rompelstilchen
Full Member level 2
mosfet FDN340P-> DC motor switching
Hi,
I want to do PWM from an mcu using a FDN340P mosfet, driving a dc motor, so I made a test, without the mcu first
if I set the gate to 0 (vss) the motor runs smoothly (200mA)
if I want to stop the motor, setting the gate to 9v, instead of stopping, it runs slower, but then the current goes up to 3 A and the transistor heats like hell
this does not make sens at all
why is the motor not stopping, why is the current raising to 3A while the motor runs slower ? I thought a P-channel mosfet would close itself if set to VCC
I also tried using a 10k res between 9V and gate but still the same
regards
Hi,
I want to do PWM from an mcu using a FDN340P mosfet, driving a dc motor, so I made a test, without the mcu first
if I set the gate to 0 (vss) the motor runs smoothly (200mA)
if I want to stop the motor, setting the gate to 9v, instead of stopping, it runs slower, but then the current goes up to 3 A and the transistor heats like hell
this does not make sens at all
why is the motor not stopping, why is the current raising to 3A while the motor runs slower ? I thought a P-channel mosfet would close itself if set to VCC
I also tried using a 10k res between 9V and gate but still the same
regards
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