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If you have a cigar lighter to USB power converter used in your automobile to charge from a USB bus that fits in your car cigar lighter, the USB voltage is 5V. The car is 12V.

So there is a switch to turn it on for 5 ticks and off for 7 ticks

42% duty cycle

if you wanted 1.2V 10% duty cycle

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Q: What is the relationship between output voltage and duty cycle in a step down chopper?
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