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Posts posted by SupeR-NovA

  1. hi moebious

    if you will wire them in series you will get 18V, and then regulate it down to 5v you will only create more power loss
    if you will wire them in parallel, you could decrease the batteries internal resistance thus making them last a bit longer...
    I wpuld suggest you to wire only one battery, and if you need more Ah get some stronger battery (a 12v car battery)


  2. Hi all, sorry for not replying... have been away for some time..

    I am using a dual 12v seperate switching supply. one of the outputs is for the UC3843 and fan. the other is for secondary side supply.
    So does the usage of the seperate supply mean that i can reduce the output down to 0v and not use a resistor in parallel to draw minimum power from the supply?

    this will sound a bit stupid.... if a core is saturated, will turning power of discharge it, or the core is lost for good?  ???

    it's hard to comeby an LDO with 5A output capabillity... so i'll ommit it and use a secondary output inductor...

    a few things i'm not certain of...
    1)is the EER42 transformer a good choice for this design? and how much current can i draw from it safly at 100Khz?
    2)is the output inducter 300uH 6A value OK?
    3)are the output filter capacitors 470uF 50V values OK?
    4)is R3 current sesnsing resistor (0.33ohm) at current sensing pin of UC3843 value correct?

    i'm almost finished just a few thouchups and that's it!!!


  3. Hi all!
    I'm designing a switching bench PSU around the UC3482 controller.
    this PSU will be adjustable between 1v-30v and currnet limiting will be from 30mA to 5A.

    my first question is, how can current limitting be better implemented?
    WITH SOFTSTART' as described in figure 19 of the SG3842 datasheet.

    another way is using a 0.1ohm 5W resistor in series with the output and sense the voltage drop across it.

    the last one i can think of is a current sensing transformer, but i'm not to familiar with this solution so i would need help about it...

    so which way is better?

  4. Hi to you all
    first i would like to say that i'm new here, and this site & forum are great!

    I would also like to build this PSU, but i want to make it DUAL.
    in order to reduce cost/dimentions i would like to know if i can share the whole
    area within the red line...
    if not, please tell me which compenents I can't share

    P.S. if there any more sharable components outside the red line please do tell me


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