![]() Inductive loads (motors) may require special care since they can generate large voltage spikes that can damage the MOSFET. Always use thermally conductive grease between the FET and the heat sink, and remember that the heat sink is electrically live. It is also possible to connect multiple FETs in parallel for even more current capacity. Higher power FETs, such as the IRFZ48N or IRF1010Z can be substituted if even larger currents are required. This circuit can switch a fairly high amount of current, an IRFZ34N MOSFET can handle over 35 Amps if connected to a proper heat sink. The high side version of the circuit is useful when one side of the load has to be grounded. ![]() N Channel devices tend to handle more current than P Channel devices, they are also less expensive. The low side version of the circuit uses an N Channel FET, the high side version of the circuit uses a P Channel FET. ![]() The diagrams are for 12V operation only and there are high side (common ground) and low side (common +12V) versions. ![]() These two schematics are variations on another PWM circuit. Skema Rangkaian High Side PWM Motor/Light Controller
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