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Audio Power Amplifier IC LM Series

Audio Power Amplifier 170W LM4651

The combination of the LM4651 driver IC and the LM4652 power MOSFET Class D power amplifier IC provides a high efficiency amplifier solution, suitable for self-powered speakers, subwoofers and quality car boosters.

The LM 4651 is a fully integrated conventional pulse width modulator (PWM) driver, containing undervoltage, short circuit, overmodulation, and thermal shutdown protection circuitry. The IC features a standby function which shuts down the pulse width modulation, minimizing supply current.

The LM 4652 is a fully integrated H-bridge Power Mosfet IC in a TO220 power package. The IC has a built in temperature sensor to alert the LM4651 when the die temperature exceeds the threshold limit.

Used together, the LM4651 and LM4652 form a simple, compact, efficient, high quality power audio amplifier solution complete with protection, normally seen only in Class AB amplifiers.



The maximum efficiency of this circuit is 85% at 125W with a standby attenuation greater than 100dB. The THD at 10W, 4 ohms, 10 - 500Hz is max. 0.3%. The supply voltage can not exceed ± 22V.



For the best performance a suitable preamplifier is required. With the addition of a preamplifier the gain of the power stage can be greatly reduced to improve performance. The gain should be set to 10 V/V allowing for low gain on the Class D stage with a total system gain high enough to be a complete solution for line level sources.

The input filter used here does not noticeably increase THD performance but will help to maintain a flat frequency response as the Q of the output filter changes with load impedance.



Do not attempt to build this amplifier as your first project! Class D high power amplifiers are expensive, difficult to build and a very small error during assembly can lead to total devastation of the power IC or other costly components.

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