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LX2173 Datasheet(PDF) 4 Page - Microsemi Corporation |
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LX2173 Datasheet(HTML) 4 Page - Microsemi Corporation |
4 / 6 page 1.25A HIGH-EFFICIENCY 100KHZ SWITCHING REGULATOR LX2172/73 PRODUCT DA T ABOOK 1996/1997 Copyright © 1998 Rev. 0.4 a 12/04 4 P RELIMINAR Y D AT A S HEET GND 1 3 V C 21 FB 3 2 SYNC 4 ENABLE 4 V IN 55 E 1 6 V SW 74 E 2 8 Signal ground. Keep separate from power grounds (E 1 and E2). Output of transconductance error amplifier. An R-C compensation network is connected from this pin to the ground to stabilize the feedback loop. If this pin is pulled lower than 0.15V, the IC goes into micropower mode. Error amplifier inverting input. A resistor divider from the output of the converter to this pin sets its nominal voltage. LX2172 only. This pin is used to synchronize the device directly with a logic level input pulse. External synchronization frequency must always be at a higher frequency than the minimum internal clock. When not used, should be left open. LX2173 only. This pin is the input to the enable comparator. A voltage under 1.4V will put the device in micropower mode. Pin must be connected to V IN when not in use. Input supply voltage (3.0V to 25V). Power return of first transistor (Q 1). This pin must be connected to ground. Collector of output transistors. Connect to external inductor or input voltage, depending on circuit topology. Grounding this pin sets the current limit point to the maximum value. If pin is left open, the current limit is set to half its maximum value. Pin Pin # Pin # Name (8-pin Pkgs.) (5-pin TO-220) Description FUNCTIONAL PIN DESCRIPTION FUNCTIONAL PIN DESCRIPTION FUNCTIONAL PIN DESCRIPTION FUNCTIONAL PIN DESCRIPTION FUNCTIONAL PIN DESCRIPTION ELECTRICAL CHARACTERISTICS Parameter Symbol Test Conditions Units LX2172 / 2173 Min. Typ. Max. 0.2 2 µsec 26 V 0.7 V 100 400 µA 15 µA SYNC Pulse Width SYNC Input HI SYNC Input LO SYNC Input Current HI Input = 2V SYNC Input Current LO Input = 0.4V SYNC Input Section (LX2172 only) 0.4 1.2 2.4 V 200 µA 100 µA Enable Input Threshold HI Input Current Input = 2.4V LO Input Current Input = 0.4V ENABLE Section (LX2173 only) |
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