April 2009
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSFR series • Rev.1.0.5
FSFR-Series — Fairchild Power Switch (FPS
™
) for Half-Bridge Resonant Converter
FSFR-Series — Fairchild Power Switch (FPS™)
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
Body Diode (t
rr
=120ns) for FSFR2100 and UniFETs
with Fast-Recovery Type Body Diode (t
rr
<160ns) for
FSFR2100U/2000/1900/1800/1700.
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
TM
)
Ordering Information
Part
Number
Package
Eco
Status
Operating
Junction
Temperature
R
DS(ON_MAX)
Maximum Output Power
without Heatsink
(V
IN
=350~400V)
(1,2)
Maximum Output Power
with Heatsink
(V
IN
=350~400V)
(1,2)
FSFR2100
0.38:
200W 450W
FSFR2100U
0.51:
180W 400W
FSFR2000
0.67:
160W 350W
FSFR1900
0.85:
140W 300W
FSFR1800
0.95:
120W 260W
FSFR1700
9-SIP
RoHS
-40 to +130°C
1.25:
100W 200W
Notes:
1. The junction temperature can limit the maximum output power.
2. Maximum practical continuous power in an open-frame design at 50qC ambient.
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
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