Hello everyone.
So I am trying to implement an op amp based, constant current source, which needs to sink OR source around 0-100mA (Max), for a varying R_LOAD of about little to 2kO(Max).
Attached is the basic circuit I have so far. In the simulation, the current is maintained constant the way I need it to, following the relation I= Vin/Rsense = 1V/10O= 100mA.
The current can be maintained as long as my "Vcc" source is greater than the voltage at the R_LOAD. I've found a miniature, "unregulated DC-DC converter" which provides 200Vout, @ 6.25mA,and it is powered by 0-5V DC. Its all great except that the DC converter does not source the current that I need, so I need to find a way to increase the current it can source to about 100mA (maybe a little more I guess?)while also delivering the original 200 V to the load. The original idea was to power the circuit with batteries, since the control signal Vin was coming from a microcontroller. Im trying to make this as "portable" as possible, however this is NOT an absolute requirement. To sum up, what kind of arrangement would I need to add in order to increase the DC Converter source current capability?
Thank you guys, I'd appreciate any information!
So I am trying to implement an op amp based, constant current source, which needs to sink OR source around 0-100mA (Max), for a varying R_LOAD of about little to 2kO(Max).
Attached is the basic circuit I have so far. In the simulation, the current is maintained constant the way I need it to, following the relation I= Vin/Rsense = 1V/10O= 100mA.
The current can be maintained as long as my "Vcc" source is greater than the voltage at the R_LOAD. I've found a miniature, "unregulated DC-DC converter" which provides 200Vout, @ 6.25mA,and it is powered by 0-5V DC. Its all great except that the DC converter does not source the current that I need, so I need to find a way to increase the current it can source to about 100mA (maybe a little more I guess?)while also delivering the original 200 V to the load. The original idea was to power the circuit with batteries, since the control signal Vin was coming from a microcontroller. Im trying to make this as "portable" as possible, however this is NOT an absolute requirement. To sum up, what kind of arrangement would I need to add in order to increase the DC Converter source current capability?
Thank you guys, I'd appreciate any information!
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