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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. / 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: PA7375L Halogen-free: PA7375G
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 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 (c) 2008 Unisonic Technologies Co., Ltd
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PA7375
PIN CONNECTION (Top view)
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
VCC
4 13
VCC
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
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 10 QW-R107-058.B
PA7375
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
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 = 100s 4.5 A Output Peak Current IO(PEAK) repetitive f > 10Hz 3.5 A Power Dissipation PD 27 W 150 C TJ Junction Temperature -40~+150 C TSTG 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 (VS=14.4V, RL=4, f=1KHz, Ta=25C, unless otherwise specified)
SYMBOL TEST CONDITIONS VS IN VIN(ST-BY) ST-BY Threshold Voltage OUT VOUT(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 = 4 Single Ended, RL = 2 Max. PO(MAX) VS = 14.4V, Bridge Output Power (Note 3) EIAJ PO(EIAJ) VS = 13.7V, Bridge Single Ended, POUT=0.1~4W Distortion THD RL = 4 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 POUT = 1W Note: 1. See built-in S/C protection description 2. Pin 10 Pulled-up to 5V with 10K; RL = 4 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 V V mA mA A A A A K 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 10F IN FL C1 0.22F IN FR C2 0.22F IN RL C4 0.22F IN RR Note: C9, C10, C11, C12 could be reduced if the 2 operation is not required. C3 0.22F 6 C8 47F 8 9 11 12 5 4 7 13
LINEAR INTEGRATED CIRCUIT
ST-BY
C6 100nF 3 1
VS C5 1000F
C10 2200F 2 C9 2200F 15 C11 2200F 14 10 C12 2200F
OUT FL
OUT FR
OUT RL
OUT RR
DIAGNOSTICS
Figure 1: Quad Stereo
Figure 2: Double Bridge
10K 10 F 7 13 3 100nF 1 2200 F 5 0.22 F IN BRIDGE 0.47 F 47 F 12 11 6 8 9 10 14 15 OUT BRIDGE 2 2200 F
ST-BY
VS 1000 F
IN L 0.22 F IN L
4
OUT L OUT R
DIAGNOSTICS
Figure 3: Stereo/Bridge
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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 ) 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 ~10C before the shutdown threshold is reached.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 10 QW-R107-058.B
PA7375
TYPICAL APPLICATION INFORMATION (Cont.)
LINEAR INTEGRATED CIRCUIT
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 at pin 10 CORRECT TURN-ON FAULT DETECTION
t
CHECK AT TURN-ON SHORT TO GND OR TO Vs
Fault Waveforms
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www.unisonic.com.tw
6 of 10 QW-R107-058.B
PA7375
TYPICAL APPLICATION INFORMATION (Cont.)
LINEAR INTEGRATED CIRCUIT
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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www.unisonic.com.tw
7 of 10 QW-R107-058.B
PA7375
TYPICAL CHARACTERISTICS
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
8 of 10 QW-R107-058.B
PA7375
TYPICAL CHARACTERISTICS (Cont.)
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
9 of 10 QW-R107-058.B
PA7375
TYPICAL CHARACTERISTICS (Cont.)
LINEAR INTEGRATED CIRCUIT
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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