Datasheet

1.3. Internal Block Diagram

Figure 1. Internal Block Diagram

Pin Descriptions

Pin 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

Output. Connects to the MOSFET gate.

3 VCC

Supply Voltage. Supply pin for stable IC operation; ZCD signal detection used

for accurate PFC function.

4 RT

Resistor. Programmable operating frequency using an external resistor

connected to this PIN and the IC has fixed frequency when this pin is left 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 0.1µF

bypass capacitor between ADIM and GND.

6 GND

GROUND. Ground for the IC.

7 NC No Connection

8 HV

High Voltage. Connect to the high-voltage line and supply current to the IC