FPF2500(2006) 查看數據表（PDF） - Fairchild Semiconductor
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FPF2500 Datasheet PDF : 13 Pages
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Application Information
Typical Application
Battery
12V
OFF ON
C1=10uF
5.5V max
VIN
VOUT
FPF2500-FPF2502
ON
ISET
GND
RSET
C2=1uF
R2=240Ω
Battery
12V
-
5.5V max
OFF ON
C1=10uF
5.5V max
VIN
VOUT
FPF2503-FPF2506
ON
FLAGB
GND
R1=100KΩ
C2=1uF
R2=240Ω
Setting Current Limit
The FPF2500, FPF2501, and FPF2502 have a current limit
which is set with an external resistor connected between ISET
and GND. This resistor is selected by using the following
equation,
RSET
=
12500
×
ISET
×
( 0.485
e
×
ISET)
(1)
RSET is in Ohms and ISET is in Amps
The following table can also be used to select RSET. A typical
application would be the 0.500A current that is required by a
single USB port. Using the table below an appropriate selection
for the RSET resistor would be 12.4KΩ. This will ensure that the
port load could draw 0.525A, but not more than 0.875A.
Likewise for a dual port system, an RSET of 34.8KΩ would
always deliver at least 1.050A and never more than 1.750A.
Input Capacitor
To limit the voltage drop on the input supply caused by transient
in-rush currents when the switch turns-on into a discharged load
capacitor or a short-circuit, a capacitor needs to be placed
between VIN and GND. A 0.1uF ceramic capacitor, CIN, placed
close to the pins is usually sufficient. Higher values of CIN can
be used to further reduce the voltage drop.
Current Limit Various RSET Values
RSET
[KΩ]
Min. Current Typ. Current Max. Current
Limit
Limit
Limit
[A]
[A]
[A]
7.87
0.375
0.500
0.625
10.0
0.450
0.600
0.750
12.4
0.525
0.700
0.875
14.7
0.600
0.800
1.000
17.4
0.675
0.900
1.125
20.5
0.750
1.000
1.250
23.2
0.825
1.100
1.375
26.7
0.900
1.200
1.500
30.9
0.975
1.300
1.625
34.8
1.050
1.400
1.750
39.0
1.125
1.500
1.875
43.2
1.200
1.600
2.000
48.7
1.275
1.700
2.125
53.6
1.350
1.800
2.250
29.0
1.425
1.900
2.375
64.9
1.500
2.000
2.500
10
FPF2500-FPF2506 Rev. C4
www.fairchildsemi.com
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