FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
June 2010
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 UniFET™s with Fast-Recovery Type Body
Diode (t
rr
<160ns).
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)
Description
The FSFR-series include 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.
Applications
PDP and LCD TVs
Desktop PCs and Servers
Adapters
Telecom Power Supplies
Audio Power Supplies
Related Resources
AN-4151 — Half-Bridge LLC Resonant Converter Design
™
Using FSFR-Series Fairchild Power Switch (FPS )
Ordering Information
Part
Number
FSFR2100U
FSFR2000
FSFR1900
FSFR1800
FSFR1700
FSFR1600
FSFR1800L
FSFR1700L
FSFR1600L
9-SIP(L-Forming)
9-SIP
-40 to +130°C
Package
Operating
Junction
Temperature
R
DS(ON_MAX)
0.51Ω
0.67Ω
0.85Ω
0.95Ω
1.25Ω
1.55Ω
0.95Ω
1.25Ω
1.55Ω
Maximum Output Power
without Heatsink
(1,2)
(V
IN
=350~400V)
180W
160W
140W
120W
100W
80W
120W
100W
80W
Maximum Output
Power with Heatsink
(1,2)
(V
IN
=350~400V)
400W
350W
300W
260W
200W
160W
260W
200W
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.
© 2007 Fairchild Semiconductor Corporation
FSFR series Rev.1.0.9
www.fairchildsemi.com
FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Application Circuit Diagram
Cr
L
lk
V
CC
RT
LVcc
V
DL
HV
CC
D1
Np
Ns
Vo
Lm
Ns
C
DL
V
IN
CON
Control
IC
D2
V
CTR
KA431
C
F
R
F
CS
SG
PG
R
sense
Figure 1. Typical Application Circuit (LLC Resonant Half-Bridge Converter)
Block Diagram
1.5
μ
s
Figure 2. Internal Block Diagram
© 2007 Fairchild Semiconductor Corporation
FSFR series Rev.1.0.9
www.fairchildsemi.com
2
FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Pin Configuration
1
V
DL
2 3 4 5 6 7
8
9
HVcc
R
T
SG LVcc
CON CS PG
10
V
CTR
Figure 3. Package Diagram
Pin Definitions
Pin #
1
2
Name
V
DL
CON
Description
This is the drain of the high-side MOSFET, typically connected to the input DC link voltage.
This pin is for enable/disable and protection. When the voltage of this pin is above 0.6V, the
IC operation is enabled. When the voltage of this pin drops below 0.4V, gate drive signals for
both MOSFETs are disabled. When the voltage of this pin increases above 5V, protection is
triggered.
This pin programs the switching frequency. Typically, an opto-coupler is connected to control
the switching frequency for the output voltage regulation.
This pin senses the current flowing through the low-side MOSFET. Typically, negative
voltage is applied on this pin.
This pin is the control ground.
This pin is the power ground. This pin is connected to the source of the low-side MOSFET.
This pin is the supply voltage of the control IC.
No connection.
This is the supply voltage of the high-side gate-drive circuit IC.
This is the drain of the low-side MOSFET. Typically, a transformer is connected to this pin.
3
4
5
6
7
8
9
10
R
T
CS
SG
PG
LV
CC
NC
HV
CC
V
CTR
© 2007 Fairchild Semiconductor Corporation
FSFR series Rev.1.0.9
www.fairchildsemi.com
3
FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In
addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. T
A
=25°C unless otherwise specified.
Symbol
V
DS
LV
CC
HV
CC
V
CON
V
CS
V
RT
dV
CTR
/dt
Low-Side Supply Voltage
Parameter
Maximum Drain-to-Source Voltage (V
DL
-V
CTR
and V
CTR
-PG)
Min.
500
-0.3
-0.3
-0.3
-0.3
-5.0
-0.3
FSFR2100U
FSFR2000
FSFR1900
FSFR1800
FSFR1700
FSFR1600
Max.
25.0
25.0
525.0
LV
CC
1.0
5.0
50
12.0
12.0
11.8
11.7
11.6
11.5
+150
Unit
V
V
V
V
V
V
V
V/ns
HV
CC
to V
CTR
High-Side V
CC
Pin to Low-Side Drain Voltage
High-Side Floating Supply Voltage
Control Pin Input Voltage
Current Sense (CS) Pin Input Voltage
R
T
Pin Input Voltage
Allowable Low-Side MOSFET Drain Voltage Slew Rate
P
D
Total Power Dissipation
(3)
W
T
J
T
STG
V
DGR
V
GS
Maximum Junction Temperature
Storage Temperature Range
Drain Gate Voltage (R
GS
=1MΩ)
Gate Source (GND) Voltage
(4)
(4)
Recommended Operating Junction Temperature
-40
-55
500
+130
+150
°C
°C
V
MOSFET Section
±30
FSFR2100U
FSFR2000
I
DM
Drain Current Pulsed
(5)
V
32
31
26
23
20
18
Continued on the following page…
A
FSFR1900
FSFR1800
FSFR1700
FSFR1600
© 2007 Fairchild Semiconductor Corporation
FSFR series Rev.1.0.9
www.fairchildsemi.com
4
FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Absolute Maximum Ratings
(Continued)
Symbol
MOSFET Section
(Continued)
FSFR2100U
FSFR2000
FSFR1900
I
D
Continuous Drain Current
FSFR1800
FSFR1700
FSFR1600
Package Section
Torque
Recommended Screw Torque
5~7
kgf·cm
Notes:
3. Per MOSFET when both MOSFETs are conducting.
4. The maximum value of the recommended operating junction temperature is limited by thermal shutdown.
5. Pulse width is limited by maximum junction temperature.
T
C
=25°C
T
C
=100°C
T
C
=25°C
T
C
=100°C
T
C
=25°C
T
C
=100°C
T
C
=25°C
T
C
=100°C
T
C
=25°C
T
C
=100°C
T
C
=25°C
T
C
=100°C
10.5
6.5
9.5
6.0
8.0
5.0
7.0
4.5
6.0
3.9
4.5
2.7
A
Parameter
Min.
Max.
Unit
Thermal Impedance
T
A
=25°C unless otherwise specified.
Symbol
Parameter
FSFR2100U
FSFR2000
Value
10.44
10.44
10.56
10.68
10.79
10.89
Unit
θ
JC
Junction-to-Case Center Thermal Impedance
(Both MOSFETs Conducting)
FSFR1900
FSFR1800
FSFR1700
FSFR1600
ºC/W
© 2007 Fairchild Semiconductor Corporation
FSFR series Rev.1.0.9
www.fairchildsemi.com
5
