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Type: Posts; User: SimonPoon

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  1. Closed: Did synchronous rectifier has other function?

    Hi folks, I have designing the flyback SMPS using on-semi ic NCP1937 and reference to EV board DN05044 ( http://www.onsemi.cn/pub/Collateral/DN05044-D.PDF ) to develop my design.
    There have 3 parts...
  2. Closed: Re: The Mosfet is burned and current sense resistor sparking

    Thanks Nagle and betwixt explanation and suggestion, I will try to modify it and trace the problem step by step.
    Beside, I want to ask how can I know that is it relate to snubber? how can I know the...
  3. Closed: Re: The Mosfet is burned and current sense resistor sparking

    Thanks your comment, since I want to step by step to develop the smps, so I based on the evaluation board to start develop, In the beginning, you are correct, to observe much clear, I modify the...
  4. Closed: The Mosfet is burned and current sense resistor sparking

    Hi all,
    I have to design the 30V SMPS (the SMPS goal is 30V 7A) using On-Semi NCP1937 and NCP4355 to form a flyback SMPS. For the first try with no load, it is ok, voltage is shown 30V, then...
  5. Closed: Re: The Ground termination between comparator and the load

    Really much thanks for your help, I had learn so much for your reply, I will try to find a match op amp based on your advise to achieve the design. Thank you!
  6. Closed: Re: The Ground termination between comparator and the load

    Hi Klaus, correct, the FET on/off is used to let user control the battery on and off or any fault condition to cut the power, the battery will sleep to save battery when idle a few minutes, but this...
  7. Closed: Re: The Ground termination between comparator and the load

    Thanks for your reply, maybe my explanation no good. Actually what my need of my product is: when the load(motor) start operate, the MCU wake up, that's it, no need to measure the current value,...
  8. Closed: Re: The Ground termination between comparator and the load

    Thanks andre and FvM's advise, does it mean I can't use this op amp to achieve my design? or I need to use pure comparator instead of op amp better?
    Beside, I had a brainstorm, how is the position...
  9. Closed: Re: The Ground termination between comparator and the load

    When Q1 is turn on (common to ground) and the motor is start to load, there have a sense signal come from the shunt, and the op amp get the signal to trigger the MCU. Those operation is work...
  10. Closed: The Ground termination between comparator and the load

    Hi all, I have face a problem for measure the current load by comparator, below is the block diagram for our product, it's a battery product.

    We have a Q1 to control the battery on off by MCU,...
  11. Replies
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    Closed: The SMPS design selection

    Hi all, I am a newbie of the electronic, Since I need to design the SMPS with high power with high voltage, may I get some suggestion for designing the SMPS? here is some requirement for the SMPS:
    ...
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