 V

IN VI(ST-BY) 1.5

ST-BY Threshold Voltage OUT VO(ST-BY) 3.5 V

Voltage Saturation on pin 10 VSAT Sink Current at Pin 10 = 1mA 0.7 V

Output Offset Voltage VO(OFF) 150 mV

Non Inverting Channels 2

Rg = 0; S.E.

”A” weighted, Inverting Channels 5 µV

Input Noise Voltage eN

Bridge, Rg = 0; 22Hz ~ 22KHz 3.5 µV

Total Quiescent Drain Current IQ R

L =  200 mA

Max Driving Current Under Fault 5 mA

ST-BY Pin Current(pin 7) IST-BY Play Mode Vpin7 = 5V 50 µA

ST-BY Current Consumption IST-BY V

ST-BY = 0 ~ 1.5V 100 µA

OFF ICD(OFF) d = 1% (Note 2) 90 µA Clipping Detector Output

Average Current ON ICD(ON) d = 5% (Note 2) 160 µA

Single Ended 20 30

Input Impedance RIN Bridge 10 15

K

Bridge 23 25

Single Ended 6.5 7

Output Power POUT THD = 10%;

RL = 4 Single Ended, RL = 2 12

W

Max. PO(MAX) V

S = 14.4V, Bridge 36 40 W

Output Power (Note 3) EIAJ PO(EIAJ) V

S = 13.7V, Bridge 32 35 W

Single Ended, POUT=0.1~4W 0.02

Distortion THD RL = 4

Bridge, POUT = 0.1 ~ 10W 0.03 0.3 %

f = 1KHz Single Ended

f = 10KHz Single Ended 70

60 dB

dB

Cross Talk CT f = 1KHz Bridge

f = 10KHz Bridge

55

60 dB

dB

Single Ended 19 20 21 dB

Voltage Gain GV Bridge 25 26 27 dB

Voltage Gain Match GV 0.5 dB

Supply Voltage Rejection SVR Rg = 0; f = 300Hz 50 dB

Stand-by Attenuation AST-BY P

O = 1W 80 90 dB

Notes: 1. See built-in S/C protection description

2. Pin 10 Pulled-up to 5V with 10K; RL = 4

3. Saturated square wave output.

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 TYPICAL TEST AND APPLICATION CIRCUIT

DIAGNOSTICS

Note:

C9, C10, C11, C12 could be

reduced if the 2Ωoperation is not

required. C12 2200μF

C11 2200μF

C9 2200μF

C10 2200μF

C5

1000μF

C6

100nF

C7

10μF

C1 0.22μF

C2 0.22μF

C4 0.22μF

C3 0.22μF

C8 47μF

OUT RR

OUT RL

OUT FR

OUT FL

IN FL

IN FR

IN RL

IN RR

ST-BY

10K R1

VS

1

2

15

14

10

3137

4

5

12

11

689

Figure 1: Quad Stereo

Figure 2: Double Bridge

DIAGNOSTICS

1000μF100nF

10μF

0.22μF

47μF

OUT R

OUT L

IN L

ST-BY

10K

VS

1

2

15

14

10

3137

4

5

12

11

689

0.47μFOUT

BRIDGE

IN BRIDGE

2200μF

Figure 3: Stereo/Bridge

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 TYPICAL APPLICATION INFORMATION

1. High Application Flexibility

It is possible that accomplish several kinds of applications ranging from 4 speakers stereo (F/R) to 2 speakers

bridge solutions with 4 independent channels

In order to avoid phase inconveniences causing sound alterations especially during the reproduction of low

frequencies. When working in single ended conditions the polarity of the speakers driven by the inverting

amplifier must be reversed respect to those driven by non inverting channels.

2. Easy Single Ended to Bridge Transition

The change from single ended to bridge configurations is made simply by means of a short circuit across the

inputs, further external component is unnecessary.

3. Gain Internally Fixed to 20dB in Single Ended, 26dB in Bridge

The function advantages not only to save component, PCB space but also optimize output noise, supply

voltage rejection and distortion

4. Silent Turn On/Off and Muting/Stand-by Function

The stand-by can be easily activated by means of a CMOS level applied to pin 7 through a RC filter. Under

stand-by condition the device is turned off completely (Vs=1mA typ.; AST-BY= 80dB min.).

Every ON/OFF operation is virtually pop free. Furthermore, at turn-on the device stays in muting condition for a

time determined by the value assigned to the SVR capacitor. While in muting the device outputs becomes

insensitive to any kinds of signal that may be present at the input terminals.

5 .STAND-BY DRIVING (pin 7)

The definition of stand-by driving networks is most important that pin 7 cannot be directly driven by a voltage

source whose current capability is higher than 5mA. In practical cases a series resistance has always to be

inserted to limit the current at pin 7 and to smooth down the stand-by ON/OFF transitions - in combination with

a capacitor - for output pop prevention. In any case, a capacitor of at least 100nF from pin 7 to S-GND, with no

resistance in between, is necessary to ensure correct turn-on.

6. BUILT–IN SHORTCIRCUIT PROTECTION

Reliable and safe operation, in presence of all kinds of short circuit involving the outputs is assured by

BUILT-IN protectors. Additionally to the AC/DC short circuit to GND, to VS, across the speaker, a SOFT

SHORT condition is signaled out during the TURN-ON PHASE so assuring correct operation for the device

itself and for the loudspeaker.

This particular kind of protection acts in a way to avoid that the device is turned on (by ST-BY) when a resistive

path (less than 16 ohms) is present between the output and GND. As the involved circuitry is normally disabled

when a current higher than 5mA is flowing into the ST-BY pin, it is important, in order not to disable it, to have

the external current source driving the STBY pin limited to 5mA.

This extra function becomes particularly attractive when, in the single ended configuration, one capacitor is

shared between two outputs (see Fig. 4).

COUT

Figure 4.

Supposing that the output capacitor COUT for any reason is shorted, the loudspeaker will not be damaged being

this soft short circuit condition revealed.

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z Diagnostics Facility

The IC is equipped with a diagnostic circuitry able to detect clipping in the output signal, thermal shutdown,

and output fault including short to GND, short to VS and soft short at turn on.

The information is available across an open collector output (pin 10) through a current sinking when the

event is detected.

AUDIO

OUTPUT

SIGNAL

ICL IP

Vo

CL IPPING

DET.

OUTPUT CURR.

0time

Figure 5: Clipping Detection Waveforms

A current sinking at pin 10 is triggered when a certain distortion level is reached at any of the outputs. This

function allows gain compression possibility whenever the amplifier is overdriven.

z Thermal Shutdown

In this case the output 10 will signal the proximity of the junction temperature to the shutdown threshold.

Typically current sinking at pin 10 will start ~10°C before the shutdown threshold is reached.

7. HANDLING OF THE DIAGNOSTICS SIGNAL

Since various kinds of information is available at the same pin (clipping detection, output fault, thermal

proximity), this signal must be handled properly in order to discriminate each event. This could be done by

taking into account the different timing of the diagnostic output during each case.

OUT TO Vs SHORT

SOFT SHORT

OUT TO GND SHORT

CORRECT TURN-ON

FAULT DETECTION

ST-BY PIN

VOLTAGE

2V

OUTPUT

WAVEFORM

t

CHECK AT TURN-ON

(TEST PHASE)

SHORT TO GND

OR TO Vs

t

Vpin 10

Figure 6: Output Fault Waveforms (see Fig. 7) Figure 7: Fault Waveforms

UTC TDA7375

10 R

V

REF

Upin 10

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ST-BY PIN

VOLTAGE

Vs

OUTPUT

WAVEFORM

t

SHORT TO GND

OR TO Vs

t

Vpin 10

WAVEFORM

THERMAL

PROXIMITY

CLIPPING

Figure 8: Waveforms

Normally the clip detector signalling produces a low level at pin 10 that is shorter than that present under faulty

conditions; based on this assumption an interface circuitry to differentiate the information is represented in the

schematic of Fig. 9.

Figure 9.

8. PCB-LAYOUT GROUNDING

The device has 2 distinct ground leads, P-GND (POWER GROUND) and S-GND (SIGNAL GROUND) which

are practically disconnected from each other at chip level. Proper operation requires that P-GND and S-GND

leads be connected together on the PCB-layout by means of reasonably low-resistance tracks.

As to the PCB-ground configuration, a starlike arrangement whose center is represented by the supply-filtering

electrolytic capacitor ground is highly advisable. In such context, at least 2 separate paths have to be provided,

one for P-GND and one for S-GND. The correct ground assignments are as follows:

- STANDBY CAPACITOR(pin 7, or any other standby driving networks): on S-GND

- SVR CAPACITOR (pin 6): on S-GND and to be placed as close as possible to the device.

- INPUT SIGNAL GROUND (from active/passive signal processor stages): on S-GND.

- SUPPLY FILTERING CAPACITORS (pins 3,13): on P-GND. The (-) terminal of the electrolytic capacitor

has to be directly tied to the battery (-) line and this should represent the starting point for all the ground

paths.

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 TYPICAL CHARACTERISTICS

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UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.

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