drillz
Mechanical
- Sep 15, 2007
- 21
Dear Engineers,
I am currently making an offline flyback SMPS. It uses two MOSFETs in the primary circuit and so I need an isolated gate drive.
Here is my investigative attempt thus far. Unfortunately, the output is only 0 to 7V instead of the required 0 to 16V.
I would be very grateful if any reader could help with ideas to get 0 to 16V on the secondary side. The 1:1 pulse transformer is a part from Maplins.
By the way, the path to each of the totem-pole transistors has been made so that the propagation delay is the same. (-so they don’t end ever end up momentarily ON at the same time).
-However, the bottom transistor in the totem-pole does in fact get rather hot!
This is for LED displays for a marquee company.
I am currently making an offline flyback SMPS. It uses two MOSFETs in the primary circuit and so I need an isolated gate drive.
Here is my investigative attempt thus far. Unfortunately, the output is only 0 to 7V instead of the required 0 to 16V.

I would be very grateful if any reader could help with ideas to get 0 to 16V on the secondary side. The 1:1 pulse transformer is a part from Maplins.
By the way, the path to each of the totem-pole transistors has been made so that the propagation delay is the same. (-so they don’t end ever end up momentarily ON at the same time).
-However, the bottom transistor in the totem-pole does in fact get rather hot!
This is for LED displays for a marquee company.