I'm repairing a small rotary hand tool(engraver/grinder), 12V battery operated for a friend who decided to run it from a reverse connected 12V power supply - result dead MOSFETs & snubber diode. These MOSFETS (NCE30H15K) are cheap (x10 for 2.5$) & the MCU on board is still operating (buttons operate speed select LED's) so is worth a go.
After de-soldering the 2x TO-252 MOSFETs, diode & cleaning carbonized gunk can see are series connected.
+12V-->Motor-->D-S-->D-S-->Gnd. Gates are driven individually from gate driver IC & PWM from MCU.
Q1. Is this series connection just for increased voltage withstand or something else. NCE30H15K are 30V 150A 4mohm., motor is 1.8A no load.
Maybe cheaper x2 lower volt devices or optimize RDSon ?
Q2. I can't identify supply for the 5 pin Gate driver yet, markings looks like N53238E ? . . .
After de-soldering the 2x TO-252 MOSFETs, diode & cleaning carbonized gunk can see are series connected.
+12V-->Motor-->D-S-->D-S-->Gnd. Gates are driven individually from gate driver IC & PWM from MCU.
Q1. Is this series connection just for increased voltage withstand or something else. NCE30H15K are 30V 150A 4mohm., motor is 1.8A no load.
Maybe cheaper x2 lower volt devices or optimize RDSon ?
Q2. I can't identify supply for the 5 pin Gate driver yet, markings looks like N53238E ? . . .