I have just done 2 projects like this. the first one used a IR2111 to drive each side, like this the PWM is on both with no switching problem. The other used 2 HPCL 4503's and a MC33153 to drive each IGBT as it required isolation, again no problem driving pwm into either or both. I had to drive both top and bottom Fets with pwm as I was creating a sine wave, and the load could be capacitive or inductive. If you only put PWM onto 1 fet in this case you could get distortion. George ----- Original Message ----- From: "Jinx" To: Sent: Wednesday, November 19, 2003 9:48 AM Subject: [EE:] Driving an H-bridge > I'm ready to power up an H-bridge made with 4 N-ch FETS > for motor control. Any advantage, recommendation or advice > as to whether the PWM is on the top or the bottom or does it > not matter ? > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics