EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: gaminn on November 04, 2019, 03:39:19 pm
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Hi,
I made this inverting charge pump: https://www.allaboutcircuits.com/uploads/articles/DPNVG.jpg (https://www.allaboutcircuits.com/uploads/articles/DPNVG.jpg) . I used BAT65S diode and 2 100nF capacitors. The power supply is 3V3 and I use microcontroller to create PWM (1 kHz, 50 % duty) which drives the circuit.
The circuit itself works (there is -3V output). However, the circuit I have has almost 0 % efficiency, it consumes 13 mA when it is operating. There is nothing connected to the output of the circuit.
I need something that has quiescent current max 0.1 mA. Is this achievable with this circuit?
EDIT: I made some stupid mistake on board, the inverter has perfect efficiency. This topic can be deleted.