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UCC39002: Inquiry about a load share controller

JH Shin
Mastermind 8385 points
Part Number: UCC39002
Other Parts Discussed in Thread: UCC29002,

Tool/software:

Hello,

My customer is looking for a load share controller for a PSU that supports the outputs below.

    - VOUT & IOUT = 12V/8A, 50V/24A dual output

Q1. We can't find any of TI's load share ICs that support 50V. Are there any application notes or reference designs to support PSU 50V output with TI's load share IC?

        If there is a suitable product for load sharing of the above PSU outputs, please recommend it.

Q2. They plan to load share after separating PSU1 and 2 with ORING FET. Is it correct to configure it as shown in the example picture below?

Q3. Is it possible to monitor the current in each channel using the output voltage of IC pin 8 to detect the current in Rshunt?

Thank you.

JH

  • 0
    TI__Expert 5850 points

    Hello JH,

    To reiterate your parameters:

    • Vout: 12V, 50V
    • Iout: 8A, 24A
    • Dual output

    1. Can the UCC29002/UC39002 load share controllers be used for your application?

    Yes, absolutely. There is no problem with Vout = 50V. The only consideration is that you will need a separate bias supply for the UCC29002/UC39002. The Vdd bias should be ideally 5V - 12V. See page 7 of the datasheet for differences between the UCC29002 and UCC39002.

    2. Can you have an ORING FET between the load share controller and the power stage?

    Yes, in fact this is the ideal configuration. See this E2E post for an example: https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1372788/ucc39002-connection-check 

    3. Can you monitor the output current by measuring the voltage across CSO (pin 8) to detect current in Rshunt?

    Yes, I do not see why you cannot do that. Just be sure to measure the voltage across CSO with Hi-Z impedance to ensure you do not disrupt the operation of the load share controller.

    Regards,

    Jonathan Wong