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Arduino PWM Driver for 12v Peltier

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crutschow

crutschow

Joined Mar 14, 2008
38,674
Alasdair Fulton said:
does the freewheel diode need to be rated for max current (18A) and 12v? Schottky's this size seem to dissipate a fair pit of power.
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Yes, it needs to be rated for the maximum current.
The only way to get a lower dissipation would to use a second MOSFET as a synchronous rectifier.
Alasdair Fulton said:
When using PWM, is it best to do your cap and inductor calcs at 25% load, 50%, 75% load? I'm more concerned about efficiency at lower to mid settings (i.e. minimising ripple) as at 100% there will be no ripple...
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The ripple gets worse at lower duty cycles.
 
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