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PDF FSFR Data sheet ( Hoja de datos )

Número de pieza FSFR
Descripción Power Switch
Fabricantes Fairchild Semiconductor 
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May 2008
FSFR-Series — Fairchild Power Switch (FPS™)
for Half-Bridge Resonant Converters
Features
ƒ Variable Frequency Control with 50% Duty Cycle
for Half-bridge Resonant Converter Topology
ƒ High Efficiency through Zero Voltage Switching (ZVS)
ƒ Internal SuperFET™s with Fast-Recovery Type
Body Diode (trr=120ns) for FSFR2100 and UniFETs
with Fast-Recovery Type Body Diode (trr<160ns) for
FSFR2000/1900/1800/1700.
ƒ Fixed Dead Time (350ns) Optimized for MOSFETs
ƒ Up to 300kHz Operating Frequency
ƒ Pulse Skipping for Frequency Limit (Programmable)
at Light-Load Condition
ƒ Remote On/Off Control Using Control Pin
ƒ Protection Functions: Over-Voltage Protection
(OVP), Over-Load Protection (OLP), Over-Current
Protection (OCP), Abnormal Over-Current Protection
(AOCP), Internal Thermal Shutdown (TSD)
Applications
ƒ PDP and LCD TVs
ƒ Desktop PCs and servers
ƒ Adapters
www.DataSƒheetT4Uel.ecocmom Power Supplies
ƒ 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 (FPSTM)
Ordering Information
Part
Number
FSFR2100
Package
Operating
Junction
Temperature
Maximum Output Power Maximum Output
RDS(ON_MAX)
without Heatsink
(VIN=350~400V) (1,2)
Power with Heatsink
(VIN=350~400V)(1,2)
0.38Ω
200W
450W
FSFR2000
0.67Ω
160W
350W
FSFR1900 9-SIP
-40 to +130°C
0.85Ω
140W
300W
FSFR1800
0.95Ω
120W
260W
FSFR1700
1.25Ω
100W
200W
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.
All standard Fairchild Semiconductor products are RoHS compliant and many are also “GREEN” or going green. For Fairchild’s
definition of “green” please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2007 Fairchild Semiconductor Corporation
FSFR series • 1.0.3
www.fairchildsemi.com

1 page




FSFR pdf
Absolute Maximum Ratings (Continued)
Symbol
Parameter
Min.
Max.
Unit
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.
Thermal Impedance
TA=25°C unless otherwise specified.
Symbol
Parameter
θJC
Junction-to-Case Center Thermal Impedance
(Both MOSFETs Conducting)
FSFR2100
FSFR2000
FSFR1900
FSFR1800
FSFR1700
Value
10.44
10.44
10.56
10.68
10.79
Unit
ºC/W
www.DataSheet4U.com
© 2007 Fairchild Semiconductor Corporation
FSFR series • 1.0.3
5
www.fairchildsemi.com

5 Page





FSFR arduino
connecting R-C series network on the RT pin, as shown
in Figure 19. FSFR-series also has an internal soft-start
for 3ms to reduce the current overshoot during the initial
cycles, which adds 40kHz to the initial frequency of the
external soft-start circuit, as shown in Figure 20. The
initial frequency of the soft-start is given as:
f ISS = (5.2kΩ + 5.2kΩ ) ×100 + 40 (kHz) (3)
Rmin
RSS
It is typical to set the initial frequency of soft-start two ~
three times the resonant frequency (fO) of the resonant
network.
The soft-start time is three to four times of the RC time
constant. The RC time constant is as follows:
TSS = RSS CSS
fs
(4)
f ISS
40kHz
Control loop
take over
Figure 22. Control Pin Configuration for Pulse
Skipping
Remote On / Off: When an auxiliary power supply is
used for standby, the main power stage using FSFR-
series can be shut down by pulling down the control pin
voltage, as shown in Figure 23. R1 and C1 are used to
ensure soft-start when switching resumes.
time
Figure 20. Frequency Sweeping of Soft-start
4. Control Pin: The FSFR-series has a control pin for
protection, cycle skipping, and remote on/off. Figure 21
shows the internal block diagram for control pin.
www.DataSheet4U.com
Figure 23. Remote On / Off Circuit
Figure 21. Internal Block of Control Pin
Protection: When the control pin voltage exceeds 5V,
protection is triggered. Detailed applications are
described in the protection section.
Pulse Skipping: FSFR-series stops switching when the
control pin voltage drops below 0.4V and resumes
switching when the control pin voltage rises above 0.6V.
To use pulse-skipping, the control pin should be
connected to the opto-coupler collector pin. The
frequency that causes pulse skipping is given as:
SKIP = 5.2k + 4.16k x100(kHz) (5)
R min R max
5. Protection Circuits: The FSFR-series has several
self-protective functions, such as Overload Protection
(OLP), Over-Current Protection (OCP), Abnormal Over-
Current Protection (AOCP), Over-Voltage Protection
(OVP), and Thermal Shutdown (TSD). OLP, OCP, and
OVP are auto-restart mode protections; while AOCP and
TSD are latch-mode protections, as shown in Figure 24.
Auto-restart Mode Protection: Once a fault condition is
detected, switching is terminated and the MOSFETs
remain off. When LVCC falls to the LVCC stop voltage of
11.3V, the protection is reset. The FPS resumes normal
operation when LVCC reaches the start voltage of 14.5V.
© 2007 Fairchild Semiconductor Corporation
FSFR series • 1.0.3
11
www.fairchildsemi.com

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