FP115

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Rev. 0.6

7/9

Operation Amplifier 1 and Operation Amplifier 2

FP115 includes two operation amplifiers. Their outputs are tied together to implement wired-NOR

function. When the inverting input voltage of OPA is lower than non-inverting reference voltage, the

output transistor is turn-off; otherwise the output transistor is turn-on. The output total sink current

ability is near 10mA

When apply FP115 in an AC-DC converter circuit, connect FP115’s output (pin1) to a

photo-coupler. The output will drive photo diode turning-on or off depending on the FB and CS pin

voltage to adjust AC-DC converter’s output voltage.

In general, OPA1 is used for voltage feedback and OPA2 is used for over current feedback.

Please check FP115 application note for detail design reference circuits.

Voltage feedback equation:

V

25

.

1

1

R

2

R

1













 



Current feedback equation:

Rs

Io

mV

156



