Low operating voltage version of a TL494?

Mark Kaufman

Other Parts Discussed in Thread: TL494, UCC28250

Is there a PWM controller similar to the TL494 that can operate with a supply voltage of 5VDC? I need push-pull outputs with some level of dead-time control. Will be using MOSFETS to drive a center-tapped transformer at 105Hz (not KHz).

Thanks!

Mark

over 11 years ago

0 John Bottrill over 11 years ago

TI__Mastermind 25130 points

Mark,

see teh attached Power Management Guide Page 43

John

Power management guide 2011.pdf

0 Mark Kaufman over 11 years ago in reply to John Bottrill

Prodigy 20 points

John,

Thanks for the quick response!

The only push-pull chips listed that could meet my supply voltage requirements (5-14VDC) seems to be the UCC28250 and the UCC3808 but unfortunately their minimum switching frequency (85KHz and 175KHz) are way too high for my application (120 Hz), Do you know of any other alternatives or can these chips (particularly the UCC3808) be run at a slower frequency? I have run the TL474 at this rate which is about 1/10th of its rated minimum.

Thanks again for your help,

Mark

Carr Engineering, Inc.

Power management

Power management forum

Low operating voltage version of a TL494?