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LM2707MFX Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM2707MFX Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 19 page Typical Performance Characteristics Unless otherwise specified: V IN = 3.0V, VEN = 3.0V, L = 22µH (Coilcraft DT1608C-223), D = MBR0520L (Vishay), C IN = 1.0µF, COUT = 2x1µF, Cx = 68pF, TA =25 oC. (Continued) LED Drive Efficiency vs. Supply Voltage 2 LEDs (Note 11) LED Drive Efficiency vs. Supply Voltage 3 LEDs (Note 11) 20099218 20099219 LED Drive Efficiency vs. Supply Voltage 4 LEDs (Note 11) LED Current vs. Duty Cycle 20099253 * 20mA, 4-LED operation requires increasing the current limit. A1 Ω resistor was placed between the VIN and LX pins. Note 11: LED drive efficiency is the ratio of the power consumed by the LEDs to the power drawn at the LM2707 input (E = PLEDs /PIN). Approximate LED forward voltage characteristics of the LEDs used for the efficiency curve data: IF = 5mA: VF = 3.1V; IF = 10mA: VF = 3.3V; IF = 15mA: VF = 3.5V; IF = 20mA: VF = 3.7V. 20099209 www.national.com 8 |
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