© 2008 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN400A Rev. 1.0.2

3

Marking Information

Figure 3.

Top Mark

Pin Configuration

Figure 4.

Pin Configurations

Pin Definitions

DIP

Pin #

SSOT

Pin #

Name

Description

1

6

GATE

The totem-pole output driver to drive the power MOSFET

2

5

VDD

Power supply

3

NC

No connection

4

4

SENSE

Current sense senses the voltage across a sensed resistor. To provide over-

current protection, PWM output is disabled if the voltage exceeds an internal

threshold. This pin also provides current information for current-mode control.

5

NC

No connection

6

3

NC

No connection

7

2

FB

The FB pin provides feedback information to the internal PWM comparator. This

feedback is used to control the duty cycle. When no feedback is provided, this

pin is left open.

8

1

GND

Ground

SSOT-6

GND

FB

NC

GATE

VDD

SENSE

DIP-8

NC

NC

FB

GND

SENSE

NC

VDD

GATE

XXX: AAT=FAN400A

TT : Die run code

---: Week code

1’st line

Z: Assembly plant code

X: Year code

Y: Week code

TT: Die run code

3’rd line

T: N=DIP

P: Y=Green package

M: Manufacture flow code