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FSL137MRIN

Green-Mode Fairchild Power Switch (FPS™)

Fairchild Semiconductor 

Pin Configuration

1. GND

2. VCC

3. FB

4. VIN

FSL137MRIN

8. Drain

7. Drain

6. Drain

5. VSTR

Figure 3. Pin Assignments (Top View)

Pin Definitions

Pin #

1

2

3

4

5

6

7

8

Name

GND

VCC

FB

VIN

VSTR

Description

Ground. This pin is the control ground and the SenseFET source.

Power Supply. This pin is the positive supply input, which provides the internal operating

current for both startup and steady-state operation.

Feedback. This pin is internally connected to the inverting input of the PWM comparator.

The collector of an opto-coupler is typically tied to this pin. For stable operation, a capacitor

should be placed between this pin and GND. If the voltage of this pin reaches 7 V, the

overload protection triggers, which shuts down the FPS.

Line Over-Voltage Input. This is the input pin of line voltage. The voltage, which is divided by

resistors, is the input of this pin. If this pin voltage is higher than VINH voltage, the LOVP

triggers, which shuts down the FPS. Do not leave this pin floating. If LOVP is not used, this

pin should be directly connected to GND.

Startup. This pin is connected directly, or through a resistor, to the high-voltage DC link.

At startup, the internal high-voltage current source supplies internal bias and charges the

external capacitor connected to the VCC pin. Once VCC reaches 12 V, the internal current

source (ICH) is disabled.

Drain SenseFET Drain. High-voltage power SenseFET drain connection.

© 2012 Fairchild Semiconductor Corporation

FSL137MRIN • Rev. 1.0.1

3

www.fairchildsemi.com

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