lm2707 National Semiconductor Corporation, lm2707 Datasheet - Page 8

• Manufacturer Part Number: lm2707
• Description: Inductive-boost Series Led Driver With Programmable Oscillator Frequency
• Manufacturer: National Semiconductor Corporation

www.national.com
Typical Performance Characteristics
(Coilcraft DT1608C-223), D = MBR0520L (Vishay), C
* 20mA, 4-LED operation requires increasing the current limit.
A 1Ω resistor was placed between the V
Note 11: LED drive efficiency is the ratio of the power consumed by the LEDs
to the power drawn at the LM2707 input (E = P
forward voltage characteristics of the LEDs used for the efficiency curve data: I
= 5mA: V
= 3.7V.
F
= 3.1V; I
LED Drive Efficiency vs. Supply Voltage
LED Drive Efficiency vs. Supply Voltage
F
= 10mA: V
2 LEDs (Note 11)
4 LEDs (Note 11)
F
= 3.3V; I
IN
F
and L
= 15mA: V
LEDs
X
pins.
/ P
F
= 3.5V; I
IN
). Approximate LED
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F
= 20mA: V
IN
= 1.0µF, C
F
F
Unless otherwise specified: V
8
OUT
= 2x1µF, C
LED Drive Efficiency vs. Supply Voltage
LED Current vs. Duty Cycle
x
= 68pF, T
3 LEDs (Note 11)
IN
= 3.0V, V
A
= 25
o
C. (Continued)
EN
= 3.0V, L = 22µH
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