Electronics > Beginners

Solenoid driver MOSFET flyback protection

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Ian.M:
Yep, if you are using PWM to manage the solonoid current, you probably should be letting it recirculate through an anti-parallel diode across the coil during the PWM off period for less current ripple.  If you aren't using PWM and you do need fast turnoff, its preferabe to dump the energy into a resistor in series  with the diode  across the coil, as power resistors have much better pulse overload ratings than semiconductors, and can be safely run at a much higher temperature.

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