FSFR-Series Fairchild Power Switch (FPS) for Half-Bridge Resonant Converter
June 2010
FSFR-Series Fairchild Power Switch (FPS)
for Half-Bridge Resonant Converters
Description
Features
The FSFR-series include highly integrated power
Variable Frequency Control with 50% Duty Cycle
switches designed for high-efficiency half-bridge
for Half-bridge Resonant Converter Topology
resonant converters. Offering everything necessary to
High Efficiency through Zero Voltage Switching (ZVS) build a reliable and robust resonant converter, the FSFR-
series simplifies designs and improves productivity, while
Internal UniFETs with Fast-Recovery Type Body
improving performance. The FSFR-series combines
Diode (t <160ns).
rr
power MOSFETs with fast-recovery type body diodes, a
Fixed Dead Time (350ns) Optimized for MOSFETs high-side gate-drive circuit, an accurate current
controlled oscillator, frequency limit circuit, soft-start, and
Up to 300kHz Operating Frequency
built-in protection functions. The high-side gate-drive
Pulse Skipping for Frequency Limit (Programmable)
circuit has a common-mode noise cancellation capability,
at Light-Load Condition
which guarantees stable operation with excellent noise
immunity. The fast-recovery body diode of the MOSFETs
Remote On/Off Control Using Control Pin
improves reliability against abnormal operation
Protection Functions: Over-Voltage Protection
conditions, while minimizing the effect of the reverse
(OVP), Over-Load Protection (OLP), Over-Current recovery. Using the zero-voltage-switching (ZVS)
technique dramatically reduces the switching losses and
Protection (OCP), Abnormal Over-Current Protection
efficiency is significantly improved. The ZVS also
(AOCP), Internal Thermal Shutdown (TSD)
reduces the switching noise noticeably, which allows a
small-sized Electromagnetic Interference (EMI) filter.
Applications
The FSFR-series can be applied to various resonant
PDP and LCD TVs
converter topologies, such as: series resonant, parallel
Desktop PCs and Servers
resonant, and LLC resonant converters.
Adapters
Related Resources
Telecom Power Supplies
AN-4151 Half-Bridge LLC Resonant Converter Design
Audio Power Supplies
Using FSFR-Series Fairchild Power Switch (FPS )
Ordering Information
Operating Maximum Output Power Maximum Output
Part
Package Junction R without Heatsink Power with Heatsink
DS(ON_MAX)
Number (1,2) (1,2)
Temperature (V =350~400V) (V =350~400V)
IN IN
FSFR2100U 180W 400W
0.51
FSFR2000 0.67 160W 350W
FSFR1900 0.85 140W 300W
9-SIP
FSFR1800 120W 260W
0.95
FSFR1700 -40 to +130C 100W 200W
1.25
FSFR1600 1.55 80W 160W
FSFR1800L 0.95 120W 260W
FSFR1700L 9-SIP(L-Forming) 100W 200W
1.25
FSFR1600L 1.55 80W 160W
Notes:
1. The junction temperature can limit the maximum output power.
2. Maximum practical continuous power in an open-frame design at 50C ambient.
2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSFR series Rev.1.0.9 FSFR-Series Fairchild Power Switch (FPS) for Half-Bridge Resonant Converter
Application Circuit Diagram
D1
Cr
L
lk
Np Vo
Ns
LVcc V
DL
V
CC
Lm
HV
CC
Ns
RT
C R
F F
Control D2
CON
C
DL
IC
V
CTR
V
IN
KA431
CS
SG PG
R
sense
Figure 1. Typical Application Circuit (LLC Resonant Half-Bridge Converter)
Block Diagram
1.5s
Figure 2. Internal Block Diagram
2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSFR series Rev.1.0.9 2