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TPS51120: 5V CHANNEL-1 OUTPUT GOING LOW

Part Number: TPS51120

Circuit for design of regulation using TPS51120 is similar to the datasheet. It is working in 2 of the boards.

But in 3rd board, CH-1 output of 5V is generated for 100msec and is dropping to 0V.  EN1 is still high during this time and PGOOD1 is going low.