TPSM63608: problems operating the device

Yonatan Zohar

Prodigy 20 points

Part Number: TPSM63608

Hello,

I used TPSM63608 for a new design and i have difficulty to see any output from the device,

The EN pin is powered by 3.3V input,the input voltage is 24V and the desirable output is 12V.

after few tests i have found:

PG is low(0v)
VLDOIN is 0V
VOUT pins are 0V
trying to tie VLDOIN to GND did not help
trying to tie VLDOIN to VIN did not help

After all those tries i wasn't able to see and output.

See the circuit below :

12 months ago

0 Ridge Lahti 12 months ago

TI__Mastermind 18465 points

Hello,

Overall the schematic looks OK. R80 should be disconnected. There is no need for a pulldown resistor on the PG pin. If your design needs lower voltage than the 24V pullup, you could pull up the PG pin to VCC.

What is happening on the SW node when you see this issue?

Best regards,

Ridge

0 Yonatan Zohar 11 months ago in reply to Ridge Lahti

Prodigy 20 points

Hello,

on SW i see some square wave:

0 Ridge Lahti 11 months ago in reply to Yonatan Zohar

TI__Mastermind 18465 points

Hello,

I notice on your schematic that the SYNC/MODE pin is tied to GND with a 0-ohm resistor. A resistor value in the 100k range is recommended. Also, can you confirm the EN voltage level that you measure during this condition?

Best regards,

Ridge

0 Yonatan Zohar 11 months ago in reply to Ridge Lahti

Prodigy 20 points

Hello Ridge,

I have found the problem - In the footprint I used the pads of Vin/Vout was covered with solder mask-after removing and resoldering the device all works fine

Power management

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TPSM63608: problems operating the device