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TPS54360B: Review the schematic diagram of TPS54360B

jeno.zhang
Expert 2885 points
Part Number: TPS54360B

Tool/software:

hi，

The customer is using TPS54360B for an output voltage of -15V, an output current of around 0.5A, and an input voltage of 24V. Please help review the schematic diagram. Thank you!

  • 0
    TI__Expert 5490 points

    Hi Jeno,

    I will get back with comments by end of today.

    Thanks,

    Nitya

  • 0 in reply to Nityanand Hegde
    TI__Expert 5490 points

    Hi Jeno,

    I have few comments.

    1. If you need EN connection, recommend you to refer snva856b app note section 7.1.

    2. The compensation values are incorrect. I think the values for snubbers are just copied for compensation values as well. Depending upon the cross-over frequencies the Rcomp, C_comp values will vary.  recommend you to refer excel tool SWIFTINV-CALC 

    3. With existing inductance value, the ripple is higher. The recommended ripple value is 40%(generally) of load current. So the Inductance value will be around 150uH.   

    Thanks,

    Nitya

  • 0 in reply to Nityanand Hegde
    Expert 2885 points

    Hello，

    Question 1：As shown in the schematic above, is the RT/CLK pin connected to -15V or ground through a resistor? The GND pin of the chip is now connected to -15V, as shown below, which I don't quite understand.

    Question 2：According to the schematic design, there is currently no voltage output. Please help analyze possible reasons.

    Thanks!

  • 0 in reply to jeno.zhang
    TI__Expert 5490 points

    Hi Jeno,

    Answer 1 : In inverting buck-boost the -Vout is the reference voltage and hence all the internal pins like RT, COMP, FB are tied to -VOUT node. 

    Answer 2: Recommend you to check VIN, SW and -OUT waveforms for debug.

    Thanks,

    Nitya