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FPF2195 Datasheet(PDF) 11 Page - Fairchild Semiconductor

Part # FPF2195
Description  Full-Function Load Switch with Adjustable Current Limit
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FPF2195 Datasheet(HTML) 11 Page - Fairchild Semiconductor

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© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FPF2193/4/5 • Rev. 1.0.5
11
Application Information
Figure 28.
Typical Application
Setting Current Limit
The FPF2193, FPF2194, and FPF2195 current limit is
set with an external resistor connected between ISET and
GND. This resistor is selected using the following
equation:
LIM
SET
I
6
.
551
R
=
(1)
RSET is in
Ω and ISET is in Amps.
Table 1 can also be used to select RSET. A typical
application would be the 500 mA current required by a
single USB port. Using Table 1, an appropriate selection
for the RSET resistor would be 788 Ω. This ensures that
the port load could draw 525 mA, but not more than
875 mA. Likewise for a dual-port system; an RSET of
368 Ω always delivers at least 1125 mA and never more
than 1875 mA.
Table 1.
Current Limit Various RSET Values
RSET(
Ω)
Min. Current
Limit (mA)
Typ. Current
Limit (mA)
Max. Current
Limit (mA)
368
1125
1500
1875
441
928
1250
1562
552
750
1000
1250
613
675
900
1125
690
600
800
1000
788
525
700
875
919
450
600
750
1103
375
500
625
1226
338
450
563
1379
300
400
500
1576
263
350
438
1839
225
300
375
2206
188
250
313
2758
150
200
250
3677
113
150
188
5516
75
100
125
Input Capacitor
To limit the voltage drop on the input supply caused by
transient inrush currents when the switch is turned on
into a discharged load capacitor or a short-circuit, a
capacitor needs to be placed between VIN and GND. A
0.1 µF ceramic capacitor, CIN, placed close to the pins is
usually sufficient. Higher values of CIN can be used to
further reduce the voltage drop.
Output Capacitor
A 0.1 µF capacitor, COUT, should be placed between
VOUT and GND. This capacitor prevents parasitic board
inductances from forcing VOUT below GND when the
switch turns off. For the FPF2193 and FPF2194, the
total output capacitance needs to be kept below a
maximum value, COUT(max), to prevent the part from
registering an over-current condition and turning off the
switch. The maximum output capacitance can be
determined from the following formula:
IN
BLANK
LIM
OUT
V
(min)
t
(max)
I
(max)
C
×
=
(2)
Power Dissipation
During normal operation as a switch, the power
dissipated depends upon the level at which the current
limit is set. The maximum allowed setting for the current
limit is 1.5 A and results in a power dissipation of:
mW
75
.
123
055
.
0
)
5
.
1
(
R
)
I
(
P
2
ON
2
LIM
=
×
=
×
=
(3)
If the part goes into current limit, the maximum power
dissipation occurs when the output is shorted to ground.
For the FPF2193, the power dissipation scales by the
auto-restart time, tRSTRT, and the over-current blanking
time, tBLANK, so that the maximum power dissipated is:
mW
6
.
515
5
.
1
5
.
5
450
30
30
(max)
I
(max)
V
t
t
t
(max)
P
LIM
IN
RSTRT
BLANK
BLANK
=
×
×
+
=
×
×
+
=
(4)


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