Other Parts Discussed in Thread: TPS65261,
Hi,
Customer of mine is using TI DCDCs in their design. The connection is as below:
SMPS (26V) --> TPS54202 (12V)--> TPS65261 --> loads
I have some questions would like to seek your advise:
(1): For EN pin, what is the meaning of “float” (in datasheet pg 3)?
(2): When unplug AC, VIN (26V) to TPS54202 starts to drop. But we observed VOUT goes up again to VIN level. May I know what cause this happen?
The schematic of TPS54202 is as below.
According to EN spec, EN max is 7V, EN falling threshold 1.19 hence by adjusting the EN voltage divider to make the EN voltage lower, the issue can be resolved.
But we don't think this is the proper workaround as it is difficult to make the EN pin level goes lower due to slow discharge of VIN after TPS54202 is fully off.
Please advise.
Thanks