Does anyone know a regular Voltage Mode Control Chip for buck converters?

Hi Sam,

You can use the 3843 type parts and run them in voltage mode by driving the CS pin using the slope compensation circuit setup such that the input to the CS pin ramps from 0V to 1V.

Regards

Peter

Sam,

I've used the UCC25701 in a AC DC forward. It can be used in a buck converter topology. The chip has a built in feed forward circuit and volt -sec clamp. The built in feedforward provides excellent line rejection -just as good as current mode control.  You have to supply your own error amp as the input goes straight to an uncommitted comparator. I like this about the UCC25701. If you have a cost sensitive design you can use a sot23 tlv431 for the error amp. If you need high performance you can choose a high speed op amp.

Good luck with your design,

Chuck 

What is the part number?  UC3843 is a Current Mode Controller, not Voltage Mode.

Sam

Hi Sam,

The part number tor Ti's voltage mode controller is UCC25701.

Chuck

Hi Sam,

Glad I could help. Would you mind marking the question as answered? I got a bar bet with a friend that I can reach a thousand by the end of the month.

Thanks,

Chuck

Just do it.

Sam