Wednesday, June 24, 2009
170 Watt Class D Audio Power Amplifier with LM4651 and LM4652
DescriptionThe IC combination of the LM4651 driver and the LM4652 power MOSFET provides a high efficiency, Class D Amplifier solution
This circuit is ideal for car booster amplifier, active speaker/subwofer, home theater, or PC’s multimedia sound system. The maximum efficiency 85% is obtained at 125W power output condition। The total harmonics distortion is 10% at full power output of 170W। For better fidelity, the THD at 10W is only 0।3% for 10-500Hz input signal driving 4 ohm speaker
This circuit is ideal for car booster amplifier, active speaker/subwofer, home theater, or PC’s multimedia sound system. The maximum efficiency 85% is obtained at 125W power output condition। The total harmonics distortion is 10% at full power output of 170W। For better fidelity, the THD at 10W is only 0।3% for 10-500Hz input signal driving 4 ohm speaker
- Conventional pulse width modulation
- Turn-on soft start and under voltage lockout
- 50kHZ to 200kHz switching frequency range
- Externally controllable switching frequency
- Integrated error amp and feedback amp
- 15 Lead TO220 isolated package
- Self checking protection diagnostic
- Over modulation protection (soft clipping)
- Short circuit current limiting and thermal shutdown protection.
The power supply voltage cannot exceed (+-) 22V, and also, the output stage will be turned off when the supply voltage drops under 10.5V to prevent under-voltage failure both for the circuit and for the battery (if implemented for car audio application).
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