TDA7375 Datasheet. Www.s Manuals.com. Utc

User Manual: Datasheets TDA7375-J15-A, TDA7375G-J15-A, TDA7375H, TDA7375L-J15-A, TDA7375V.

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UNISONIC TECHNOLOGIES CO., LTD
TDA7375

LINEAR INTEGRATED CIRCUIT

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. / 4Ω
– 2 x 25W / 4Ω@14.4V, 1KHz, 10%
– 2 x 35W / 4Ω EIAJ
– 4 x 7 W / 4Ω@14.4V, 1KHz, 10%
– 4 x 12W / 2Ω@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
Normal
TDA7375-J15-A-T

Ordering Number
Lead Free Plating
TDA7375L-J15-A-T

TDA7375L-J15-A-T
(1) Packing Type

Halogen Free
TDA7375G-J15-A-T

Package

Packing

HZIP-15A

Tube

(1) T: Tube

(2) Package Type

(2) J15-A: HZIP-15A

(3) Lead Plating

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

www.unisonic.com.tw
Copyright © 2009 Unisonic Technologies Co., Ltd

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PIN CONNECTION (Top view)

OUT 3

14
13

OUT 4
VCC

INPUT

11
10

INPUT 4
DIAGNOSTICS

S - GND

PW - GND

7
6

STAND - BY
SVR

INPUT

INPUT
VCC

OUT 2

OUT 1

BLOCK DIAGRAM
VCC
4

VCC

IN 1

ST - BY

IN 2

IN 3

A1
+
-

A2 1NV
+
-

A3
+
-

OUT 1

OUT 2

OUT 3

A4 1NV
14

+
-

IN 4

10
6

SVR

PW - GND

S - GND

UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw

OUT 4

DIAGNOSTICS

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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
IO(PEAK)
repetitive f >10Hz
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
Junction to Case

SYMBOL
θJC

RATINGS
1.8

UNIT
°C/W

ELECTRICAL CHARACTERISTICS

(VS = 14.4V; RL = 4Ω; f = 1 KHz; Ta =25°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
Supply Voltage Range
VS
IN
VI(ST-BY)
ST-BY Threshold Voltage
OUT VO(ST-BY)
Voltage Saturation on pin 10
VSAT Sink Current at Pin 10 = 1mA
Output Offset Voltage
VO(OFF)
Non Inverting Channels
Rg = 0; S.E.
”A” weighted, Inverting Channels
Input Noise Voltage
eN
Bridge, Rg = 0; 22Hz ~ 22KHz
Total Quiescent Drain Current
IQ
RL = ∞
Max Driving Current Under Fault
ST-BY Pin Current(pin 7)
IST-BY
Play Mode Vpin7 = 5V
ST-BY Current Consumption
IST-BY VST-BY = 0 ~ 1.5V
Clipping Detector Output OFF ICD(OFF) d = 1% (Note 2)
Average Current
ON
ICD(ON) d = 5% (Note 2)
Single Ended
Input Impedance
RIN
Bridge
Bridge
THD = 10%;
Single Ended
Output Power
POUT
RL = 4Ω
Single Ended, RL = 2Ω
PO(MAX) VS = 14.4V, Bridge
PO(EIAJ) VS = 13.7V, Bridge
Single Ended, POUT=0.1~4W
Distortion
THD RL = 4Ω
Bridge, POUT = 0.1 ~ 10W
f = 1KHz Single Ended
f = 10KHz Single Ended
Cross Talk
CT
f = 1KHz Bridge
f = 10KHz Bridge
Single Ended
Voltage Gain
GV
Bridge
Voltage Gain Match
GV
Supply Voltage Rejection
SVR Rg = 0; f = 300Hz
Stand-by Attenuation
AST-BY PO = 1W
Notes: 1. See built-in S/C protection description
2. Pin 10 Pulled-up to 5V with 10KΩ; RL = 4Ω
3. Saturated square wave output.
Output Power (Note 3)

Max.
EIAJ

UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw

MIN
8

TYP

MAX
18
1.5

UNIT
V

0.7
150

V
mV

3.5

2
5
3.5

µV

200
5
50
100

20
10
23
6.5
36
32

90
160
30
15
25
7
12
40
35
0.02
0.03
70
60

19
25
50
80

µV
mA
mA
µA
µA
µA
µA
KΩ

W
W
W
0.3

55
60
20
26

21
27
0.5

%
dB
dB
dB
dB
dB
dB
dB
dB
dB

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TYPICAL TEST AND APPLICATION CIRCUIT
ST-BY

10K R1
C7
10μF

IN FL

C1 0.22μF
5

IN FR

Note:
C9, C10, C11, C12 could be
reduced if the 2Ω operation is not
required.

OUT FL

C9 2200μF

OUT FR

C11 2200μF

OUT RL

C12 2200μF

OUT RR

C4 0.22μF
IN RR

C10 2200μF
2

C2 0.22μF
IN RL

VS
C5
1000μF

C6
100nF

11
C3 0.22μF
6
C8 47μF

14
8

DIAGNOSTICS

Figure 1: Quad Stereo

Figure 2: Double Bridge

ST-BY

10K

VS
10μ F

IN L

100nF
7

1
2200μ F

0.22μ F
2

IN L
0.22μ F
IN BRIDGE

2200μ F
12

0.47μ F

OUT L
OUT R

11
6

47μ F

1000μ F

OUT
BRIDGE

DIAGNOSTICS

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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www.unisonic.com.tw

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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

CL IPPING
DET.
OUTPUT CURR.

ICL IP

time

0
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.

ST-BY PIN
VOLTAGE
2V
t

OUT TO Vs SHORT

VREF

OUTPUT
WAVEFORM
SOFT SHORT

Upin 10

UTC TDA7375

OUT TO GND SHORT

Vpin 10

CORRECT TURN-ON
FAULT DETECTION
t
SHORT TO GND
OR TO Vs

CHECK AT TURN-ON
(TEST PHASE)

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

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www.unisonic.com.tw

Figure 7: Fault Waveforms

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ST-BY PIN
VOLTAGE

Vs
OUTPUT
WAVEFORM
t

Vpin 10
WAVEFORM
t
CLIPPING
SHORT TO GND
OR TO Vs

THERMAL
PROXIMITY

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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www.unisonic.com.tw

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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.

UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw

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