• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 2 answers
  • Subscribers 65 subscribers
  • Views 482 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM5022-Q1: LM5022 Question

Kuo John
Expert 1075 points
Part Number: LM5022-Q1
Other Parts Discussed in Thread: TPS40210, LM5022, TPS40210-Q1,

Hello TI,

I have question about TPS40210 & LM5022 output vpltage capbility.

Why LM5022 just can operation output voltage up to 300V? and why output voltage minmum is 1.25V?

According to maximum duty 90%,
VOUT / VIN= 1 / 1 - D, where VIN 60VDC, D 0.9
VOUT around 600 VDC, Right?


TPS40210 just can operation output voltage up to 60V? and why output voltage minmum is 6.4VDC?

According to maximum duty 95%,
VOUT / VIN= 1 / 1 - D, where VIN 52VDC, D 0.95.
VOUT around 490 VDC, Right?

　 TPS40210-Q1 LM5022-Q1
Vin (Min) (V) 4.5 3
Vin (Max) (V) 52 60
Vout (Min) (V) 6.4 1.25
Vout (Max) (V) 60 300
  • 0
    TI__Mastermind 40080 points
    The expert for this part is on biz trip. He will answer your question after back to office. Please wait in patient.
  • 0
    TI__Intellectual 2645 points
    Hi John
    we should consider loss and parasitic, output will be smaller. In theory, if you choose a MOS with VDS higher enough, you can get output higher than 300V, but for application, we do not recommend it.
  • 0 in reply to Jing Ji
    Expert 1075 points

    Hi Jin,

    Another question is output voltage. could you help reply me? thanks.

    Regards,

    John

  • 0
    TI__Mastermind 21720 points

    Hi Kuo,

    Since both the LM5022 and the TPS40210 are non-synchronous low-side switch controllers the output voltage can be very high, as long as the input voltage range or the absolute maximum voltage rating are not violated. This means that the output voltage could be very high ans still operate properly. These devices can be used in multiple configurations (SEPIC, Flyback, Boost...). There will be a duty cycle limit, as you mention above, for each of these configurations and will be determined by the input voltage range.

    The minimum output voltage is referencing to the FB pin reference voltage. If the output is tied directly to the FB pin then the output will be that voltage.

    Thanks,

    Garrett