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Voltage doubler issue.

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H

hemnath

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I have a test instrument which produces the output voltage of +4.8V. I want to increase this voltage to +5.8V and I cannot use boost converter because when the 4.8V starts to decrease, the voltage +5.8V should also starts to decrease. I have doubled the voltage using LMC7660 voltage converter and reduces the voltage using voltage divider network. Attached is the circuit for the reference.

But the problem is, when I test the circuit with a voltage source of +4.8V, it works good. But when I connect it to the test instrument it is not working. Please help to solve this issue.
 

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What's the source output impedance? I guess, you rather want a DC voltage amplifier (OP) with an auxiliary supply.
 

Do you want the 5.8V to decrease at the same absolute rate as the 4.8V, i.e. if the 4.8V drops to 4.5V you want the 5.8V to drop to 5.5V also?
 

Also note that the 7660 typically oscillates at 10KHz at which the 1N4007 is losing efficiency. As the current is very low it would work better with small signal diodes (1N914 etc) or better still a small Schottky type such as the BAT85.

Brian.
 

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