August 2011

© 2011 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FSFR1800 / FSFR1700-HS • Rev.1.0.0

(FPS™) for Half-Bridge Resonant Converters

Features

for Half-Bridge Resonant Converter Topology

Line UVLO without External Components

Over-Current Protection (OCP), Abnormal Over-

Current Protection (AOCP), Internal Thermal

Shutdown (TSD)

Applications

Description

The FSFR-HS is a highly integrated power switch

designed

for

high-efficiency

half-bridge

resonant

converters. Offering everything necessary to build a

reliable and robust resonant converter, the FSFR-HS

simplifies designs while improving productivity and

performance. The FSFR-HS combines power MOSFETs,

a high-side gate-drive circuit, an accurate current-

controlled oscillator, and built-in protection functions.

The high-side gate-drive circuit has a common-mode

noise cancellation capability, which provides stable

operation with excellent noise immunity. Using zero-

voltage-switching (ZVS) technique dramatically reduces

the switching losses and significantly improves efficiency.

The ZVS also reduces the switching noise noticeably,

even though the operating frequency increases. It allows

a small Electromagnetic Interference (EMI) filter, besides

the high operating frequency, to reduce the volume of the

resonant tank and to increase power density.

The FSFR-HS can be applied to 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)

FSFR1800HS

9-SIP

-40 to +130°C

0.95Ω

120W

260W

FSFR1800HSL

9-SIP

L-Forming

FSFR1700HS

9-SIP

-40 to +130°C

1.25Ω

100W

200W

FSFR1700HSL

9-SIP

L-Forming

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.