converter

Discussion in 'The Projects Forum' started by blue gal, Mar 1, 2010.

  1. blue gal

    Thread Starter New Member

    Mar 1, 2010
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    hello,i am acually constructing a SEPIC converter for photovoltaic application ...i would like to know if 555 timer is suitable to use to drive the pulse width modulation or its better to use PIC microcontroller..thanks
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You might use a 555 timer, but your parts count will be higher than with a PIC.

    Have a look at a PIC12F683 uC. It's an 8-pin DIP uC with built-in PWM, ADC and comparator with 2k flash program memory.
     
  3. blue gal

    Thread Starter New Member

    Mar 1, 2010
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    doest the 555 timer support up 50khz frequency ...
     
  4. blue gal

    Thread Starter New Member

    Mar 1, 2010
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    another thing i hv want 2 get constant 9v output with 6v-12v input.i dont know how to design the pwm circuit as well
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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    Many 555's can operate much higher than 50kHz.

    Well, you mentioned SEPIC topology. Have you research that at all?

    You need a buck-boost converter. You say you want a constant 9v output, but at what current?
     
  6. blue gal

    Thread Starter New Member

    Mar 1, 2010
    4
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    1A current....
     
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