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Hello Gareth,
Please excuse the late response.
I reviewed the schematic with the following parameters in mind:
VIN = 12V to 24V
VOUT = 12V
IOUTmax = 11A
Here the comments to the schematic:
- Peak inductor current is 30A. Please check if the saturation current is high enough for this inductor.
- Please check the voltage on R17 at full load. The voltage drop should be below the minimum value of the sense circuit.
- Please add bulk capacitance at the input. At the moment it seems only ceramic caps are there which will cause issues during startup into the 600+uF on the output.
- The customer is not using the UVLO feature, so the converter will start at a much lower voltage than the 12V which means the whole design would need to be done for this low voltage. Please either digitally enable the device and then add a resistor to GND on the EN pin or use the UVLO function for 11 V at least.
- I would recommend to add placeholders for gate resistors as well as snubbers on Q5 and Q4, in case they are needed.
Best regards,
Brigitte
Hi Brigitte
Thanks you
Peak inductor current is 30A. Please check if the saturation current is high enough for this inductor. Currently I use this inductor to verify (saturation current 25A)
- Please check the voltage on R17 at full load. The voltage drop should be below the minimum value of the sense circuit. OK, it is under 50mV
- Please add bulk capacitance at the input. At the moment it seems only ceramic caps are there which will cause issues during startup into the 600+uF on the output. OK, modified
- The customer is not using the UVLO feature, so the converter will start at a much lower voltage than the 12V which means the whole design would need to be done for this low voltage. Please either digitally enable the device and then add a resistor to GND on the EN pin or use the UVLO function for 11 V at least. OK, modified
- I would recommend to add placeholders for gate resistors as well as snubbers on Q5 and Q4, in case they are needed. OK, modified