Resistor values for HCPL2630

Discussion in 'The Projects Forum' started by jm-a, Dec 12, 2010.

  1. jm-a

    Thread Starter Active Member

    Oct 20, 2010
    105
    2
    Hi all

    I need to drive an IR2130 with HCPL outputs , and i have a few queries about it.


    Question 1:

    it's only for MC33035 Top drive outputs and Led.

    About HCPL otpo , what's the best choice, A or B, and why, only cost and place on board ?
    See " Choix-Resistances-HCPL2630-150x150.png "

    Question 2 :

    Now about MC33035 bottom drive output ( pin 19, 20 ,21 ) and HCPL Led.

    Bottom drive output values : High level 12,9 -----> 13 V
    Low level about 2 V Maxi

    Vf for this Led is 1,5V
    If = 15 mA maxi for High level
    If = 250 μA Low level

    Must i need to add 1N 4148 to be lower than 250 μA?

    I made ohm's law and found for only one resistor of 1500 Ohm:

    ( 2 -1,5) / 1500 = 333 μA from which question above.....

    Question 3:
    Is it mandatory to use a dc/dc converter to power HCPL2630 , or 7805 output will do the job?


    Thanks a lot, if anyone could reply me.....

    jm
     
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