We have a shared current design using the LMZ31710 to generate 0.83V @ 10A. I have an issue with some of the boards that the PG# signal oscillates at 200KHz - selected switching frequency. The load is very small on powerup. We have followed the reference design for current sharing. Some boards work fine. On one of the boards, the 0.83V output is stable but the PG# signal is oscillating at 200KHz. We have varied the value of the soft start capacitor but this has not helped.
INH/UVLO is floating.
STSEL tied to ground.
VADJ is 3.74K tied to ground. Master and slave tied together.
ILIM is floating.
OCP_SEL is floating. Master and Slave tied together.
SS/TR floating. Have tried 4.7 and 33nF capacitors.
Master - RT/CLK floating. Slave - RT/CLK tied to Master SYNC_OUT.
ISHARE tied together between Master and Slave.
