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PDF FSFR1800L Datasheet ( Hoja de datos )

Número de pieza FSFR1800L
Descripción Power Switch
Fabricantes Fairchild Semiconductor 
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FSFR1800L datasheet

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FSFR1800L pdf
Absolute Maximum Ratings (Continued)
Symbol
Parameter
Min.
Max.
Unit
MOSFET Section (Continued)
ID Continuous Drain Current
Package Section
FSFR2100U
FSFR2000
FSFR1900
FSFR1800
FSFR1700
FSFR1600
TC=25°C
TC=100°C
TC=25°C
TC=100°C
TC=25°C
TC=100°C
TC=25°C
TC=100°C
TC=25°C
TC=100°C
TC=25°C
TC=100°C
10.5
6.5
9.5
6.0
8.0
5.0
A
7.0
4.5
6.0
3.9
4.5
2.7
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.
Thermal Impedance
TA=25°C unless otherwise specified.
Symbol
Parameter
θJC
Junction-to-Case Center Thermal Impedance
(Both MOSFETs Conducting)
FSFR2100U
FSFR2000
FSFR1900
FSFR1800
FSFR1700
FSFR1600
Value
10.44
10.44
10.56
10.68
10.79
10.89
Unit
ºC/W
© 2007 Fairchild Semiconductor Corporation
FSFR series Rev.1.0.9
5
www.fairchildsemi.com

5 Page

FSFR1800L arduino
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)
Rmin
RSS
(3)
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
(4)
fs
f ISS
40kHz
Control loop
take over
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.
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.
FPS
RT
Rmin
R1
C1
OP1
Main
Output
Main Off
Aux
Output
CON
OP1
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)
R min R max
(5)
4. Current Sensing Method
Current Sensing Using Resistor: FSFR-series senses
drain current as a negative voltage, as shown in Figure
24 and Figure 25. Half-wave sensing allows low power
dissipation in the sensing resistor, while full-wave
sensing has less switching noise in the sensing signal.
© 2007 Fairchild Semiconductor Corporation
FSFR series Rev.1.0.9
11
www.fairchildsemi.com

11 Page





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