I understand that most LED lighting inverters which allow for a 0-10VDC signal input to control the brightness require a voltage signal that can "sink" as opposed to a sourcing 0-10VDC output that most building controls provide.
I need to covert a 0-10VDC sourcing output to a 0-10VDC sinking output in order to control these lights.
I have not seen anyone put together a circuit to do this conversion. At a glance it seems rather simple however in practice I keep having a lot off issues implementing a working circuit. The Dimming input seems to sink about 0.1mA of current however as the voltage changes so does the current required.
The basic circuit I have put together involves an opamp to a PNP Transistor a separate 12VDC power supply is powering the opamp.
I beleive that the PNP may be getting damaged in some cases if a light is not connected.
I perfer not to do PWM.
Appreciate the help.
I need to covert a 0-10VDC sourcing output to a 0-10VDC sinking output in order to control these lights.
I have not seen anyone put together a circuit to do this conversion. At a glance it seems rather simple however in practice I keep having a lot off issues implementing a working circuit. The Dimming input seems to sink about 0.1mA of current however as the voltage changes so does the current required.
The basic circuit I have put together involves an opamp to a PNP Transistor a separate 12VDC power supply is powering the opamp.
I beleive that the PNP may be getting damaged in some cases if a light is not connected.
I perfer not to do PWM.
Appreciate the help.
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