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  1. #1
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    help schematic.. pic mcu pwm out controlling LM2576 or LM2596 0-25VDC

    i need simple but stabil adjustable DC 0-25v 3A or 5A support supply schematic for my 24v dc motor.
    i dont want to use for control the motor with any buck boost converter becaouse motor cable wil be long(3meter) to control board.
    For that reason i want to control my dc motor voltage range 0-25 dc with out voltage of lm2576 it has suport 3A or lm2596 has support 5A(it is better)
    i want to use picf16877 pwm out to change regulator out voltage
    but my analog electronic level is not enough to modify lm2576/lm2596 with my own self op-amp knowlege
    so why i want help from you.
    thank you .

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  2. #2
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    Re: help schematic.. pic mcu pwm out controlling LM2576 or LM2596 0-25VDC

    For starters: What is the DC input voltage range?

    Most modern micros are capable enough to implement a switchmode topology without requiring a LM2576. But you will definitively require an external Power fet, a fet driver IC, and external current sensing.
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  3. #3
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    Re: help schematic.. pic mcu pwm out controlling LM2576 or LM2596 0-25VDC

    input voltage wil be 24v dc or 30vdc by other lm2596 circuit(on market)
    i will control 3 motor(selectable) with only one pwm outand one adjustable lm2596 voltage source
    3 motor will never run in same time together.



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  4. #4
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    Re: help schematic.. pic mcu pwm out controlling LM2576 or LM2596 0-25VDC

    Hi,

    I don't understand your requirements.
    I read you don't want to use a buck converter, but LM2576 is a buck converter.
    And I don't understand what cable length has to do...

    Please draw a sketch of what you need.

    Klaus
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  5. #5
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    Re: help schematic.. pic mcu pwm out controlling LM2576 or LM2596 0-25VDC

    i dont want to make my own a buck converter with external mosfet ,inductor and control current and voltage with pic mcu



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  6. #6
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    Re: help schematic.. pic mcu pwm out controlling LM2576 or LM2596 0-25VDC

    Hi,

    In another post you referred to this: https://www.edaboard.com/showthread....output-voltage
    As far as I can see this is exactly what you need. What's the problem with it?

    Klaus
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