Pin Description

FC9910B

2013. 08. 29

4/10

Revision No : 1

Figure 3. Block Diagram of FC9910B

No Connects (NC) are not internally connected and may be used for pass-thru PCB traces.

Description

Name

SO-16

SO-8

DIP-8

1

1

Input voltage 8V to 450V DC

CS

4

2

Senses LED string current

GND

5

3

Device ground

GATE

8

4

Drives the gate of the external MOSFET

PWM_D

9

5

Low Frequency PWM Dimming pin, also Enable

input. Internal 100kΩ pull-down to GND

12

6

Internally regulated supply voltage. 7.5V

nominal. Can supply up to 1mA for external

circuitry. A sufficient storage capacitor is used to

provide storage when the rectified AC input is

near the zero crossings.

LD

13

7

Linear Dimming by changing the current limit

threshold at current sense comparator

14

8

Oscillator control. A resistor connected between

this pin and ground sets the PWM frequency.