PA7375 [UTC]
2 x 35W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO; 2× 35W双路/四路功放汽车收音机
| 型号： | PA7375 |
| 厂家： | 
Unisonic Technologies |
| 描述： | 2 x 35W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
| 文件： | 总10页 (文件大小：396K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
PA7375
LINEAR INTEGRATED CIRCUIT
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.
FEATURES
* High output power capability:
– 2 x 40W Max. / 4Ω
Lead-free:
PA7375L
– 2 x 25W / 4Ω@14.4V, 1KHz, 10%
– 2 x 35W / 4Ω EIAJ
Halogen-free: PA7375G
PROTECTIONS
– 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
* Output AC/DC short circuit
– to GND
– to VS
– across the load
– Internally fixed gain (26dB BTL)
* Stand-by function (CMOS compatible)
* No audible pop during st-by operations
* Diagnostics facility for:
* 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
– Clipping
– Out to GND short
– Out to VS short
– Soft short at turn-on
– Thermal shutdown proximity
ORDERING INFORMATION
Ordering Number
Package
Packing
Tube
Normal
PA7375-J15-D-T
Lead Free Plating
PA7375L-J15-D-T
Halogen Free
HZIP-15D
PA7375G-J15-D-T
www.unisonic.com.tw
Copyright © 2008 Unisonic Technologies Co., Ltd
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PA7375
LINEAR INTEGRATED CIRCUIT
PIN CONNECTION (Top view)
BLOCK DIAGRAM
VCC
VCC
3
A1
13
4
+
1
IN 1
OUT 1
-
7
A2 1NV
ST - BY
2
+
-
OUT 2
5
IN 2
A3
+
15
OUT 3
-
12
IN 3
A4 1NV
14
+
-
OUT 4
11
IN 4
10
DIAGNOSTICS
6
8
9
SVR
PW - GND
S - GND
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PA7375
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Vop
RATINGS
UNIT
V
Operating Supply Voltage
DC Supply Voltage
18
28
VS
V
Peak Supply Voltage (for t = 50ms)
VS(PEAK)
50
V
not repetitive t = 100µs
repetitive f > 10Hz
4.5
3.5
A
A
Output Peak Current
IO(PEAK)
Power Dissipation
PD
TJ
27
W
°C
°C
150
Junction Temperature
Storage Temperature
TSTG
-40~+150
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 (VS=14.4V, RL=4ꢀ, f=1KHz, Ta=25°C, unless otherwise specified)
PARAMETER
SYMBOL
VS
TEST CONDITIONS
MIN
8
TYP
MAX UNIT
Supply Voltage Range
18
V
IN
VIN(ST-BY)
1.5
ST-BY Threshold Voltage
V
OUT VOUT(ST-BY)
3.5
Voltage Saturation on pin 10
Output Offset Voltage
VSAT
Sink Current at Pin 10 = 1mA
0.7
V
VO(OFF)
150
mV
Non Inverting Channels
Inverting Channels
2
5
RG = 0; S.E.
”A” weighted,
µV
Input Noise Voltage
eN
Bridge, RG = 0; 22Hz ~ 22KHz
RL = ∞
3.5
µV
mA
mA
µA
µA
µA
µA
Total Quiescent Drain Current
ST-BY Pin Current(pin 7)
IQ
200
5
Max Driving Current Under Fault
Play Mode Vpin7 = 5V
VST-BY = 0 ~ 1.5V
IST-BY
50
100
ST-BY Current Consumption
IST-BY
Clipping Detector Output OFF ICD(OFF) d = 1% (Note 2)
90
160
30
Average Current
ON
ICD(ON) d = 5% (Note 2)
Single Ended
20
10
23
6.5
Input Impedance
RIN
Kꢀ
Bridge
15
Bridge
25
THD = 10%;
RL = 4ꢀ
Single Ended
7
Output Power
POUT
W
Single Ended, RL = 2ꢀ
12
Max. PO(MAX) VS = 14.4V, Bridge
EIAJ PO(EIAJ) VS = 13.7V, Bridge
36
32
40
W
W
Output Power (Note 3)
Distortion
35
Single Ended, POUT=0.1~4W
Bridge, POUT = 0.1 ~ 10W
0.02
0.03
70
THD
RL = 4ꢀ
%
0.3
f = 1KHz Single Ended
f = 10KHz Single Ended
f = 1KHz Bridge
f = 10KHz Bridge
Single Ended
60
Cross Talk
CT
dB
55
60
20
26
19
25
21
27
Voltage Gain
GV
dB
Bridge
Voltage Gain Match
GV
0.5
dB
dB
dB
Supply Voltage Rejection
Stand-by Attenuation
SVR
RG = 0, f = 300Hz
50
80
AST-BY POUT = 1W
90
Note: 1. See built-in S/C protection description
2. Pin 10 Pulled-up to 5V with 10Kꢀ; RL = 4ꢀ
3. Saturated square wave output.
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PA7375
LINEAR INTEGRATED CIRCUIT
TYPICAL TEST AND APPLICATION CIRCUIT
10K R1
ST-BY
VS
C7
C6
C5
10μF
100nF
1000μF
7
13
3
IN FL
IN FR
IN RL
IN RR
1
2
4
5
C10 2200μF
C9 2200μF
C11 2200μF
C12 2200μF
OUT FL
OUT FR
OUT RL
OUT RR
C1 0.22μF
C2 0.22μF
C4 0.22μF
C3 0.22μF
C8 47μF
12
11
6
15
Note:
14
10
C9, C10, C11, C12 could be
reduced if the 2Ω operation is not
required.
8
9
DIAGNOSTICS
Figure 1: Quad Stereo
Figure 2: Double Bridge
10K
ST-BY
IN L
VS
10μ F
100nF
1000μ F
7
13
3
1
2
4
5
OUT L
OUT R
0.22μ F
0.22μ F
0.47μ F
2200μ F
2200μ F
IN L
IN BRIDGE
12
11
15
14
OUT
BRIDGE
6
8
9
10
47μ F
DIAGNOSTICS
Figure 3: Stereo/Bridge
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PA7375
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION INFORMATION
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 ꢀ) 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 COUT 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 VS 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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PA7375
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION INFORMATION (Cont.)
HANDLING OF THE DIAGNOSTICS SIGNAL
Because of kinds of information(clipping detection, output fault, thermal proximity) is available at the same pin,
this signal must be handled to discriminate each event which could be done by taking into account the different
timing of the diagnostic output during each case.
Output Fault Waveforms
Stand by
PIN
VOLTAGE
2V
t
OUT TO VS. SHORT
OUTPUT
SOFT SHORT
t
OUT TO GND SHORT
VOLTAGE
CORRECT TURN-ON
at pin 10
FAULT DETECTION
t
CHECK AT TURN-ON
SHORT TO GND OR TO Vs
Fault Waveforms
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PA7375
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION INFORMATION (Cont.)
Waveforms
The clip detector signaling produces a low level at pin 10 normally; based on this an interface circuitry to
differentiate the information is necessary in the schematic below
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QW-R107-058.B
PA7375
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
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QW-R107-058.B
PA7375
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS (Cont.)
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PA7375
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS (Cont.)
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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