HO pin does not turn on

Don Keuth

Hi TI,

I test my circuit as shown above and find that the HO pin does not turn on when the HI pin is high. Therefore, I need your help.

Thanks,

Don

over 9 years ago

0 Brian Johnson96 over 9 years ago

TI__Expert 3200 points

Don,

I will have an AE to help answer your question.

0 Wei Zhang over 9 years ago

TI__Intellectual 2061 points

Hello Don,

For your information, the HO, in this bootstrap configuration, only works when you also switch in LO, and that is how the Bootstrap cap get charged. Did you also turn-on the low side FET? If not, could you please also apply signal in LI?

If you applied LI and There is still no HO, could you please help catch waveforms in HI, LO, HO, SwitchNode, all referenced to driver VSS? and let me know if you have further questions.

Wei

Power management

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HO pin does not turn on