Hi Sir,
Pls kindly hep for question for TPS54335, thanks.
When we test TPS54335 with load change from 0A to 3A suddenly, Vout is drop, then TPS54335 w/o output.
Pls advise if maybe something wrong here? Thanks.
Thanks, Ian.
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Hi Sir,
Pls kindly hep for question for TPS54335, thanks.
When we test TPS54335 with load change from 0A to 3A suddenly, Vout is drop, then TPS54335 w/o output.
Pls advise if maybe something wrong here? Thanks.
Thanks, Ian.
Hi Ian,
Can you please confirm if Vout is regulating correctly under no load and full load - without applying a load transient?
Regards,
Gerold
Hi Gerold,
Let me describe how we test,
1. connect electric LOAD to IC o/p, then with LOAD.
2. Power ON system
3. Observe voltage status when Power On moment.
The same experiments are no problem in no load(0A) and half load(1.5A)
But it drop when with full load (3A)
Do you have idea what happen?
Thanks, Ian.
Hi Ian,
How about with a lower output current like 2.8A? Did the Vout ramp up again after the first drop down to zero? If ramp up, please capture the waveform and measure the hiccup time.
Schematic looks ok. Please provide the layout snapshot if possible.
Hi Ian,
It's hard to read the layout. From the picture i don't know if any copper connected to the IC for the power dissipation, also i haven't found some components shown in the schematic.
Firstly, I suggest to double confirm if the device was in OTP. Need your comments to my above questions. How about with a lower output current like 2.8A? Did the Vout ramp up again after the first drop down to zero? If ramp up, please capture the waveform and measure the hiccup time.
Hi Ian,
It looks like a over temp protection. Could you please have a check with a FAN cooling the IC?