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LMR36006: powering a Buck-Converter from a bike hub-dynamo

Fritz Kendeffy-Hermann
Prodigy 10 points
Part Number: LMR36006

Hello,

is it possible to power a buck-converter (design) directly from a 6V bike hub-dynamo instead of 5-36V DC? The existing design and device represents a bike tracker with internet-connectivity, initially designed for e-bikes.The reverse protection p-mosfet would act like a simple diode-rectifier.

Question: would it be necessary to mount supplimentary capacitance at the input of the buck-converter for ripple-reduction? At higher bike-speeds, the frequency of AC-supply (dynamo) increases and would make things easier...

The AC-current from hub-dynamo offers voltage supply with frequencies from 11Hz (speed 6km/h up to 90Hz (speed 47km/h). Peak-voltage 6V to 40V referred to same speed interval.

Thank's

Fritz

  • 0
    TI__Mastermind 29590 points

    Hello Fritz, Not particularly familiar familiar with this particular application. Our devices are utilized in AC rectified applications. The device can tolerate (and reject) some input ripple. Too much input ripple could cause some output ripple which your downstream LDO might "Take care of." Would be best to verify in your evaluation.

    It might be a good idea to put a bulk, damping electrolytic on the input of the buck, looking on your schematic. Ie: 22uF.