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SN6501-Q1: 5V input, 12V Vout, Iout= 200mA transformer recommendation

Part Number: SN6501-Q1
Other Parts Discussed in Thread: SN6501, SN6505B, SN6505B-Q1

Hi Team,

There is customer use SN6501-Q1 for isolation power supply in vehicle. Here is the application scenario:

Input Voltage: 5V

Output voltage: 12V

Output current: 200mA

After SN6501, there is a wide input(4.5~45V) LDO. Could you recommend a transformer for customer? Thanks.

BR

Songzhen Guo

  • Hi Songzhen,

    Thank you for posting to E2E!

    At 5V operation, the SN6501 can only drive up to 1.75W of power transfer across an isolation transformer; it will not be able to supply 200mA to a 12V rail.

    The SN6505 devices, like the SN6505B, can drive up to 5W of power transfer across an isolation transformer. For a regulated 12V rail, transformers like Würth's 750316818 and 750343725 or Coilcraft's DA2303-AL in a voltage-doubling configuration can be used.


    These suggestions might not meet our customer's size, performance, or cost requirements. To select a more tailored part, please confirm our customer is willing to use SN6505 and share a schematic or part numbers of the diodes and LDO to be used.


    Respectfully,
    Manuel Chavez

  • Hi Manuel,

    Thanks so much for your feedback.

    SN6505B-Q1 was chosen for customer's project.

    They need a transformer meet AEC-200. Do you know this kind of transformer? Thanks.

    BR

    Songzhen Guo

  • Hi Songzhen,

    Thank you for confirming this.

    DA2303-AL and DA2304-AL from Coilcraft are AEC-Q200 qualified and can be used in the configuration below for 12V output:



    For higher margin to compensate for unknown LDO and Schottky diode voltage drops, please recommend DA2304-AL if this configuration is used. Otherwise, please do share the LDO and Schottky diode part numbers with me, and we may be able to recommend a transformer that can achieve 12V output in the typical configuration.


    Best,
    Manuel Chavez

  • Hi Manuel,

    Thank you so much for your help.

    I will ask a new question for other customer.