Sharp LC-22DV510K, Руководство по обслуживанию

Страница: 28 / 124

28
LC-22DV510
LC-24DV510
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
(max. can offer 3.0 Watts @ Load = 3Ω,THD=10%, AVdd=DVdd=5.5Volt)with high efficiency filter -free
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

CMOS Technology
 High Efficiency 85%

High PSRR 70dB at 217Hz

Differential OP-amp Input

AZAD2102B provides Vibration-Spectrum Modulation clock for reduce EMI

Provide Mute function(set Mute_B to GND will go into Mute status)

For the input stage AZAD2102B built-in a 10Kohm resistors (Gain setting=29.5dB)
 Maximum Battery Life and Minimum Heat

Efficiency With an 8- Ω Speaker:

3.5 mA Quiescent Current

Output Power at 10% THD

2.85Watts at AVdd=DVdd=5.0Volt, Rload=4Ω
 1.45Watts at AVdd=DVdd=3.6Volt, Rload=4Ω

0.30Watts at AVdd=DVdd=3.0Volt, Rload=4Ω

1.75Watts at AVdd=DVdd=5.5Volt, Rload=8Ω

0.87Watts at AVdd=DVdd=3.6Volt, Rload=8Ω

0.41Watts at AVdd=DVdd=3.0Volt, Rload=8Ω

Eliminate Power on and Power-off “Pop” noise

A Fewer External Components
 Optimized PWM Output Stage Eliminates LC Output Filter

Internally generate 290 kHz Switching Frequency to eliminate Capacitor and Resistor

Improve PSRR (–70 dB) and Wide Supply Voltage (3.0 V to 5.5 V)

Fully Differential Design Reduces RF Rectification

This chip has been built-in a very strong ESD protection.

System level ESD 4KV (IEC 61000-4-2 ESD Contact Level)

Wafer Chip Scale Package (WCSP)

TSSOP Package with Exposed Pad