© 2012 Fairchild Semiconductor Corporation
4
FEBFL7701_L31H008A • Rev.1.0.2
Figure 1.
Block Diagram
Table 1.
Pin Definitions
Pin No.
Symbol
Description
1 CS
Current Sense
. Limits output current, depending on the sensing resistor voltage.
The CS pin is also used to set the LED current regulation.
2 OUT
OUT.
Connects to the MOSFET gate.
3 VCC
VCC
. Supply pin for stable IC operation, ZCD signal detection, and used for
accurate PFC function.
4 RT
RT
. Programmable operating frequency using an external resistor. The IC has a
fixed frequency when this pin is open or floating.
5 ADIM
Analog Dimming
. Connects to the internal current source and can change the
output current using an external resistor. If ADIM is not used, connect a 0.1 µF
bypass capacitor between ADIM and GND.
6 GND
GROUND
. Ground for the IC.
7 NC
No
Connection.
8 HV
High Voltage
. Connects to the high-voltage line and supplies current to the IC.
