On-chip Low power PWM or PFM

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Mohammad Ibrahim

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Need a low power PWM or PFM MOSFET circuit for controlling transitor in boost converter.
Or do you have Any idea to generate a square clock from sine wave?
 

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Hi,

No electrical specifications?
Frequency range voltage levels, duty cycle range...

Especially when you require "low power" ... then you need to give a useful value for this.
Noboby can guess what "low power" means for you..
"As low as possible" is no valid specification.

Klaus
 
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Choice of PFM vs PWM must consider the other content / function of the chip or board. RF in particular does not like PFM for its variable fundamental frequency (and harmonics). Although PFM in a well tuned resonant scheme can exude less RF energy to begin with, you can't define a frequency plan around "whatever".
 

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2-transistor boost converter (modified from version seen on internet).
PNP & NPN arranged as a sziklai pair, producing 'snap action' which is necessary to switch coil On and Off.
Boosts 1V to flash a 3.6V bright white led.


 

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