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PDF FSFR1800US Datasheet ( Hoja de datos )

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

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

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