FAN7602B Просмотр технического описания (PDF) - Fairchild Semiconductor

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FAN7602B

Green Current Mode PWM Controller

Fairchild Semiconductor 

Pin Assignments

VSTR

NC

VCC

Out

8

7

6

5

FAN7602B

YWW

1

LUVP

2

Latch/

Plimit

3

CS/FB

4

GND

Figure 3. Pin Configuration (Top View)

Pin Definitions

Pin #

1

2

3

4

5

6

7

8

Name

Description

LUVP

Line Under-Voltage Protection Pin. This pin is used to protect the set when the

input voltage is lower than the rated input voltage range.

Latch Protection and Power Limit Pin. When the pin voltage exceeds 4V, the latch

Latch/Plimit protection works; the latch protection is reset when the VCC voltage is lower than 5V.

For the power limit function, the OCP level decreases as the pin voltage increases.

CS/FB

Current Sense and Feedback Pin. This pin is used to sense the MOSFET current

for the current mode PWM and OCP. The output voltage feedback information and

the current sense information are added using an external RC filter.

GND

Ground Pin. This pin is used for the ground potential of all the pins. For proper oper-

ation, the signal ground and the power ground should be separated.

OUT

Gate Drive Output Pin. This pin is an output pin to drive an external MOSFET. The

peak sourcing current is 450mA and the peak sinking current is 600mA. For proper

operation, the stray inductance in the gate driving path must be minimized.

VCC

Supply Voltage Pin. IC operating current and MOSFET driving current are supplied

using this pin.

NC

No Connection.

VSTR

Start-up Pin. This pin is used to supply IC operating current during IC start-up. After

start-up, the internal JFET is turned off to reduce power loss.

© 2007 Fairchild Semiconductor Corporation

FAN7602B Rev. 1.0.0

3

www.fairchildsemi.com

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