Sharp LC-24LE250V-BK, Service Manual

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LC-24LE250
LC-22LE250
11
Table 3: Recomnended operating conditions
B. MAIN AMPLIFIER (TS4962M)(2.5 W option)
a. General Description
The TS4962M is a differential Class-D BTL power amp lifier. It is able to drive up to 2.3W
into a 4 load and 1.4W into a 8 load at 5V. It achieves outstanding efficiency (88%typ.)
compared to classical Class-AB audio amps. The gain of the device can be controlled via two
external gain-setting resistors. Pop & click reduction circuitry provides low on/off switch
noise while allowing the device to start within 5ms
. A standby function (active low) allows
the reduction of current consumption to 10nA typ.
b. Features
- Operating from VCC = 2.4V to 5.5V
- Standby mode active low
- Output power: 3W into 4 and 1.75W into 8
- with 10% THD+N max and 5V power supply.
- Output power: 2.3W @5V or 0.75W @ 3.0V
- into 4 with 1% THD+N max.
- Output power: 1.4W @5V or 0.45W @ 3.0V
- into 8 with 1% THD+N max.
- Adjustable gain via external resistors
- Low current consumption 2mA @ 3V
- Efficiency: 88% typ.
- Signal to noise ratio: 85dB typ.
- PSRR: 63dB typ. @217Hz with 6dB gain
- PWM base frequency: 250kHz
- Low pop & click noise
- Thermal shutdown protection
- Available in flip-chip 9 x 300 m (Pb-free)