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Part Number: TPS54290
Hi, We are using TPS54290 in our design and using it as Dual output source ( 1.8V and 3.7V respectively) .
PVDD1 and PVDD2 are shorted and fed by 12V supply.
Default EN1 and EN2 are pulled down.
After turning on input PVDD1=PVDD2 = 12V . We are getting Out 1 around 1.48-1.9V on 5 boards we tested( should be 1.8V as R1 /R2 at FB1 are 20K/16K) .
But major issue issue is with Out 2 . we are getting around 1.77V - 2V range on 5 boards we tested. (should be 3.7V as R1 /R2 at FB2 are 33K/9.1K) .)
Is there any sequencing required for EN1 and En2 ( EN2 should come before EN1) in case when we have PVDD1 and PVDD2 tied together?
Can you post your actual schematic? Can you provide waveforms showing SW1 and SW2? You should be able to assert both EN simultaneously. Make sure the PVDD rise time is faster than the SS time.
BSR-CCP LV/MV DC/DC Applications
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