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TPS54560-Q1: Need help on circuit design/debug

Yichuan Ding
Prodigy 10 points
Part Number: TPS54560-Q1

Hello,

I built a test board for TPS54560-Q1 base on schematic below.  and when I power it on, the output voltage is < 1V.

I want to konw what is the reason it behaves this way. I checked every connections, the voltage on pin EN is 8.2V. Could that be the missing inductor at the output terminal?

  • 0
    TI__Mastermind 23815 points

    Hi,

    Yes the inductor is an important part of the circuit, it is used as the energy storage element for the buck converter. 

    This might be a good staring point for your design
    https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=CD500045E6A422F1

    Also keep in mind that your diode is not a schottky diode. For the circuit to work you may want to substitute that with a schottky diode. 

    Thanks

    -Arief