I'm trying to make a 3 phase motor controller with IR2301 and IRFPC50 MOSFET.

I connected everything according to IR2301 datasheet. For capacitors I’m using 10 uF (between VCC and GND) and 2.2uF (between Vb and Vs). For logic voltage im using 5 V (from arduino) and for supply I'm using 240 V.

The problem is on the high side, I supply a signal (from arduino) to HIN and the HO output stays on longer than input signal.

enter image description here On the image you can see the blue is the signal from arduino and yellow is output of the driver.

I don't know where is the problem please help!

enter image description here

Here are the outputs (for testing a voltage of 60v was used and no load connected): enter image description here Here is the signal of arduino. Yellow HIN and blue is LIN.

enter image description here This is the VCC (5v from arduino)

enter image description here This is the voltage of Vb pin

enter image description here This is the voltage of Vs pin

Images of project: enter image description here

enter image description here

  • 2
    \$\begingroup\$ Welcome to EE.SE! Please show your schematic. \$\endgroup\$ – winny Feb 5 at 14:38
  • \$\begingroup\$ Im using one from datasheet, under typical connection: infineon.com/dgdl/… \$\endgroup\$ – Maca757 Feb 5 at 17:39
  • \$\begingroup\$ The devil is in the details. Show your schematic. Show Vs and Vb in your oscillogram. \$\endgroup\$ – winny Feb 5 at 17:49
  • 2
    \$\begingroup\$ Why are there graphs for "Vs pin" and "High MOSFET output"? That should be the same node, otherwise the floating bootstrap can't work. \$\endgroup\$ – Unimportant Feb 6 at 19:33
  • 1
    \$\begingroup\$ Vb still looks wrong. The bootstrap cap should "ride" on top of Vs. In your case Vb is just flat. You do realise that Vs is supposed to be connected to the low FET's drain? If it isn't then how is the bootstrap cap supposed to charge? \$\endgroup\$ – Unimportant Feb 7 at 15:14

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.