The resister is in there

the spike is on the 12 volt supply

 TC4428  is only good to 18 V
I found some that are 20 volts

A  B  C  or D?
cap ? resister?

P


On 12/21/2013 05:08 PM, Robert LeClercq wrote:

Ringing in the pri at turnoff is not so unusual, and a 30V turnoff spike is not so bad . But I don't see how that can blow the gate driver. Thats a good driver. Are you gnding the unused input? Or operating both in parallel?  Do you have a 5-10 Ohm res between driver and gate that I recommended? Is this ckt still in a proto bd? The usual way to deal with the turnoff spike is with an RCD snubber. Thats a res, cap and diode from drain to gnd.


On Saturday, December 21, 2013 4:42 PM, rotaryeng <rotaryeng@earthlink.net> wrote:
I think I am getting ringing across the primary of the flayback
tx. The spike exceeds 30 volts. It is killing my TC4428 gate driver.

What do you think of putting a 1K ohm resisters in parallel
with the primary?


Do you know of any better low side drivers?


Paul