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Power isolation solution

Hailey Chen
Expert 3310 points
Other Parts Discussed in Thread: SN6507

Hi, team:

    I want to design a system with isolation power, Could you help suggest suitable device and solution?

    technical need:

    Vin =20V 

    Vout =+5.5V, +4.2V -5.5V, 

    Each output current within 1A,

    Could you help suggestion suitable device could support? Smaller size, lower ripper will be more appreciate.

    Hope to get your reply, thanks a lot.

   

  • 0
    TI__Guru 55885 points

    Hi Hailey,

    Thanks for reaching out.

    One solution you could think of is using SN6507. The device supports 0.5A input current and hence, the max input power would be limited to 10W when input voltage is 20V. This means that you could have approximately 8W of output power under worst-case conditions. If this meets customer power / current requirements, then they could consider this device.

    I will also notify power supply product group about your request to see if they have any other device suggestions, thanks.


    Regards,
    Koteshwar Rao

  • 0
    TI__Expert 3310 points

    Hi, Rao：

        Very thanks for your suggestion

  • 0 in reply to Hailey Chen
    TI__Genius 10595 points

    Hello Hailey,

    Thank you for reaching out. 

    Since each output is 1A, is the total power of the system 15.2W? If so, I would recommend the UCC28C59 in a flyback with multiple outputs. This product also has many variations (such as an automotive equivalent) and an EVM to help with your development.

    If a lower power system is acceptable, I would recommend the UCC25800. It is a fully integrated transformer driver and will thus fit your small size requirement. It has an EVM for easy hardware development and has existing reference designs, such as the PMP40980, that show a multi output system.

    You can further look through the PWM controller selections available at TI here: https://www.ti.com/power-management/acdc-isolated-dcdc-switching-regulators/pwm-controllers/overview.html 

    Regards,

    Jonathan Wong