Sharp LC-40SH340E, Service Manual

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LC-40SH340E
LC-40SH340K
5. AUDIO AMPLIFIER STAGE WITH AZAD2102(U163, U164)
5.1. General Description
17MB60 uses two 2,5W Class D Mono Audio Amplifers for from 16” to 24” TVs. AZAD2102B is a 2.9 Watts
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class-D audio power amplifier in a 1613 mm x 1613 mm wafer chip scale package (WCSP). AZAD2102B uses
Current-switch technology to achieve high performance class-d amplifier that features 0.03% THD, 85%
efficiency, –70 dB PSRR, to improve RF-rectification immunity. AZAD2102B provide a Vibration-Spectrum
modulation clock for PWM Output. This vibration frequency is around 10KHZ shift (+/- 5KHZ of Fpwm).
The advantage of the small size package (WCSP) makes AZAD2102B very suitable for mobile phone and
PDA device application. And the Class-D amplifier structure let AZAD2102B to have highly efficiency
power consumption than Class-AB amplifier. AZAD2102B can shrink the application board, reduce system
cost, and external components.
ESD level protection I/O embedded in AZAD2102B. For general applications, doesn’t need to add extra
ESD protection device (like Varistors) in application system for AZAD2102B’s I/O.
5.2. Features
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CMOS Technology
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High Efficiency 85%
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High PSRR 70dB at 217Hz
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Differential OP-amp Input
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AZAD2102B provides Vibration-Spectrum Modulation clock for reduce EMI
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Provide Mute function(set Mute_B to GND will go into Mute status)
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For the input stage AZAD2102B built-in a 10Kohm resistors (Gain setting=29.5dB)
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Maximum Battery Life and Minimum Heat
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Efficiency With an 8-;<>?
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3.5 mA Quiescent Current
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Output Power at 10% THD
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Eliminate Power on and Power-off “Pop” noise
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A Fewer External Components
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Optimized PWM Output Stage Eliminates LC Output Filter
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Internally generate 290 kHz Switching Frequency to eliminate Capacitor and Resistor
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Improve PSRR (–70 dB) and Wide Supply Voltage (3.0 V to 5.5 V)
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Fully Differential Design Reduces RF Rectification
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This chip has been built-in a very strong ESD protection.
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System level ESD 4KV (IEC 61000-4-2 ESD Contact Level)
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Wafer Chip Scale Package (WCSP)
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TSSOP Package with Exposed Pad