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FSFR-US Series — Fairchild Power Switch (FPS™)
for Half-Bridge Resonant Converters
Features
Description
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
Fixed Dead Time (350ns) Optimized for MOSFETs
Up to 300kHz Operating Frequency
Auto-Restart Operation for All Protections with An
External LVCC
Protection Functions: Over-Voltage Protection
(OVP), 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
The FSFR-US 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 FSFRUS series simplifies designs and improves productivity,
while improving performance. The FSFR-US 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-US 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
TM
using FSFR-Series Fairchild Power Switch (FPS )
Ordering Information
Part Number
Package
Operating
Junction
Temperature
FSFR2100US
FSFR1800US
9-SIP
FSFR1700US
-40 to +130°C
FSFR2100USL
FSFR1800USL
9-SIP
L-Forming
FSFR1700USL
RDS(ON_MAX)
Maximum Output Power
without Heatsink
(1,2)
(VIN=350~400V)
Maximum Output
Power with Heatsink
(1,2)
(VIN=350~400V)
0.51Ω
180W
400W
0.95Ω
120W
260W
1.25Ω
100W
200W
0.51Ω
180W
400W
0.95Ω
120W
260W
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.
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
www.fairchildsemi.com
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
May 2010
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Application Circuit Diagram
Figure 1. Typical Application Circuit (LLC Resonant Half-Bridge Converter)
Block Diagram
Figure 2. Internal Block Diagram
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
www.fairchildsemi.com
2
Figure 3. Package Diagram
Pin Definitions
Pin #
Name
Description
1
VDL
This is the drain of the high-side MOSFET, typically connected to the input DC link voltage.
2
AR
This pin is for discharging the external soft-start capacitor when any protections are
triggered. When the voltage of this pin drops to 0.2, all protections are reset and the
controller starts to operate again.
3
RT
This pin programs the switching frequency. Typically, an opto-coupler is connected to control
the switching frequency for the output voltage regulation.
4
CS
This pin senses the current flowing through the low-side MOSFET. Typically, negative
voltage is applied on this pin.
5
SG
This pin is the control ground.
6
PG
7
LVCC
This pin is the power ground. This pin is connected to the source of the low-side MOSFET.
8
NC
9
HVCC
This is the supply voltage of the high-side gate-drive circuit IC.
10
VCTR
This is the drain of the low-side MOSFET. Typically, a transformer is connected to this pin.
This pin is the supply voltage of the control IC.
No connection.
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
www.fairchildsemi.com
3
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Pin Configuration
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. TA=25°C unless otherwise specified.
Symbol
VDS
LVCC
Parameter
Min.
Unit
Maximum Drain-to-Source Voltage
(VDL-VCTR and VCTR-PG)
500
Low-Side Supply Voltage
-0.3
25.0
V
-0.3
25.0
V
-0.3
525.0
V
HVCC to VCTR High-Side VCC Pin to Low-Side Drain Voltage
HVCC
Max.
High-Side Floating Supply Voltage
V
VAR
Auto-Restart Pin Input Voltage
-0.3
LVCC
V
VCS
Current Sense (CS) Pin Input Voltage
-5.0
1.0
V
VRT
RT Pin Input Voltage
-0.3
5.0
V
50
V/ns
dVCTR/dt
PD
TJ
TSTG
Allowable Low-Side MOSFET Drain Voltage Slew Rate
Total Power Dissipation
(3)
Maximum Junction Temperature
FSFR2100US/L
12.0
FSFR1800US/L
11.7
FSFR1700US/L
11.6
(4)
W
+150
(4)
Recommended Operating Junction Temperature
-40
+130
Storage Temperature Range
-55
+150
°C
°C
Notes:
3. Per MOSFET when both MOSFETs are conducting.
4. The maximum value of the recommended operating junction temperature is limited by thermal shutdown.
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
www.fairchildsemi.com
4
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Absolute Maximum Ratings
Symbol
Parameter
Min.
Max.
Unit
MOSFET Section
VDGR
Drain Gate Voltage (RGS=1MΩ)
VGS
Gate Source (GND) Voltage
IDM
Drain Current Pulsed
(5)
500
±30
FSFR2100US/L
32
FSFR1800US/L
23
FSFR1700US/L
20
FSFR2100US/L
ID
Continuous Drain Current
V
FSFR1800US/L
FSFR1700US/L
TC=25°C
10.5
TC=100°C
6.5
TC=25°C
7.0
TC=100°C
4.5
TC=25°C
6.0
TC=100°C
3.9
V
A
A
Package Section
Torque
Recommended Screw Torque
5~7
kgf·cm
Notes:
5. Pulse width is limited by maximum junction temperature.
Thermal Impedance
TA=25°C unless otherwise specified.
Symbol
θJC
Parameter
Junction-to-Case Center Thermal Impedance
(Both MOSFETs Conducting)
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
Value
FSFR2100US/L
10.44
FSFR1800US/L
10.68
FSFR1700US/L
10.79
Unit
ºC/W
www.fairchildsemi.com
5
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Absolute Maximum Ratings (Continued)
TA=25°C unless otherwise specified.
Specifications
Symbol
Parameter
Test Conditions
Unit
Min.
Typ.
Max.
MOSFET Section
BVDSS
RDS(ON)
Drain-to-Source Breakdown Voltage
500
V
540
ID=200μA, TA=125°C
FSFR2100US/L VGS=10V, ID=6.0A
0.41
0.51
On-State Resistance FSFR1800US/L VGS=10V, ID=3.0A
0.77
0.95
FSFR1700US/L VGS=10V, ID=2.0A
1.00
1.25
FSFR2100US/L
trr
ID=200μA, TA=25°C
VGS=0V, IDiode=12.0A,
dIDiode/dt=100A/μs
120
Body Diode Reverse
V =0V, IDiode=7.0A,
FSFR1800US/L GS
(6)
Recovery Time
dIDiode/dt=100A/μs
160
VGS=0V, IDiode=6.0A,
dIDiode/dt=100A/μs
160
FSFR1700US/L
Ω
ns
Supply Section
ILK
Offset Supply Leakage Current
H-VCC=VCTR=500V
50
μA
IQHVCC
Quiescent HVCC Supply Current
(HVCCUV+) - 0.1V
50
120
μA
IQLVCC
Quiescent LVCC Supply Current
(LVCCUV+) - 0.1V
100
200
μA
IOHVCC
Operating HVCC Supply Current
(RMS Value)
fOSC=100KHz
6
9
mA
No Switching
100
200
μA
IOLVCC
Operating LVCC Supply Current
(RMS Value)
fOSC=100KHz
7
11
mA
No Switching
2
4
mA
UVLO Section
LVCCUV+
LVCC Supply Under-Voltage Positive Going Threshold (LVCC Start)
11.2
12.5
13.8
V
LVCCUV-
LVCC Supply Under-Voltage Negative Going Threshold (LVCC Stop)
8.90
10.0
11.1
V
LVCCUVH
LVCC Supply Under-Voltage Hysteresis
HVCCUV+
HVCC Supply Under-Voltage Positive Going Threshold (HVCC Start)
8.2
9.2
10.2
V
HVCCUV-
HVCC Supply Under-Voltage Negative Going Threshold (HVCC Stop)
7.8
8.7
9.6
V
HVCCUVH
HVCC Supply Under-Voltage Hysteresis
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
2.50
0.5
V
V
www.fairchildsemi.com
6
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Electrical Characteristics
TA=25°C unless otherwise specified.
Specifications
Symbol
Parameter
Unit
Test Conditions
Min
Typ
Max
1.5
2.0
2.5
V
94
100
106
KHz
48
50
52
%
Oscillator & Feedback Section
VRT
V-I Converter Threshold Voltage
fOSC
Output Oscillation Frequency
DC
Output Duty Cycle
fSS
Internal Soft-Start Initial Frequency
tSS
Internal Soft-Start Time
RT=5.2KΩ
fSS=fOSC+40kHz,
RT=5.2KΩ
140
KHz
2
3
4
ms
Protection Section
VCssH
Beginning Voltage to Discharge CSS
0.9
1.0
1.1
V
VCssL
Beginning Voltage to Charge CSS and Restart
0.16
0.20
0.24
V
VOVP
LVCC Over-Voltage Protection
L-VCC > 21V
21
23
25
V
VAOCP
AOCP Threshold Voltage
ΔV/Δt=-0.1V/µs
-1.0
-0.9
-0.8
V
tBAO
AOCP Blanking Time
VCS < VAOCP;
ΔV/Δt=-0.1V/µs
VOCP
OCP Threshold Voltage
V/Δt=-1V/µs
(6)
tBO
OCP Blanking Time
VCS < VOCP;
ΔV/Δt=-1V/µs
tDA
Delay Time (Low Side) Detecting from VAOCP
(6)
to Switch Off
ΔV/Δt=-1V/µs
TSD
Thermal Shutdown Temperature
(6)
(6)
50
ns
-0.64
-0.58
-0.52
V
1.0
1.5
2.0
μs
250
400
ns
135
150
°C
120
Dead-Time Control Section
DT
(7)
Dead Time
350
ns
Notes:
6. This parameter, although guaranteed, is not tested in production.
7. These parameters, although guaranteed, are tested only in EDS (wafer test) process.
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
www.fairchildsemi.com
7
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Electrical Characteristics (Continued)
1.1
1.1
1.05
1.05
Normalized at 25OC
Normalized at 25OC
These characteristic graphs are normalized at TA=25ºC.
1
0.95
1
0.95
0.9
0.9
-50
-25
0
25
50
75
-50
100
-25
0
Temp (OC)
50
75
100
Figure 5. Switching Frequency vs. Temperature
1.1
1.1
1.05
1.05
Normalized at 25OC
Normalized at 25OC
Figure 4. Low-Side MOSFET Duty Cycle
vs. Temperature
1
0.95
0.9
1
0.95
0.9
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temp (OC)
Temp (OC)
Figure 6. High-Side VCC (HVCC) Start vs. Temperature
Figure 7. High-Side VCC (HVCC) Stop vs. Temperature
1.1
1.1
1.05
1.05
Normalized at 25OC
Normalized at 25OC
25
Temp (OC)
1
0.95
1
0.95
0.9
0.9
-50
-25
0
25
50
75
-50
100
Figure 8. Low-Side VCC (LVCC) Start vs. Temperature
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
-25
0
25
50
75
100
Temp (OC)
Temp (OC)
Figure 9. Low-Side VCC (LVCC) Stop vs. Temperature
www.fairchildsemi.com
8
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Typical Performance Characteristics
1.1
1.1
1.05
1.05
Normalized at 25OC
Normalized at 25OC
These characteristic graphs are normalized at TA=25ºC.
1
0.95
0.9
1
0.95
0.9
-50
-25
0
25
50
75
100
-50
-25
0
25
Temp (OC)
Figure 10. LVCC OVP Voltage vs. Temperature
75
100
Figure 11. RT Voltage vs. Temperature
1.10
1.10
1.05
1.05
Normalized at 25Ԩ
Normalized at 25Ԩ
50
Temp (OC)
1.00
0.95
0.90
1.00
0.95
0.90
-50
-25
0
25
50
Temp(Ԩ)
75
-50
100
Figure 12. VCssL vs. Temperature
-25
0
25
50
Temp(Ԩ)
75
100
Figure 13. VCssH vs. Temperature
1.1
Normalized at 25OC
1.05
1
0.95
0.9
-50
-25
0
25
50
75
100
Temp (OC)
Figure 14. OCP Voltage vs. Temperature
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
www.fairchildsemi.com
9
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Typical Performance Characteristics (Continued)
1. Basic Operation: FSFR-US series is designed to
drive high-side and low-side MOSFETs complementarily
with 50% duty cycle. A fixed dead time of 350ns is
introduced between consecutive transitions, as shown in
Figure 15.
Figure 15. MOSFETs Gate Drive Signal
2. Internal Oscillator: FSFR-US series employs a
current-controlled oscillator, as shown in Figure 16.
Internally, the voltage of RT pin is regulated at 2V and the
charging / discharging current for the oscillator capacitor,
CT, is obtained by copying the current flowing out of the
RT pin (ICTC) using a current mirror. Therefore, the
switching frequency increases as ICTC increases.
FSFR-US
Figure 17. Resonant Converter Typical Gain Curve
Figure 16. Current Controlled Oscillator
Figure 18. Frequency Control Circuit
3. Frequency Setting: Figure 17 shows the typical
voltage gain curve of a resonant converter, where the
gain is inversely proportional to the switching frequency
in the ZVS region. The output voltage can be regulated
by modulating the switching frequency. Figure 18 shows
the typical circuit configuration for the RT pin, where the
opto-coupler transistor is connected to the RT pin to
modulate the switching frequency.
To prevent excessive inrush current and overshoot of
output voltage during startup, increase the voltage gain
of the resonant converter progressively. Since the
voltage gain of the resonant converter is inversely
proportional to the switching frequency, the soft-start is
implemented by sweeping down the switching frequency
ISS
from an initial high frequency (f ) until the output
voltage is established. The soft-start circuit is made by
connecting R-C series network on the RT pin, as shown
in Figure 18. FSFR-US series also has an internal softstart 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 19. The
initial frequency of the soft-start is given as:
The minimum switching frequency is determined as:
f min =
5.2k Ω
× 100(kHz)
Rmin
(1)
Assuming the saturation voltage of opto-coupler
transistor is 0.2V, the maximum switching frequency is
determined as:
f max
5.2 k Ω 4.68k Ω
=(
+
) × 100(kHz )
Rmin
Rmax
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
f ISS = (
5.2k Ω 5.2k Ω
+
) × 100 + 40 (kHz )
Rmin
RSS
(3)
(2)
www.fairchildsemi.com
10
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Functional Description
For the soft-start time, ts/s it can be set as Equation (4).
(a )
The soft-start time is three to four times of the RC time
constant. The RC time constant is as follows:
τ = RSS • CSS
(b )
( a)
(b ) (a )
(b )
L V CC
V AR
V C ssH
V C ssL
(4)
ICr
t stop
tS /S
(a ) P r o te ction s a r e tr igge r e d, ( b ) F S F R- U S r e sta r ts
Figure 21. Self Auto-Restart Operation
5. Protection Circuits: The FSFR-US series has several
self-protective functions, such as Over-Current Protection
(OCP), Abnormal Over-Current Protection (AOCP), OverVoltage Protection (OVP), and Thermal Shutdown (TSD).
These protections are auto-restart mode protections as
shown in Figure 22.
Figure 19. Frequency Sweeping of Soft-Start
4. Self Auto-Restart: The FSFR-US series can restart
automatically even though any built-in protections are
triggered with external supply voltage. As can be seen in
Figure 20 and Figure 21, once any protections are
triggered, M1 switch turns on and V-I converter is
disabled. CSS starts to be discharged until VCss across
CSS drops to VCssL. Then, all protections are reset, M1
turns off, and V-I converter resumes at the same time.
The FSFR-US starts switching again with soft-start. If the
protections occur while VCss is under VCssL and VCssH
level, the switching is terminated immediately, VCss
continues to increase until reaching VCssH, then CSS is
discharged by M1.
Once a fault condition is detected, switching is terminated
and the MOSFETs remain off. When LVCC falls to the LVCC
stop voltage of 10V or AR signal is HIGH, the protection is
reset. The FSFR-US resumes normal operation when
LVCC reaches the start voltage of 12.5V.
Figure 22. Protection Blocks
5.1 Over-Current Protection (OCP): When the
sensing pin voltage drops below -0.58V, OCP is
triggered and the MOSFETs remain off. This protection
has a shutdown time delay of 1.5µs to prevent
premature shutdown during startup.
5.2 Abnormal Over-Current Protection (AOCP): If
the secondary rectifier diodes are shorted, large
current with extremely high di/dt can flow through the
MOSFET before OCP is triggered. AOCP is triggered
without shutdown delay when the sensing pin voltage
drops below -0.9V.
Figure 20. Internal Block of AR Pin
After protections trigger, FSFR-US is disabled during the
stop-time, tstop, where VCss decreases and reaches to
VCssL. The stop-time of FSFR-US can be estimated as:
t STOP = CSS • {(RSS = RMIN ) || 5 kΩ}
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
(5)
www.fairchildsemi.com
11
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
It is typical to set the initial frequency of soft-start two to
three times the resonant frequency (fO) of the resonant
network.
7. PCB Layout Guidelines: Duty unbalance problems
may occur due to the radiated noise from main
transformer, the inequality of the secondary side leakage
inductances of main transformer, and so on. Among
them, it is one of the dominant reasons that the control
components in the vicinity of RT pin are enclosed by the
primary current flows pattern on PCB layout. The
direction of the magnetic field on the components caused
by the primary current flow is changed when the high-and
low-side MOSFET turn on by turns. The magnetic fields
with opposite directions induce a current through, into, or
out of the RT pin, which makes the turn-on duration of
each MOSFET different. It is strongly recommended to
separate the control components in the vicinity of RT pin
from the primary current flow pattern on PCB layout.
Figure 25 shows an example for the duty-balanced case.
5.4 Thermal Shutdown (TSD): The MOSFETs and
the control IC in one package makes it easy for the
control IC to detect the abnormal over-temperature of
the MOSFETs. If the temperature exceeds
approximately 130°C, the thermal shutdown triggers.
6. Current Sensing Using Resistor: FSFR-US series
senses drain current as a negative voltage, as shown in
Figure 23 and Figure 24. Half-wave sensing allows low
power dissipation in the sensing resistor, while full-wave
sensing has less switching noise in the sensing signal.
Cr
Np
Ns
Ns
Control
IC
VCS
Ids
CS
SG
PG
Rsense
VCS
Ids
Figure 25. Example for Duty Balancing
Figure 23. Half-Wave Sensing
Ids
VCS
Cr
Control
IC
VCS
Np
CS
PG
SG
Rsense
Ns
Ns
Ids
Figure 24. Full-Wave Sensing
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
www.fairchildsemi.com
12
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
5.3 Over-Voltage Protection (OVP): When the LVCC
reaches 23V, OVP is triggered. This protection is used
when auxiliary winding of the transformer to supply VCC
to FPS is utilized.
26.20
25.80
3.4 0
3.0 0
23.10
22.90
(1.7 0)
(1.2 0)
(R0.5 0)
5.35
5.15
10 .70
10 .30
(1 1.0 0)
1 4.50
1 3.50
(0 .7 0)
R0 .55
8.00
7.00
(0.5 0)
1 8.50
1 7.50
R0 .55
M AX 1.30
(7 .0 0)
1.3 0
1.1 0
(5 .0 8)
1 .27
0.60
0.40
MAX 0.80
0.7 0
0.5 0
3.4 8
2 .88
1 5.24
(R0.5 0)
3.4 0
3.0 0
N OTES: UNL ESS O THERW IS E S P ECIFIED
A) THIS PACKAG E DO ES N OT COM PLY
TO ANY CURRENT PACKAGIN G STAN DAR D.
B) ALL DIM ENSIO NS ARE IN MIL LIMETERS.
C) DIMENSIO NS ARE EXCLUSIVE OF BU R RS,
MOL D FL ASH, AND TIE BAR EXT RUSIONS.
SIPMO DAA0 9revA
Figure 26. 9-SIP Package
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specifically the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
www.fairchildsemi.com
13
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Physical Dimensions
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
Physical Dimensions
Figure 27. 9-SIP L-Forming Package
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
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specifically the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
www.fairchildsemi.com
14
FSFR-US Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
www.fairchildsemi.com
15
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