TPS54332 output drops when we connect load!!!

Kasirajan Ganapathi1

Other Parts Discussed in Thread: TPS54332

We are using TPS54332 generate 3.3V in the baseboard. when we power on the baseboard and check the output voltage of TPS54332 is 3.34V. but when we put our module into the base board the voltage drops to 2.0V why this is happening ? is the TPS54332 is not able to supply the sufficient current to the module ? the module requires hardly 350mA in 3.3V rail.

The module works without an issues if we power up the module with desktop power supply.

here

i have attached the schematics portion of the TP54332, please let us know what would the reason for this behavior.

No load : 3.34V

with load : 2.0V

Thanks & regards,

Kasirajan G

over 10 years ago

0 NarendraKumar over 10 years ago

TI__Prodigy 250 points

Hi,
may be you can check the 9V supply current limit, or your module loading behaviour, is it 350mA average but pulse of >say 2A or internal OC limit of the TPS54332.

regards,
Narendra

0 Kasirajan Ganapathi1 over 10 years ago in reply to NarendraKumar

Prodigy 40 points

Narendra,

We are using 9V @ 2A power adapter to power the board, so there is no in the 9V supply. module peak current is 400mA & average current requirement is 350mA. this is something to do with TPS54332 section. it's not able to provide current to the load hence the voltage drops & my module is not booting.

Thanks & regards,

Kasirajan G

Power management

Power management forum

TPS54332 output drops when we connect load!!!