TPS28225: Power management forum

Neil Levine

Part Number: TPS28225

I'm using the TPS28225 to drive MOSFETS to pulse an inductor through a cap, resonant frequency about 75kHz. As I raise the MOSFET source V up towards the target, I begin to see some higher frequency oscillations at the switch node which look like hash on the switch node voltage, shortly followed by the destruction of the TPS28225. This has happened a couple of times. What can I do to mitigate this issue in this circuit? Any suggestions would be appreciated. By the way, I do not see anything like this on the attached simulation circuit. - Thank You.

over 2 years ago

0 Richard Herring over 2 years ago

TI__Mastermind 23105 points

Hello Neil,

Our expert on this part is out of the office at the moment. They should respond to your questions within the next business day.

Regards,

+1 Alex Weaver over 2 years ago

TI__Intellectual 2100 points

Hi Neil,

The team actually has a technical article available on reducing switch-node ringing: Link

The article examines three different methods to help reduce switch node ringing: a boot resistor, an external gate resistor, or adding an RC snubber circuit. The article helps explain how to implement these dampening methods as well as their effect on ringing and system efficiency.

Please let me know if you have any questions, or if you are still experiencing severe oscillations at the switch node.

Best,

Alex W

0 Neil Levine over 2 years ago in reply to Alex Weaver

Prodigy 10 points

Thank you, I tried some of the suggestions in the article which helped fix the problem I was having.