© 2011 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN302UL • Rev. 1.0.3

3

Marking Information

Figure 4.Top Mark

Pin Configuration

Figure 5. Pin Assignments

Pin Definitions

Pin #

Name

Description

1

CS

Current Sense

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

Peak-Current-Mode control for output regulation. The current-sense information is also used to

estimate the output current for CC regulation.

2

GATE

PWM Signal Output

. This pin has an internal totem-pole output driver to drive the power

MOSFET. It is internally clamped at 15V.

3

VDD

Power Supply

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

4

VS

Voltage Sense

. This pin detects the output voltage information and diode current discharge

time based on voltage of the auxiliary winding.

5

GND

Ground

6

FB

Feedback

. Typically, an Opto-Coupler is connected to this pin to provide feedback information

to the internal PWM comparator. This feedback is used to control the duty cycle in CV

regulation.

7

NC

No Connect

8

HV

High Voltage

. This pin connects to the DC bus for high-voltage startup.

F

- Fairchild Logo

Z: Assembly Plant Code

X: Year Code

Y: Week Code

TT: Die Run Code

T: M=SOP

P: Y= Green Package

M: Manufacture Flow Code