3 12V to 6V buck converter using 555 timer IC

This  buck converter is driven by 555 timer IC and converts 12V dc from a battery to 6V dc. The 555 IC  (operated in astable mode ) generates pulses of voltages of 50% duty cycle. This pulses turns the transistor on and off and drives the inductor L (buck converter circuit), and as a result generates 6V dc output. For this configuration,
Ra =18K
Rb =18K
C =10nF
Q = TIP41C or any of the same specs
Cout = 2200uF (higher the better)
L= 40 turns #22AWG magnetic wire on antenna bar
For better regulation, you can add zener diode (1N5233B) across  the output.


converter schematic



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3 comments:

  1. patrick vazAugust 21, 2011 at 3:06 AM

    Hello Sir,

    Thanks for the 12v to 6v buck converter, could u also post the value of "L".

    Thanks

    ReplyDelete
  2. DH-gmAugust 22, 2011 at 6:57 AM

    Inductance l is more than 100uH, the higher the better.
    Or just wind 40 turns of #20AWG magnetic wire in an antenna bar.

    ReplyDelete
  3. FabAugust 25, 2012 at 5:45 AM

    Thank you very much

    ReplyDelete

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