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i bulid ESC circuit based on TLP250 gate driver and IRF3205 MOSFET ,My motor works with 5V and consume about between 6 A and 8 A. the ESC circuit works well over month with software PWM frequency = 350 hz .

After changing to hardware PWM frequency =15000 hz. when i was working , suddenly the flyback diode get on fire and make smoke then get roasted .

After some tests I found what the cause of this is the high frequency of PWM , this what cause the high temperature and then roasted the diode.What happen ? do I miscalculate the flyback diode (which is 1n4001) ?

This is my ESC : c

enter image description here

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  • \$\begingroup\$ Where’s the schematic? If you want us to guess, then my guess is you’ve used the wrong diode. \$\endgroup\$ Commented Oct 27, 2021 at 1:51
  • \$\begingroup\$ I assume open drain. How hot did the diode get before hand > 80'C What was motor DC R and inertia load like? How much Power in supply? \$\endgroup\$ Commented Oct 27, 2021 at 1:54
  • \$\begingroup\$ I don't understand the first part of your question , my power supply is 5 V for motor .. and 12 V for gate driver just to open the mosfet gate with high voltage . \$\endgroup\$ Commented Oct 27, 2021 at 2:02
  • \$\begingroup\$ How long did it take to get up to full speed with your method? Can you measure DC resistance of motor? \$\endgroup\$ Commented Oct 27, 2021 at 3:35
  • \$\begingroup\$ @Tony Stewart EE75 , If I tell the raspberry to send PWM signal to motor it goes to full speed instantly , resistance is 0.5 ohm . \$\endgroup\$ Commented Oct 27, 2021 at 3:44

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