![]() ![]() The open-drain MOSFET would always be N-channel. This would be simple, as it can be implemented inside an Integrated circuit without the need for a power transistor stage. There is an underlying assumption that the Intel 4-pin fan standard drives the PWM line by a open-drain MOSFET. Both MOSFETS are of similar size and thermal rating fully able to drive a fan with several amps of current. I also checked the 4-pin system fan connector on my GA-EG41MFT-US2H motherboard and saw a PA102FDG P-channel MOSFET next to a 100uF capacitor. Next to a 16V, 47uF capacitor sits a FR5505 P-channel MOSFET. I had I look at the fan control circuits on a uniprocessor Power Mac G5 that I had just pulled out. ![]() The typical application circuit 1 is almost identical to your drawing. ![]() Building a CustoMac Hackintosh: Buyer's Guide ![]()
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