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TIDA-010015: Standby mode control via MCU

balasubramani r
Expert 1170 points
Part Number: TIDA-010015
Other Parts Discussed in Thread: UCC28064, UCC256301, , UCC28064A

Hi Everyone !!

How to control standby mode in UCC256301 and UCC28064 IC via MCU?

I Will measure the load current if this is not more than 5%(assuming light load) of its full load then this system should go to standby mode so that losses will be minimized (heat,switching,EMI). 

Apart from inbuilt Burstmode in PFC is there any other mechanism is there i could use?

Please feed some input here..

  • 0
    TI__Expert 3295 points
    Thank you for your interest in TIDA-010015, I have forward you question to our designer, he will reply to you soon.

    Best Regards,
    Ryan
  • 0
    TI__Intellectual 2815 points

    Hi Balasubramani,

    What is the standby power you are targeting? If it is less than 200mW no need for external disable.

    If you want to shutdown the power stage to have the lowest possible power consumption. I suggest that you can pull down the Vsense pin of the PFC controller. It will shutdown the PFC controller and LLC will also turn off when the bulk cap voltage falls below the threshold.

    For 5% efficiency improvements. Booth the PFC and LLC implement Burst mode and give good efficiency. For further efficiency improvement, I suggest to adjust the LLC burst power levels. 

    Best Regards,

    Ram

  • 0 in reply to Ramkumar S
    Expert 1170 points
    Hi Ram,

    Our requirement is when system not connected with LOAD we need to minimize the switching losses and heat losses by forcing the system into standby mode at the same time output should be available at the smps.

    Here MCU will do all the process, So un interrupted power should be delivered in smps with standby option required.

    here standby means less activity inside the PFC and LLC circuit.

    If there is any option available pls let us know.
  • 0 in reply to balasubramani r
    TI__Expert 3860 points
    Hi Balasubramani,

    With the burst mode available with both UCC28064A and UCC256301, you can achieve a standby power less than 200mW. This is one of the better standby performances possible with similar type of devices. To reduce further from this value, you may have to switch off the PFC completely.

    Regards,

    Salil