LM3411 Precision Secondary
Regulator/Driver
December 1999
LM3411 Precision Secondary
Regulator/Driver
General Description
The LM3411 is a low power fixed-voltage (3.
3V or 5.
0V) precision shunt
regulator designed specifically for driving an optoisolator to provide feedback isolation in a switching
regulator.
The LM3411 circuitry includes an internally compensated op amp, a bandgap reference,
NPN output
transistor, and voltage setting resistors.
A trimmed precision bandgap reference with temperature drift curvature correction, provides a guaranteed 1% precision over the operating temperature range (A grade version).
The amplifier’s inverting input is externally accessible for loop frequency ...