January 2009

© 2009 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FSQ510, FSQ510H, and FSQ510M • Rev. 1.3.0

FSQ510, FSQ510H, and FSQ510M

Green Mode Fairchild Power Switch (FPS™)

for Valley Switching Converter – Low EMI and High Efficiency

Features

Uses an LDMOS Integrated Power Switch

Optimized for Valley Switching Converter (VSC)

Low EMI through Variable Frequency Control and

Inherent Frequency Modulation

High Efficiency through Minimum Drain Voltage

Switching

Extended Valley Switching for Wide Load Ranges

Small Frequency Variation for Wide Load Ranges

Advanced Burst-Mode Operation for Low Standby

Power Consumption

Pulse-by-Pulse Current Limit

Protection Functions: Overload Protection (OLP),

Internal Thermal Shutdown (TSD) with Hysteresis

Under-Voltage Lockout (UVLO) with Hysteresis

Internal Startup Circuit

Internal High-Voltage SenseFET: 700V

Built-in Soft-Start: 5ms

Applications

Auxiliary Power Supplies for LCD TV, LCD Monitor,

Personal Computer, and White Goods

Description

A Valley Switching Converter (VSC) generally shows

lower EMI and higher power conversion efficiency than

a conventional hard-switched converter with a fixed

switching frequency. The FSQ510 (H or M) is an

integrated valley switching pulse width modulation (VS-

PWM) controller and SenseFET specifically designed

for offline switch-mode power supplies (SMPS) for

valley switching with minimal external components. The

VS-PWM controller includes an integrated oscillator,

under-voltage lockout (UVLO), leading-edge blanking

(LEB),

optimized

gate

driver,

internal

soft-start,

temperature-compensated precise current sources for

loop compensation, and self-protection circuitry.

Compared with discrete MOSFET and PWM controller

solutions, the FSQ510 (H or M) can reduce total cost,

component count, size and weight; while simultaneously

increasing efficiency, productivity, and system reliability.

This device provides a platform for cost-effective designs

of a valley switching flyback converters.

Ordering Information

Output Power Table

(1)

(2)

Part

Number

Package

Eco

Status

Operating

Junction

Temperature

Current

Limit

(MAX)

Adapter

(3)

Open

Frame

(3)

Open

Frame

(4)

Replaces

Devices

FSQ510

7-DIP

FSD210B

FSQ510H

8-DIP

FSD210DH

FSQ510M 7-MLSOP

RoHS -40 to +130

°C 320mA

32

Ω

5.5W

9W

4W

6W

FSD210BM

Notes:

1.

The junction temperature can limit the maximum output power.

2.

3.

Typical continuous power with a Fairchild charger evaluation board described in this datasheet in a non-

ventilated, enclosed adapter housing, measured at 50

°C ambient temperature.

4.

Maximum practical continuous power for auxiliary power supplies in an open-frame design at 50

°C ambient temperature.