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PDF FSFR1800US Datasheet ( Hoja de datos )

Número de pieza FSFR1800US
Descripción Power Switch
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo

Total 15 Páginas
		
FSFR1800US Hoja de datos, Descripción, Manual
May 2010
FSFR-US 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 UniFET™s with Fast-Recovery Type
Body Diode
ƒ Fixed Dead Time (350ns) Optimized for MOSFETs
ƒ Up to 300kHz Operating Frequency
ƒ Auto-Restart Operation for All Protections with An
External LVCC
ƒ Protection Functions: Over-Voltage Protection
(OVP), 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
ƒ Telecom Power Supplies
Description
The FSFR -US seri es a re a high ly inte grated p ower
switches de signed for high-efficiency ha lf-bridge
resonant co nverters. O ffering ev erything ne cessary to
build a reliable and robust resonant converter, the FSFR-
US seri es si mplifies de signs and improves prod uctivity,
while improv ing perf ormance. T he FSFR -US serie s
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 pr otection fu nctions. T he high- side gat e-drive
circuit has a common-mode noise cancellation capability,
which gu arantees st able o peration w ith ex cellent noise
immunity. The fast-recovery body diode of the MOSFETs
improves rel iability aga inst abn ormal ope ration
conditions, w hile minimizing the e ffect of the rev erse
recovery. U sing th e z ero-voltage-switching ( ZVS)
technique dramatically reduces the switching losses and
efficiency i s significantly i mproved. T he ZVS also
reduces the sw itching no ise noticeably, w hich al lows a
small-sized Electromagnetic Interference (EMI) filter.
The FSFR-US series can be applied to various resonant
converter to pologies such as ser ies re sonant, para llel
resonant, and LLC resonant converters.
Related Resources
AN4151 — H alf-bridge LLC Resonant C onverter D esign
using FSFR-Series Fairchild Power Switch (FPSTM)
Ordering Information
Part Number
Package
Operating
Junction
Temperature
RDS(ON_MAX)
Maximum Output Power
without Heatsink
(VIN=350~400V) (1,2)
FSFR2100US
0.51Ω
180W
FSFR1800US
9-SIP
0.95Ω
120W 260
FSFR1700US
FSFR2100USL
FSFR1800USL
FSFR1700USL
9-SIP
L-Forming
-40 to +130°C
1.25Ω
0.51Ω
0.95Ω
1.25Ω
100W 200
180W 400
120W 260
100W 200
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.
Maximum Output
Power with Heatsink
(VIN=350~400V)(1,2)
400W
W
W
W
W
W
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
www.fairchildsemi.com
http://www.Datasheet4U.com

1 page

FSFR1800US pdf
Absolute Maximum Ratings (Continued)
Symbol P
arameter
MOSFET Section
VDGR
VGS
IDM
Drain Gate Voltage (RGS=1MΩ)
Gate Source (GND) Voltage
Drain Current Pulsed(5)
FSFR2100US/L
FSFR1800US/L
FSFR1700US/L
FSFR2100US/L TC=25°C
TC=100°C
ID
Continuous Drain Current FSFR1800US/L TC=25°C
TC=100°C
FSFR1700US/L TC=25°C
TC=100°C
Package Section
Torque Recommended Screw Torque
Notes:
5. Pulse width is limited by maximum junction temperature.
Min.
Max.
500
10.5
7.0
6.0
±30
32
23
20
6.5
4.5
3.9
5~7
Unit
V
V
A
A
kgf·cm
Thermal Impedance
TA=25°C unless otherwise specified.
Symbol P
arameter
θJC
Junction-to-Case Center Thermal Impedance
(Both MOSFETs Conducting)
FSFR2100US/L
FSFR1800US/L
FSFR1700US/L
Value
10.44
10.68
10.79
Unit
ºC/W
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
5
www.fairchildsemi.com

5 Page

FSFR1800US arduino
It is ty pical to set the initial frequency of sof t-start two to
three t imes th e res onant freq uency ( fO) o f the r esonant
network.
The soft-st art ti me is t hree t o four tim es of t he R C time
constant. The RC time constant is as follows:
τ = RSS CSS
(4)
For the soft-start time, ts/s it can be set as Equation (4).
L V CC
(a) (b)
( a) (b) (a) (b)
V AR
V
V
C
C
s sH
s sL
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
Figure 19. Frequency Sweeping of Soft-Start
4. Self A uto-Restart: T he FSFR -US serie s can re start
automatically ev en tho ugh a ny bui lt-in pro tections are
triggered with external supply voltage. As can be seen in
Figure 2 0 a nd Fig ure 21, once a ny prot ections are
triggered, M 1 sw itch turn s on and V-I converter i s
disabled. C SS start s to b e di scharged until V Css a cross
CSS drops to VCssL. T hen, all prote ctions ar e re set, M 1
turns off, an d V-I converter r esumes at the sa me time.
The FSFR-US starts switching again with soft-start. If the
protections oc cur w hile V Css is u nder V CssL and VCssH
level, th e sw itching i s ter minated i mmediately, V Css
continues t o i ncrease un til re aching V CssH, t hen C SS is
discharged by M1.
5. Protection Circuits: The FSFR-US series has several
self-protective functions, such as Over-Current Protection
(OCP), Abnormal Over-Current Protection (AOCP), Over-
Voltage Protection (OVP), and Thermal Shutdown (TSD).
These pr otections are aut o-restart m ode pro tections as
shown in Figure 22.
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. T he FSFR -US resumes normal operation w hen
LVCC reaches the start voltage of 12.5V.
Figure 22. Protection Blocks
Figure 20. Internal Block of AR Pin
After protections trigger, FSFR-US is disabled during the
stop-time, t stop, w here V Css d ecreases and r eaches to
VCssL. The stop-time of FSFR-US can be estimated as:
tSTOP = CSS {(}R) SS = RMIN || 5kΩ
(5)
5.1 O ver-Current Pr otection (O CP): W hen the
sensing pi n v oltage dr ops below -0.58V, O CP is
triggered and the MOSFETs remain off. This protection
has a shutdown ti me del ay of 1. 5µs to prevent
premature shutdown during startup.
5.2 A bnormal O ver-Current Protection (A OCP): If
the sec ondary rectifier diodes are shor ted, large
current w ith ex tremely hig h d i/dt can flow thro ugh th e
MOSFET before O CP is trig gered. AO CP is tri ggered
without shu tdown delay w hen the se nsing p in v oltage
drops below -0.9V.
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
11
www.fairchildsemi.com

11 Page


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