TPS54335A: TPS54335

Ian Wang

Mastermind 30040 points

Part Number: TPS54335A

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.

over 5 years ago

0 Gerold Dhanabalan - High Performance Radar over 5 years ago

TI__Genius 14455 points

Hi Ian,

Can you please confirm if Vout is regulating correctly under no load and full load - without applying a load transient?

Regards,

Gerold

0 Ian Wang over 5 years ago in reply to Gerold Dhanabalan - High Performance Radar

TI__Mastermind 30040 points

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.

0 Ian Wang over 5 years ago in reply to Ian Wang

TI__Mastermind 30040 points

Hi Guys,

Do you have any idea for this customer issue?

Thanks, Ian.

0 Ryan Hu (BSR-MV) over 5 years ago in reply to Ian Wang

TI__Expert 4035 points

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.

0 Ian Wang over 5 years ago in reply to Ryan Hu (BSR-MV)

TI__Mastermind 30040 points

Hi Ryan,

Layout for reference,

0 Ryan Hu (BSR-MV) over 5 years ago in reply to Ian Wang

TI__Expert 4035 points

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.