In our application, we want to add a delay of more than 100ms in en, so c289 is adjusted to 10uF, 4.7uf, 10uF (170ms) results in tps2491 not starting, MOSFET is not turned on, and c289 can start normally when c289 is 2.2uf.
1、Please help to analyze the reason?Why does the delay of EN cause tps2491 start failure?
2、 How can I start tps2491 with a delay of more than 100ms-200ms。
3、The first waveform figure shows 48V input and EN waveform, where yellow is EN. The second figure shows 48V output and gate voltage, where yellow is gate voltage andC289 is 10uF。
