Hi
My customer has used TPS54295 for current production models and they are now considering TPS542941, TPS54394 and/or TPS54395 for next models.
When they designed with TPS54295 last year, they had seen the problem that TPS54295 can not recover from UVP situation due to the instant voltage drop of Vin.
(When instant voltage drop of Vin occurred, Vout goes below the threshold of UVP and TPS54295 shut off swithches. However, in customer design, EN is connected to Vin via resistor, then the voltage of EN was NOT discharged enough during instant voltage drop (remain high). As a result, even though Vin was recovered, TPS54295 still stayed in UVP mode.)
For new models, I have explained that TPS542941, TPS54394 and/or TPS54395 have different protection mode, called Hiccup mode, so same problem can not be expected. However, in order to proof this, customer would like to check the waveforms from actual device evaluation.
Do you have any good waveforms which can clearly show different protection behavior of these devices?
TPS54295: latch off
TPS542941, TPS54394 and TPS54395: Hiccup mode
Thank you for your support in advance.
Regards,
Ken