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UCC24612: standby current

Fred Cheng
Expert 5120 points
Part Number: UCC24612
Other Parts Discussed in Thread: TIDA-010015, UCC24624, , UCC28064A

Hi team,

my customer has a very strict power saving spec at tiny load (120mW, 24Vout)

they're using TIDA-010015, and the measurement result Pin is 296mW, which is 10mW above their spec,

While I was looking where can I improve the power loss,

 I notice the standby current of UCC24612 is much higher than UCC24624's,

May I know how much current can we save if we use UCC24624 to replace two UCC24612 in  VDD "24V"  ( since datasheet only has 5V and 12V)

 please give me a range (min and max)

thanks

  • 0
    TI__Expert 7080 points

    Hi Fred,

    The standby current will not dramatically changed (almost the same)when VDD voltage at 5V/12V/24V. but the power consumption will be different at different VDD voltage . assuming VDD voltage at 24V , the power consumption will decrease  around  24V * (390ua *2 -180ua) = 14.4mW. If you use a UCC24624 to replace two UCC24612s

    But there are also other methods to help reducing 10mW input loss:

    1. Increase the BLK sense resistors value on UCC25630. Vgs parallel resistors R44 R45 etc.

    2. Minor increase the burst mode threshold of UCC25630.

    3. Increase the HV sense resistors on VSENSE / HVSEN/ VINAC surround UCC28064A.

    Thanks.

  • 0 in reply to Jaden Ning
    TI__Expert 5120 points

    Hi Jaden,

    since there's a variation(max and min)  in two device standby current there,

    so the minimum power we can save is supposed to be (200x2-110uA)x24V=7mW

    while maximum is around 28.5mW, right?

    Regards,

    Fred

  • 0 in reply to Fred Cheng
    TI__Expert 7080 points

    Hi Fred,

    In theory, Your calculation is right.

    Thanks.