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FPF2101 데이터시트(PDF) 9 Page - Fairchild Semiconductor |
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FPF2101 데이터시트(HTML) 9 Page - Fairchild Semiconductor |
9 / 12 page 9 www.fairchildsemi.com FPF2100-FPF2107 Rev. D2 Description of Operation The FPF2100-FPF2107 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 0.125 Ω P-channel MOSFET and a controller capable of functioning over a wide input operating range of 1.8-5.5V. The controller protects against system malfunctions through current limiting, under-voltage lockout and thermal shutdown. The current limit is preset for either 200mA or 400mA. On/OffControl The ON pin controls the state of the switch. Active HI and LO versions are available. Refer to the Ordering Information for details. 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 150°C overrides the ON control to turn off the switch. In addition, excessive currents will cause the switch to turn off in FPF2100-FPF2102 and FPF2104-FPF2107. The FPF2100, FPF2101, FPF2104 and FPF2105 have an Auto-Restart feature which will automatically turn the switch on again after 160ms. For the FPF2102 and FPF2106, the ON pin must be toggled to turn-on the switch again. The FPF2103 and FPF2107 do not turn off in response to a over current condition but instead remain operating in a constant current mode so long as ON is active and the thermal shutdown or under-voltage lockout have not activated. Fault Reporting Upon the detection of an over-current, an input under-voltage, or an over-temperature condition, the FLAGB signals the fault mode by activating LO. For the FPF2100-FPF2102 and FPF2104-FPF2106, the FLAGB goes LO at the end of the blanking time while FLAGB goes LO immediately for the FPF2103 and FPF2107. FLAGB remains LO through the Auto-Restart Time for the FPF2100, FPF2101 FPF2104 and FPF2105. For the FPF2102 and FPF2106, FLAGB is latched LO and ON must be toggled to release it.With the FPF2103 and FPF2107, FLAGB is LO during the faults and immediately returns HI at the end of the fault condition. FLAGB is an open-drain MOSFET which requires a pull-up resistor between VIN and FLAGB. During shutdown, the pull-down on FLAGB is disabled to reduce current draw from the supply. 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 FPF2100-FPF2103 the minimum current is 200mA and the maximum current is 400mA and for the FPF2104-FPF2107 the minimum current is 400mA and the maximum current is 800mA. The FPF2100-FPF2103 have a blanking time of 10ms, 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 and the FLAGB pin will activate to indicate that current limiting has occurred. The FPF2103 and FPF2107 have no current limit blanking period so immediately upon a current limit condition FLAGB is activated. These parts will remain in a constant current state until the ON pin is deactivated or the thermal shutdown turns-off the switch. Reverse Voltage If the voltage at the VOUT pin is larger than the VIN pin, large curents may flow and can cause permanent damage to the device. FPF2100-FPF2107 is designed to control current flow from VIN to VOUT. 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 part from internally or externally generated excessive temperatures. During an over-temperature condition the FLAGB is activated and 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 Current Limit [mA] Current Limit Blanking Time [ms] Auto-Restart Time [ms] ON Pin Activity Top Mark FPF2100 200 10 160 Active HI 2100 FPF2101 200 10 160 Active LO 2101 FPF2102 200 10 NA Active HI 2102 FPF2103 200 0 NA Active HI 2103 FPF2104 400 10 160 Active HI 2104 FPF2105 400 10 160 Active LO 2105 FPF2106 400 10 NA Active HI 2106 FPF2107 400 0 NA Active HI 2107 |
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