© 2012 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FLS3217 / FLS3247 • Rev. 1.0.0

3

Marking Information

ZXYTT

TM

S3217

ZXYTT

TM

S3247

Figure 3.

Top Mark

Pin Configuration

Figure 4.

Pin Configuration

Pin Definitions

Pin #

Name

Description

1

CS

Current Sense

. This pin connects a current-sense resistor to detect the MOSFET current for

the output-current regulation in Constant-Current (CC) regulation.

2

VDD

Power Supply

. IC operating current and MOSFET driving current are supplied using this pin.

3

GND

Ground

4

VS

Voltage Sense

. This pin detects the output voltage information and discharge time for

maximum frequency control and constant current regulation. This pin is connected to an

auxiliary winding of the transformer via resistors of the divider.

5

COMI

Constant Current Loop Compensation

. This pin is connected to a capacitor between the

COMI and GND pins for compensation current loop gain.

6

NC

No Connect

7

DRAIN

Power MOSFET Drain.

This pin is the high-voltage power MOSFET drain.

F

: Fairchild Logo

Z: Plant Code

X: 1-Digit Year Code

Y: 1-Digit Week Code

TT: 2-Digit Die Run Code

T: Package Type (M=SOIC, N=DIP)

M: Manufacture Flow Code