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Topics - GregMill

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General Mach Discussion / Clarification of charge pump frequency
« on: August 01, 2007, 02:36:31 PM »
I have been having problems with my charge pump circuit working correctly and I have narrowed it down to most likely be a charge pump hardware issue on my breakout board. While debugging the problem I measured the charge pump frequency to be ~6.4kHz with a period of 156us using an Oscilloscope. This appears to be half the listed frequency of 12.5kHz given in the documentation. This was very confusing to me and I thought I had a serious driver problem. I measured the same frequency on 2 other PCs and the driver test runs at a very smooth ~25kHz rate. So the conclusion I have drawn is that the 12.5kHz listed rate is not the pulse frequency (measured rising edge to rising edge with 50% duty cycle) but rather the update rate of the pulse generator (rising edge to falling edge to rising edge…) resulting in the pulse frequency being half the update rate frequency. Is my assumption correct or am I making a newbie error in blindness or misunderstanding.

Thanks for you clarification,
Greg

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