Pin Functions - Samsung LW32A23W Service Manual

Block Diagrams
Backup Power Source
Viper 12A Block Diagram

Pin Functions

Name
For supplying power to the control circuit,dividing the charged current of the high-voltage current source connected to the drain
during startup,and comparing VDD voltage hysteresis.
VDD
Divided into two threshold voltages VDDon to start switching and to disconnect the startup current source (normally 14.5V), and
VDDoff to stop switching and to operate the startup current source (normally 8V)
Power MOSFET source and the circuit reference ground (GND)
SOURCE
Power MOSFET drain.Also used during startup as the internal high-voltage current source
DRAIN
until the external VDD capacitor is charged.
Feedback input.Operating voltage range of 0V ~1V.Determined by the maximum MOSFET current value.
FB
The current limit in due consideration of the maximum drain current is included in the FB pin that is connected to the source pin.
function
LW32A23W/LW40A23W