December 2010

© 2010 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FLS-XS Series • Rev.1.0.0

FLS-XS Series — Half-Bridge LLC Resonant

Features

Variable Frequency Control with 50% Duty Cycle

for Half-Bridge Resonant Converter Topology

High Efficiency through Zero Voltage Switching (ZVS)

Internal UniFET™ with Fast-Recovery Body Diode

Fixed Dead Time (350ns) Optimized for MOSFETs

Up to 300kHz Operating Frequency

Auto-Restart Operation for All Protections with

Protection Functions: Over-Voltage Protection (OVP),

Over-Current Protection (OCP), Abnormal Over-

Current Protection (AOCP), Internal Thermal

Shutdown (TSD)

Applications

General LED Lighting Power

Industrial, Commercial, and Residential LED

Lighting Fixtures

Outdoor Lighting: Street, Roadway, Parking,

Construction and Ornamental LED Lighting Fixtures

Description

The FLS-XS series of general lighting power controllers

includes highly integrated power switches for medium- to

high-power lumens applications. Offering everything

necessary to build a reliable and robust half-bridge

resonant converter, the FLS-XS series simplifies designs

and improves productivity, while improving performance.

The FLS-XS 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 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 reverse recovery. Using zero voltage

switching (ZVS) dramatically reduces the switching

losses and significantly improves efficiency. ZVS also

reduces switching noise noticeably, which allows a small-

sized Electromagnetic Interference (EMI) filter.

The FLS-XS series can be applied to resonant converter

topologies such as series resonant, parallel resonant,

and LLC resonant converters.

Ordering Information

Part Number

Package

Operating

Junction

Temperature

Maximum Output Power

without Heatsink

(1,2)

Maximum Output

Power with Heatsink

(1,2)

FLS2100XS

9-SIP

-40 to +130°C

0.51

Ω

180W

400W

FLS1800XS

0.95

Ω

120W

260W

FLS1700XS

1.25

Ω

100W

200W

FLS1600XS

1.55

Ω

80W

160W

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.