TPS923652: schematic to review

Andrea Falcucci

Part Number: TPS923652

Tool/software:

Hello guys,

made this circuit around the TPS923652.
it should regulate 600mA @ 21Vout.

I am supplying from 8-34V input range.

i have made a quick prototype, and tested on a dummy load at both 8V and 34V (the two extremes...).

In both cases the part fails to make its job. I get a very low voltage at the output (~7v). no 0.2V across the sense resistor. no current flowing on the load.

Can you spot some errors in my implementation ?

thanks

11 months ago

0 Jared Zhou 11 months ago

TI__Mastermind 20515 points

Hi Andrea,

Our expert is OoO and he will reply to you once he is back to office, thanks for your patience.

BR, Jared

0 Steven Li 10 months ago

TI__Mastermind 23150 points

Hi Andrea,

Sorry for the late response.

It seems the LED open load fault protection is triggered. You do not design the OVP resistor divider correctly. Please refer to this E2E FAQ - [FAQ] How to design the OVP resistor divider for TPS923655 / TPS923654 / TPS923653 / TPS923652? - Power management forum - Power management - TI E2E support forums on how to design the OVP resistor divider for buck-boost configuration. (You are using the buck-boost configuration of TPS923652. Am I correct?)

Best Regards,

Steven