LM2707 datasheet(8/19 Pages) NSC

Teilenummer	LM2707

Bauteilbeschribung	Inductive-Boost Series LED Driver with Programmable Oscillator Frequency

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Hersteller	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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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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