Little help needed to understand Dimmer for DC lamp?


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  1. #4
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    From what you said, Duty cycle value should be from 0-255 (255 Full power)
    Yes.

    Channel will be the Port on which the lamp will be connected.
    Where you connect the interface, that drives that lamp.


    What will be the frequency?
    I have indicated 20 KHz (20000) but you should experiment variuos frequency and choose the one that gives you the best result. Remember that frequency must be the same for both channels. Refer to the table @ page 74 of PBP manual for max & min frequency available.


    Also the circuit you mentioned, can it work on 12V as well? Thanks
    Yes, but you should change the 10 K pullup resistor with a 4.7 K one. (On both channels)

    Edited: I have posted a new schematic with the correct pullup value for 12 volts and correctly wired, since in my previous post, schematic shows resistor wrongly connected (see the two schematics and note the mistake)
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    Last edited by aratti; - 9th April 2010 at 19:04.
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