LM5175: LM5175PWP

Jag Kundhi

Part Number: LM5175

I've recently designed a DC-DC converter based on LM5175 using WEBENCH. Having built boards. I find the Output of the VCC bias regulator is around 7.5v when EN/UVLO is below 1.23v but drops to around 3.5v at higher voltage (and has a ramping waveform). Can anyone suggest why this might be happening?

over 6 years ago

0 Youhao Xi over 6 years ago

TI__Guru 73560 points

Can you show the waveform?

0 Jag Kundhi over 6 years ago in reply to Youhao Xi

Prodigy 55 points

Many thanks for replying. Waveform shows how VCC pin voltage drops from 7.5v to nominal 3.5v with sawtooth waveform.

0 Garrett Roecker over 6 years ago in reply to Jag Kundhi

TI__Mastermind 21720 points

Hi Jaku,

Can you provide the schematic and the application specifications? If you cannot share online please let me know and we can work offline on this issue.

Thanks,

Garrett

0 Jag Kundhi over 6 years ago in reply to Garrett Roecker

Prodigy 55 points

Hi Garrett, can I send schematic/gerber data offline? Thanks.
Jaku

0 Garrett Roecker over 6 years ago in reply to Jag Kundhi

TI__Mastermind 21720 points

Hi Jaku,

I've sent you a connect request. I'm going to close this thread.

Thanks,

Garrett

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LM5175: LM5175PWP