Data Sheet

© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSFR-XS Series • Rev.1.0.2 3
FSFR-XS Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Pin Configuration
Figure 3. Package Diagram
Pin Definitions
Pin # Name Description
1 V
DL
This is the drain of the high-side MOSFET, typically connected to the input DC link voltage.
2 AR
This pin is for discharging the external soft-start capacitor when any protections are
triggered. When the voltage of this pin drops to 0.2 V, all protections are reset and the
controller starts to operate again.
3 R
T
This pin programs the switching frequency. Typically, an opto-coupler is connected to control
the switching frequency for the output voltage regulation.
4 CS
This pin senses the current flowing through the low-side MOSFET. Typically, negative
voltage is applied on this pin.
5 SG This pin is the control ground.
6 PG This pin is the power ground. This pin is connected to the source of the low-side MOSFET.
7 LV
CC
This pin is the supply voltage of the control IC.
8 NC No connection.
9 HV
CC
This is the supply voltage of the high-side gate-drive circuit IC.
10 V
CTR
This is the drain of the low-side MOSFET. Typically, a transformer is connected to this pin.