Other Parts Discussed in Thread: TPS65235-1, TPS65235
Tool/software:
Hi,
We are using TPS65235-1/3 in around 500 systems and multiple systems are having failures either in the LNB or in the TPS65235 IC.
Many of the failures of the IC include the output voltage going to ~16.5 volt (we are setting it to 12.8V), in few cases the output is shorted to GND.
For catering the LNB issue we are testing at our lab, but also, I am putting the surge components as mentioned in the datasheet, which were not mounted initially.
For IC failures, I am suspecting the layout, specially the location of inductor (L5 here) and the thin trace going to pin 2 and 3.
Can anyone please review this layout and schematic and tell me if I am missing something.
In current configuration, L5 is 4.7uH. DZ4 and DZ5 (surge related components) are not present, D14 is not present.
We have 2x22uF capacitors at boost pin (datasheet says one is enough with 4.7uH) and the package is 2220 with voltage rating of 50V.
Any help in diagnosing the issue or recommending changes to current configuration are welcome.
Thanks.
