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!
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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!
Hi Jeno,
I will get back with comments by end of today.
Thanks,
Nitya
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
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!
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