efficient motor speed control using Class D audio amplifiers

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I saw this:
http://www.maxim-ic.com/appnotes.cfm/an_pk/1951

Then realized:
1. Maxim parts are made of unobtanium.
2. The MAX4295 is only good to 2 Watts.

Ah, phooey.

Michael

 

[[email protected]]

I saw this:http://www.maxim-ic.com/appnotes.cfm/an_pk/1951

Then realized:
1.  Maxim parts are made of unobtanium.
2.  The MAX4295 is only good to 2 Watts.

Ah, phooey.

Michael

Since the amp is fed DC, this is really just simple PWM, right? You
can roll this yourself or probably adapt a DC/DC power suppy chip.

 

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Since the amp is fed DC, this is really just simple PWM, right? You
can roll this yourself or probably adapt a DC/DC power suppy chip.

Ah, hit by the blindingly obvious... Class D amp driving a motor = 555
+ mosfet + protection diode...

Michael

 

[[email protected]]

LMD18201

John

Thanks. I was looking to control a 12V, 8A (peak startup current)
pump motor, but maybe class d audio amps are not the most efficient
way of going about it... I'm now looking into surplus laptop power
supply (~100W, 12V) + 555 + mosfet PWM.

Michael