May 2008

© 2007 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FSFR series • 1.0.3

for Half-Bridge Resonant Converters

Features

Variable Frequency Control with 50% Duty Cycle

for Half-bridge Resonant Converter Topology

High Efficiency through Zero Voltage Switching (ZVS)

Internal SuperFET™s with Fast-Recovery Type

FSFR2000/1900/1800/1700.

Fixed Dead Time (350ns) Optimized for MOSFETs

Up to 300kHz Operating Frequency

Pulse Skipping for Frequency Limit (Programmable)

at Light-Load Condition

Remote On/Off Control Using Control Pin

Protection Functions: Over-Voltage Protection

(OVP), Over-Load Protection (OLP), Over-Current

Protection (OCP), Abnormal Over-Current Protection

(AOCP), Internal Thermal Shutdown (TSD)

Applications

PDP and LCD TVs

Desktop PCs and servers

Adapters

Telecom Power Supplies

Audio Power Supplies

Description

The FSFR-series are a highly integrated power switches

designed

for

high-efficiency

half-bridge

resonant

converters. Offering everything necessary to build a

reliable and robust resonant converter, the FSFR-series

simplifies designs and improves productivity, while

improving performance. The FSFR-series combines

power MOSFETs with fast-recovery type body diodes, a

high-side

gate-drive

circuit,

an

accurate

current

controlled oscillator, frequency limit circuit, soft-start, and

built-in protection functions. The high-side gate-drive

circuit

has

a

common-mode

noise

cancellation

capability, which guarantees stable operation with

excellent noise immunity. The fast-recovery body diode

of the MOSFETs improves reliability against abnormal

operation conditions, while minimizing the effect of the

reverse recovery. Using the zero-voltage-switching (ZVS)

technique dramatically reduces the switching losses and

efficiency is significantly improved. The ZVS also

reduces the switching noise noticeably, which allows a

small-sized Electromagnetic Interference (EMI) filter.

The FSFR-series can be applied to various resonant

converter topologies such as series resonant, parallel

resonant, and LLC resonant converters.

Related Resources

AN4151 — Half-bridge LLC Resonant Converter Design

using FSFR-series Fairchild Power Switch (FPS

Ordering Information

Part

Number

Package

Operating

Junction

Temperature

Maximum Output Power

without Heatsink

(1,2)

Maximum Output

Power with Heatsink

(1,2)

FSFR2100

0.38

Ω

200W

450W

FSFR2000

0.67

Ω

160W

350W

FSFR1900

0.85

Ω

140W

300W

FSFR1800

0.95

Ω

120W

260W

FSFR1700

9-SIP

-40 to +130°C

1.25

Ω

100W

200W

Notes:

1.

The junction temperature can limit the maximum output power.

2.

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

°C ambient.

All standard Fairchild Semiconductor products are RoHS compliant and many are also “GREEN” or going green. For Fairchild’s