My designed charge pump performs well during no load condition.
But when I put the load, the output voltage don't increase sometimes it's lower as compared with the input voltage.
What happened? What should I do?
here is the circuit I used..
I got this from a paper.
How should I reinforce my charge pump?
---------- Post added at 13:24 ---------- Previous post was at 13:21 ----------
that pump should have an output of 80mA..The value of C1 and C2 I used were 1p and for the C3 and C4 were 100p.
I also tried to increased C3 and C4 to 1u but still it's no good.....
---------- Post added at 13:58 ---------- Previous post was at 13:24 ----------
... that pump should have an output of 80mA..The value of C1 and C2 I used were 1p and for the C3 and C4 were 100p.
I also tried to increased C3 and C4 to 1u but still it's no good.....my operating frequency is 1MHz...
80mA/1MHz = 80nC per cycle.
You have to compute if your charge pump can transfer greater than this charge every cycle.
You can also determine the maximum your charge pump can support by sweeping your load.
If you need to increase the load, you generally need either larger capacitances and/or higher frequency.
Also, you have to take into account other losses such as parasitic capacitances and cross-conduction currents.
80mA/1MHz = 80nC per cycle.
You have to compute if your charge pump can transfer greater than this charge every cycle.
You can also determine the maximum your charge pump can support by sweeping your load.
If you need to increase the load, you generally need either larger capacitances and/or higher frequency.
Also, you have to take into account other losses such as parasitic capacitances and cross-conduction currents.