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LTC3888+LTC7051 voltage ramp-up issue

Category: Hardware
Product Number: LTC3888

We use LTC3888+5*LTC7051(4+1) in our design. In general, it works well in normal operation.

However, we found there is an unexpected pulse at the beginning of the voltage ramp-up as below:

CH1(Yellow): Voltage   CH2(Green): Run Signal  

Zoom-in waveform:

The pulse width Is about 80us,and amplitude is about 330mV. 

The schematic is as below:

PDF

This pulse happens every time on both channels. Is it normal?  Any methods to eliminate it?