TPS560200: Use of this part in an inverting DC/DC converter

James Wood

Part Number: TPS560200
Other Parts Discussed in Thread: TPS560430

Is there any reason why the TPS56022900, or for that matter any similar buck converter part, cannot be used in the traditional inverting configuration, in which the 'normal' output is grounded and the chip's ground 'net' becomes the negative rail? Looking to make a -5V supply, either from the 'raw' regulated +12V coming in or from a 5V onboard-regulated supply. Thanks!

over 4 years ago

0 Zhao Ma over 4 years ago

TI__Genius 15135 points

Hi, James

Where do you see that saying TPS560200 cannot be used in inverting configuration?

0 James Wood over 4 years ago in reply to Zhao Ma

Prodigy 50 points

Actually nothing said that the part cannot be used in that mode, but the datasheet made no mention of its use that way. Other chipmakers put examples of different use configurations in their literature, so I just wanted to double-check with someone who might have had experience with this part. Turns out that I'll probably be using the TPS560430, but it looks to be very similar. The TPS560200 has a maximum input voltage rating of 17V, and if used as an inverter with a 12V input and -5V output, that would put exactly 17V across that chip. So the '430 gives a margin of safety. Hope it work, I placed a small quantity on order already. Thanks for responding!