Audio Stage (Lm358D,Mp7721) - Hitachi 22LD3750DC Service Manual

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6.3 Audio Stage

Audio Preamplifier(LM358D)

These circuits consist of two independent, high gain, internally frequency compensated which were

designed specifically to operate from a single power supply over a wide range of voltages. The low

power supply drain is independent of the magnitude of the power supply voltage.

Audio Amplifier (MP7721)

The MP7721 is a stereo 2 x 10W Class D Audio Amplifier. It is one of MPS' second generation

fully integrated audio amplifiers which dramatically reduces solution size by integrating the following:

• 250mΩ power MOSFETs Startup

• Shutdown pop elimination

• Short circuit protection

• Mute / Standby

The MP7721 utilizes a single ended output structure capable of delivering 2 x 10W into 8Ω

speakers. MPS Class D Audio Amplifiers exhibit the high fidelity of a Class A/B amplifier at efficiencies

greater than 90%. The circuit is based on the MPS' proprietary variable frequency topology that delivers

low distortion, fast response time and operates on a single power supply.

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