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LM5118: Can LM5118 be used in a open-loop state?

user6022484
Prodigy 65 points
Part Number: LM5118

Since my application is used in a constant 24V input voltage, can LM5118 be used in a open-loop condition?

  • 0
    TI__Guru* 78400 points
    Hi Ziyue,

    Thank you for considering the LM5118. I am afraid the answer is no if you want to get a regulated output voltage, because in open loop the duty cycle cannot be controlled to regulate.

    Thanks,
    Youhao Xi, Applications Engineering
  • 0 in reply to Youhao Xi
    Prodigy 65 points
    Hi Youhao, thank you very much for your reply. If I don't have needs for regulation of output, can I used it in open loop?
  • 0 in reply to user6022484
    TI__Guru* 78400 points
    Hi Ziyue,

    If you don't need output regulation, why select the LM5118? I would not recommend the LM5118 in open loop application because you cannot predict the output voltage and it can be very excessively high to cause damage.

    If you just want to step up, you can choose the LM5020-2 which has fixed 50% max duty and you can tell you output would be 2x Vin. If you want to step down, you can also use the LM5020-2 with 50% duty in a flyback configuration and set the output by a transformer.

    Thanks,
    Youhao