PA7375 UTC | Alldatasheet
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UNISONIC TECHNOLOGIES CO., LTD PA7375 LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1 of 10 Copyright © 2008 Unisonic Technologies Co., Ltd QW-R107-058.B 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 d ual 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 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 Ordering Number Normal Lead Free Plating Halogen Free Package Packing PA7375-J15-D-T PA7375L-J15-D-T PA7375G-J15-D-T HZIP-15D Tube
PA7375 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 10 www.unisonic.com.tw QW-R107-058.B PIN CONNECTION (Top view) BLOCK DIAGRAM 986 4 13 3 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 A2 1NV A4 1NV
PA7375 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 10 www.unisonic.com.tw QW-R107-058.B ABSOLUTE MAXIMUM RATINGS 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 repetitive f > 10Hz IO(PEAK) 3.5 A Power Dissipation P D 27 W Junction Temperature TJ 150 °C Storage Temperature TSTG -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. ELECTRICAL CHARACTERISTICS (VS=14.4V, RL=4Ω, f=1KHz, Ta=25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Supply Voltage Range V S 8 18 V IN V IN(ST-BY) 1.5 ST-BY Threshold Voltage OUT V OUT(ST-BY) 3.5 V Voltage Saturation on pin 10 V SAT Sink Current at Pin 10 = 1mA 0.7 V Output Offset Voltage V O(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 I Q R L = ∞ 200 mA Max Driving Current Under Fault 5 mAST-BY Pin Current(pin 7) I ST-BY Play Mode Vpin7 = 5V 50 µA ST-BY Current Consumption I ST-BY V ST-BY = 0 ~ 1.5V 100 µA OFF I CD(OFF) d = 1% (Note 2) 90 µA Clipping Detector Output Average Current ON I CD(ON) d = 5% (Note 2) 160 µA Single Ended 20 30 Input Impedance R IN Bridge 10 15 KΩ Bridge 23 25 Single Ended 6.5 7 Output Power P OUT THD = 10%; RL = 4Ω Single Ended, RL = 2Ω 12 W Max. P O(MAX) V S = 14.4V, Bridge 36 40 W Output Power (Note 3) EIAJ P O(EIAJ) V S = 13.7V, Bridge 32 35 W f = 1KHz Single Ended 70 f = 10KHz Single Ended 60 f = 1KHz Bridge 55 Cross Talk CT f = 10KHz Bridge 60 dB Single Ended 19 20 21 Voltage Gain G V Bridge 25 26 27 dB Voltage Gain Match G V 0.5 dB Supply Voltage Rejection SVR R G = 0, f = 300Hz 50 dB Stand-by Attenuation A ST-BY P OUT = 1W 80 90 dB Note: 1. See built-in S/C protection description 2. Pin 10 Pulled-up to 5V with 10K Ω; RL = 4Ω 3. Saturated square wave output.
PA7375 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 of 10 www.unisonic.com.tw QW-R107-058.B 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 reve rsed 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 smoot h 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 fo r 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 hi gher 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 r eached at any of the out puts 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.
PA7375 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 of 10 www.unisonic.com.tw QW-R107-058.B 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 OUT TO VS. SHORT SOFT SHORT OUT TO GND SHORT CORRECT TURN-ON FAULT DETECTION Stand by PIN VOLTAGE OUTPUT t CHECK AT TURN-ON SHORT TO GND OR TO Vs t t VOLTAGE at pin 10 Fault Waveforms
PA7375 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 7 of 10 www.unisonic.com.tw QW-R107-058.B 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
PA7375 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 8 of 10 www.unisonic.com.tw QW-R107-058.B TYPICAL CHARACTERISTICS
PA7375 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 9 of 10 www.unisonic.com.tw QW-R107-058.B TYPICAL CHARACTERISTICS (Cont.)
PA7375 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 10 of 10 www.unisonic.com.tw QW-R107-058.B 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.