I need to control an LED driver with analog 0(1)-10V control input.
This control device should be very cheap and compact so until now I made a schematic which uses the fact that those drivers have 100 uA current source at its dimming input. Switching capacitor made this cheap, small and relatively easy.
But now I need to adapt this solution for a driver which has "400...550 uA current at control pin". This is a problem for several reasons:
- I need to drive about 5...10-times more current in the primary circuit which becomes 4-5 mA (I don't have so much current)
- Switching capacitance schematic gives a voltage depending on a current. So if this current isn't precise - my voltage will be not precise as well
I'd like to avoid any isolated DC-DC with opamps solutions as this will be big and expensive.
Is there any better solutions?