gemini86
Well-known member
Hey gang,
I've been fighting with this boost converter for the G9-51X for quite a while now. The first design used a cheapy mc34063, but I was not getting the needed efficiency. It's an old gal, so you can't expect too much, I guess. I 've now tried a new layout with a MAX1771 controller, plus I switched to some SMD components on a professional proto PCB, to save both space, and to cut down the trace lengths in some critical areas.
The problem I'm having now is that the mosfet seems to be stuck ON when in the circuit, or the controller is PWMing closer to ON, than OFF. This is causing the converter to just start to fry. Luckily my psu has a current limit feature that is cutting the +24v power to about 50% duty cycle, so my pcb or components don't fry.
Somebody who knows more about this type of tech, please take a look and tell me where I've knuckleheaded this design.
I've been fighting with this boost converter for the G9-51X for quite a while now. The first design used a cheapy mc34063, but I was not getting the needed efficiency. It's an old gal, so you can't expect too much, I guess. I 've now tried a new layout with a MAX1771 controller, plus I switched to some SMD components on a professional proto PCB, to save both space, and to cut down the trace lengths in some critical areas.
The problem I'm having now is that the mosfet seems to be stuck ON when in the circuit, or the controller is PWMing closer to ON, than OFF. This is causing the converter to just start to fry. Luckily my psu has a current limit feature that is cutting the +24v power to about 50% duty cycle, so my pcb or components don't fry.
Somebody who knows more about this type of tech, please take a look and tell me where I've knuckleheaded this design.