FPF2500(2006) 데이터 시트보기 (PDF) - Fairchild Semiconductor
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FPF2500 Datasheet PDF : 13 Pages
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Description of Operation
The FPF2500 - FPF2506 are current limited switches that
protect systems and loads which can be damaged or disrupted
by the application of high currents. The core of each device is
a 0.23Ω P - channel MOSFET and a controller capable
of functioning over a wide input operating range of 4.5 V -20 V.
The controller protects against system malfunctions through
current limiting under-voltage lockout and thermal shutdown.
The current limit for FPF2500, FPF2501 and FPF2502 is
adjustable from 500 mA to 2 A through the selection of an
external resistor . The FPF2503 and FPF2504 the minimum
current is internally fixed at 400 mA while that for the
FPF2505 and FPF2506 is internally fixed at 800mA.
On/Off Control
The ON pin controls the state of the switch. When ON is high,
the switch is in the on state. Activating ON continuously holds
the switch in the on state so long as there is no fault. For all
versions, an under-voltage on VIN or a junction temperature in
excess of 140°C overrides the ON control to turn off the switch.
In addition, excessive currents will cause the switch to turn off in
the FPF2500, FPF2501, FPF2503 and FPF2505. The
FPF2500, FPF2503 and FPF2505 have an Auto-Restart feature
which will automatically turn the switch on again after 640ms.
For the FPF2501, the ON pin must be toggled to turn-on the
switch again. The FPF2502, FPF2504 and FPF2506 does not
turn off in response to an over current condition but instead
remains operating in a constant current mode so long as ON is
active and the thermal shutdown or under-voltage lockout have
not activated.
Current Limiting
The current limit ensures that the current through the switch
doesn't exceed a maximum value while not limiting at less than
a minimum value. For the FPF2500, FPF2501 and FPF2502,
the current at which the parts will limit is adjustable through the
selection of an external resistor connected to ISET. Information
for selecting the resistor is found in the Application Info section.
For the FPF2503 and FPF2504 the minimum current is 400mA
and the maximum current is 800mA and for the FPF2505-
FPF2506 the minimum current is 800mA and the maximum
current is 1600mA. The FPF2500, FPF2501, FPF2503 and
FPF2505 have a blanking time of 5ms, nominally, during which
the switch will act as a constant current source. At the end of
the blanking time, the switch will be turned-off. For FPF2503
and FPF2505, at the end of the blanking time, the switch will be
turned-off and the FLAGB pin will activate to indicate that
current limiting has occurred. The FPF2502, FPF2504 and
FPF2506 have no current limit blanking period so they will
remain in a constant current state. For FPF2504 and FPF2506,
immediately upon a current limit condition FLAGB is activated.
The FPF2502, FPF2504 and FPF2506 devices will remain in
constant current state until the ON pin is cycled or the thermal
shutdown turns-off the switch.
Under-Voltage Lockout
The under-voltage lockout turns-off the switch if the input
voltage drops below the under-voltage lockout threshold. With
the ON pin active, the input voltage rising above the under-
voltage lockout threshold will cause a controlled turn-on of the
switch which limits current over-shoots.
Thermal Shutdown
The thermal shutdown protects the die from internally or
externally generated excessive temperatures. During an
over-temperature condition the switch is turned-off. The switch
automatically turns-on again if the temperature of the die drops
below the threshold temperature.
Ordering Information
Part
FPF2500
FPF2501
FPF2502
FPF2503
FPF2504
FPF2505
FPF2506
Current Limit [A]
Adjustable (0.5-2.0 +/-30%)
Adjustable (0.5-2.0 +/-30%)
Adjustable (0.5-2.0 +/-30%)
0.4/0.6/0.8
0.4/0.6/0.8
0.8/1.2/1.6
0.8/1.2/1.6
Current Limit
Blanking Time
[ms]
2.5/5/10
2.5/5/10
0
2.5/5/10
0
2.5/5/10
0
Auto-Restart
Time
[ms]
320/640/1280
NA
NA
320/640/1280
NA
320/640/1280
NA
Fault Pin
No
No
No
Yes
Yes
Yes
Yes
9
FPF2500-FPF2506 Rev. C4
www.fairchildsemi.com
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