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Nonlinear Start-up waveform of LTC7801

Question asked by minc on May 18, 2018
Latest reply on May 18, 2018 by minc



I was testing LTC7801 with Vin = 54V. Vo was set to 60V. 7801 was operating with 100% duty ratio. L = 1uH. fsw = 250kHz.

I observed that with no load or a light load, the vout waveform during the start-up was linear and expected. But if powering up with 2A or higher, the Vout waveform looked non-linear. Please see the attached two waveforms with 1A and 2.5A load current respectively. I was wondering the reason and how to fix this issue. Thanks!