LM3414SDX National Semiconductor Corporation, LM3414SDX Datasheet - Page 16

• Manufacturer Part Number: LM3414SDX
• Description: Lm3414/lm3414hv 1a 60w* Common Anode Capable Constant Current Buck Led Driver Requires No External Current Sensing Resistor
• Manufacturer: National Semiconductor Corporation

www.national.com
ANALOG DIMMING CONTROL
The IADJ pin can be used as an analog dimming signal input.
As the average output current of the LM3414 depends on the
current being drawn from the IADJ pin, thus the LED current
When external bias current I
reduction of LED current follows the equations:
Provided that
EXT
is applied to the IADJ pin, the
FIGURE 6. Analog LED Current Control Circuit
16
can be increased or decreased by applying external bias cur-
rent to the IADJ pin. The simplified circuit diagram for facili-
tating analog dimming is as shown in figure 6.
I
This feature is exceptionally useful for the applications with
analog dimming control signals such as those from analog
temperature sensors and ambient light sensors.
LED
decreases linearly as I
EXT
increases.
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