AP8802 datasheet(5/13 Pages) DIODES

tên linh kiện	AP8802

Giải thích chi tiết về linh kiện	1A LED Step-Down Converter

PDF	13 Pages

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nhà sản xuất	DIODES [Diodes Incorporated]

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AP8802

1A LED Step-Down Converter

AP8802 Rev. 1

5 of 13

MARCH 2009

www.diodes.com

LED Current Control

The LED current is controlled by the resistor RSET in Figure 2.

Connected between VIN and SET the nominal average output current in the LED(s) is defined as:

SET

THD

LED

If the CTRL pin is driven by an external voltage (lower than 2.5V), the average LED current is:

SET

THD

REF

CTRL

LED

LED current Versus RSET and VCTRL

0.2

0.33

0.39

0.47

0.56

0.39

0.47

0.56

0.68

0.82

0.2

0.33

0.47

0.68

0.82 1

1.2

1.5

1.2

1.5

0.82

0.68

1.5

1.2

200

400

600

800

1000

1200

0.15 0.3 0.45 0.6 0.75 0.9 1.05 1.2 1.35 1.5 1.65 1.8 1.95 2.1 2.25 2.4 2.55 2.7 2.85

RSET value [Ohms]

LED current @

VCTRL = 1.25V

LED current @

VCTRL = 2.5V

LED current @

VCTRL = 0.625V

Figure 3: LED Current setting Vs RSET and VCTRL

Application Information

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