bq24600 gate driver problem.

Q: bq24600 Low Side gate driver problem.

The waveform of gate drive has some problem during light load (under 1A) and there is no problem over 1A load.

Vin=12V, Vout=8.4V, Iout=Max 2A. board=customer board.

Question:

1. What made this low side gate drive waveform during light load (under 1A)?

2. Is there any problem in the schematic?  I think there is no problem.


Q: Re: bq24600 gate driver problem.

The low side drive is disable (disables synchronous mode operation) if the inductor current gets too low to prevent reverse conduction.  This is often done where the output is a power source (battery) so the converter does not go into boost mode.