UNISONIC TECHNOLOGIES CO., LTD
PA7375
2 x 35W DUAL/QUAD POWER
AMPLIFIER FOR CAR RADIO
DESCRIPTION
The UTC
PA7375
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.
LINEAR INTEGRATED CIRCUIT
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 V
S
short
– Soft short at turn-on
– Thermal shutdown proximity
Lead-free:
PA7375L
Halogen-free: PA7375G
PROTECTIONS
* Output AC/DC short circuit
– to GND
– to V
S
– 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
PA7375-J15-D-T
Ordering Number
Lead Free Plating
PA7375L-J15-D-T
Halogen Free
PA7375G-J15-D-T
Package
HZIP-15D
Packing
Tube
www.unisonic.com.tw
Copyright © 2008 Unisonic Technologies Co., Ltd
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QW-R107-058.B
PA7375
PIN CONNECTION
(Top view)
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
V
CC
4
13
V
CC
3
IN 1
A1
+
-
1
OUT 1
ST - BY
7
A2 1NV
+
-
2
OUT 2
IN 2
5
A3
+
-
IN 3
12
15
OUT 3
A4 1NV
+
-
14
OUT 4
IN 4
11
10
6
8
9
DIAGNOSTICS
SVR
PW - GND
S - GND
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www.unisonic.com.tw
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QW-R107-058.B
PA7375
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
PARAMETER
SYMBOL
RATINGS
UNIT
Operating Supply Voltage
Vop
18
V
DC Supply Voltage
V
S
28
V
Peak Supply Voltage (for t = 50ms)
V
S(PEAK)
50
V
not repetitive t = 100µs
4.5
A
Output Peak Current
I
O(PEAK)
repetitive f > 10Hz
3.5
A
Power Dissipation
P
D
27
W
150
°C
T
J
Junction Temperature
-40~+150
°C
T
STG
Storage Temperature
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.
ELECTRICAL CHARACTERISTICS
(V
S
=14.4V, R
L
=4Ω, f=1KHz, T
a
=25°C, unless otherwise specified)
SYMBOL
TEST CONDITIONS
V
S
IN
V
IN(ST-BY)
ST-BY Threshold Voltage
OUT V
OUT(ST-BY)
Voltage Saturation on pin 10
V
SAT
Sink Current at Pin 10 = 1mA
Output Offset Voltage
V
O(OFF)
Non Inverting Channels
R
G
= 0; S.E.
”A” weighted, Inverting Channels
Input Noise Voltage
eN
Bridge, R
G
= 0; 22Hz ~ 22KHz
Total Quiescent Drain Current
I
Q
R
L
=
∞
Max Driving Current Under Fault
ST-BY Pin Current(pin 7)
I
ST-BY
Play Mode Vpin7 = 5V
ST-BY Current Consumption
I
ST-BY
V
ST-BY
= 0 ~ 1.5V
Clipping Detector Output OFF I
CD(OFF)
d = 1% (Note 2)
Average Current
ON
I
CD(ON)
d = 5% (Note 2)
Single Ended
Input Impedance
R
IN
Bridge
Bridge
THD = 10%;
Single Ended
Output Power
P
OUT
R
L
= 4Ω
Single Ended, R
L
= 2Ω
Max. P
O(MAX)
V
S
= 14.4V, Bridge
Output Power (Note 3)
EIAJ P
O(EIAJ)
V
S
= 13.7V, Bridge
Single Ended, P
OUT
=0.1~4W
Distortion
THD
R
L
= 4Ω
Bridge, P
OUT
= 0.1 ~ 10W
f = 1KHz Single Ended
f = 10KHz Single Ended
Cross Talk
CT
f = 1KHz Bridge
f = 10KHz Bridge
Single Ended
Voltage Gain
G
V
Bridge
Voltage Gain Match
G
V
Supply Voltage Rejection
SVR
R
G
= 0, f = 300Hz
Stand-by Attenuation
A
ST-BY
P
OUT
= 1W
Note: 1. See built-in S/C protection description
2. Pin 10 Pulled-up to 5V with 10KΩ; R
L
= 4Ω
3. Saturated square wave output.
PARAMETER
Supply Voltage Range
MIN
8
3.5
0.7
150
2
5
3.5
200
5
50
100
90
160
30
15
25
7
12
40
35
0.02
0.03
70
60
60
20
26
TYP
MAX
18
1.5
UNIT
V
V
V
mV
µV
µV
mA
mA
µA
µA
µA
µA
KΩ
W
W
W
0.3
%
20
10
23
6.5
36
32
55
19
25
50
80
21
27
0.5
dB
dB
dB
dB
dB
90
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 10
QW-R107-058.B
PA7375
TYPICAL TEST AND APPLICATION CIRCUIT
10K R1
C7
10μF
IN FL
C1 0.22μF
IN FR
C2 0.22μF
IN RL
C4 0.22μF
IN RR
Note:
C9, C10, C11, C12 could be
reduced if the 2Ω operation is not
required.
C3 0.22μF
6
C8 47μF
8
9
11
12
5
4
7
13
LINEAR INTEGRATED CIRCUIT
ST-BY
C6
100nF
3
1
V
S
C5
1000μF
C10 2200μF
2
C9 2200μF
15
C11 2200μF
14
10
C12 2200μF
OUT FL
OUT FR
OUT RL
OUT RR
DIAGNOSTICS
Figure 1: Quad Stereo
Figure 2: Double Bridge
10K
10μ F
7
13
3
100nF
1
2200μ F
5
0.22μ F
IN BRIDGE
0.47μ F
47μ F
12
11
6
8
9
10
14
15
OUT
BRIDGE
2
2200μ F
ST-BY
V
S
1000μ F
IN L
0.22μ F
IN L
4
OUT L
OUT R
DIAGNOSTICS
Figure 3: Stereo/Bridge
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4 of 10
QW-R107-058.B
PA7375
TYPICAL APPLICATION INFORMATION
LINEAR INTEGRATED CIRCUIT
High Application Flexibility
To avoid phase inconveniences causing sound alterations especially during the reproduction of low frequencies.
The polarity of the speakers driven by the inverting amplifier must be reversed respect to those driven by non
inverting channels
when
working in single ended conditions.
Easy Single Ended to Bridge Transition
The change from single ended to bridge configurations is made by a short circuit across the inputs.
Gain Internally Fixed to 20dB in Single Ended, 26dB in Bridge
The function advantages: save component, PCB space and optimize output noise, supply voltage rejection and
distortion
Silent Turn On/Off and Muting/Stand-by Function
At turn-on the device stays in muting condition for a time. The device outputs becomes insensitive to any kinds
of signal that may be present at the input terminals while in muting.
STAND-BY DRIVING
The stand by pin cannot be directly driven by a voltage source whose current capability is higher than 5mA. A
series resistance has been inserted to limit the current at this pin and to smooth down the stand-by ON/OFF
transitions. To ensure correct turn-on, a capacitor of at least 100nF from pin 7 to S-GND, with no resistance in
between.
BUILT–IN SHORTCIRCUIT PROTECTION
To assure correct operation for the device itself and for the loudspeaker, a SOFT SHORT condition is signaled
out during the TURN-ON PHASE .
That acts in a way to avoid that the device is turned on (by ST-BY) when a resistive path (less than 16
Ω)
is
present between the output and GND. When a current higher than 5mA is flowing into the ST-BY pin the
involved circuitry is normally disabled.
That extra function becomes particularly attractive when, in the single ended configuration
So if the output capacitor C
OUT
for any reason is shorted, the loudspeaker will not be damaged.
Diagnostics Facility
The IC is equipped with a diagnostic circuitry able to detect the information(clipping in the output signal,
thermal shutdown, and output fault including short to GND, short to V
S and
soft short at turn on) across an
open collector output (pin 10) through a current sinking when the event is detected.
Clipping Detection Waveforms
When a certain distortion level is reached at any of the outputs a current sinking at pin 10 is triggered.
Whenever the amplifier is overdriven this function allows gain compression possibility.
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.
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www.unisonic.com.tw
5 of 10
QW-R107-058.B
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