T
treez
Guest
Hello,
The following PDF (& LTspice .txt simulation) schematic is a buckboost LED driver with Vin = 100V.
Please can you confirm that the bias supply for the high side optocoupler feedback, MUST be from a constant current source as shown (LT3092 is a constant current source IC).
If it is not a constant current bias supply , then the varying draw of current by the optocoupler feedback circuit interferes with the feedback loop.
Do you agree with this, (that the current source high side bias supply must indeed be a current source)?
Spec:
Buckboost
Vin = 12-100V
Vout = 40 to 64V
Switching frequency = 200KHz
LED current = 100mA
Discontinuous Mode.
The following PDF (& LTspice .txt simulation) schematic is a buckboost LED driver with Vin = 100V.
Please can you confirm that the bias supply for the high side optocoupler feedback, MUST be from a constant current source as shown (LT3092 is a constant current source IC).
If it is not a constant current bias supply , then the varying draw of current by the optocoupler feedback circuit interferes with the feedback loop.
Do you agree with this, (that the current source high side bias supply must indeed be a current source)?
Spec:
Buckboost
Vin = 12-100V
Vout = 40 to 64V
Switching frequency = 200KHz
LED current = 100mA
Discontinuous Mode.
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