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Modifying DC1521A to operate LT3956 in buck / boost mode

Category: Hardware
Product Number: LT3956

I am looking for a WLED driver that can meet the following requirements and I believe the LT3956 would work:

  • VIN: 12VDC-48VDC
  • Vf_max for LEDs: 18.5V
  • I_led max: 1.4A
  • Analog dimming

I have ordered the evaluation board to test it out. The eval kit manual says that "Modifications can be made to the DC1521A in order to convert the board from a boost topology LED driver to any other topology".

Is it possible to get instructions on how to modify the evaluation kit to support a buck/boost operation to the above parameters?

Thanks,

-Mike

  • I updated the provided simulation to match the buck boost reference schematic from the datasheet and I'm unable to run the device in buck/boost with an input of 48V. It appears that the voltage is exceeding 80V on the ISP pin which seems to cause the model to stop switching.

    Before I blow up my evaluation board is this expected behavior? It seems this part is not suitable for this application then.

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