Two-channel power amplifier on MAX9751. Scheme, description

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Two-channel power amplifier based on the MAX9751 chip. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers

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Hi all. We continue the theme of low-power amplifiers on integrated circuits. This time, consider the amplifier on the MAX9751 chip. What is remarkable about this microcircuit? Well, first of all - a low supply voltage - 5 volts, unipolar, with a quite tangible output power - 2,6 watts per channel. In addition, there is a headphone output with a separate amplifier and an input selector - two signal sources can be connected.

Supply voltage	4,5-5,5
Current consumption no signal, mA	14
Output power (maximum), W:	2,6
Harmonic coefficient (P=1W, Rload=4 Ohm),	0,02%
Signal-to-noise ratio, dB	90
Operating frequency range, Hz	22-22000

The switching scheme is as follows:

Two-channel power amplifier based on the MAX9751 chip. Amplifier circuit

A few more words about the microcircuit. This is a class AB bridge amplifier, built-in overheating protection, output short circuit protection, boom-bang noise suppression when the amplifier is turned on and off. And given that the microcircuit can operate at temperatures from -40 to +85 degrees Celsius, this piece of iron can be used with great success in various sluts and road speakers to disturb the sleep of compartment neighbors on the train.

Funny item list:

Nominal
C1	1uF
C2	1uF
C3	1uF
C4	1uF
C5	1uF
C6	1uF
C7	1uF
C8	1uF
C9	0,1

S1	Any with fixation
XS1	Headphone jack - depends on headphones

DA1	MAX9751

Publication: radiokot.ru

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