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 Figure 3 : Four die than three -mode efficiency above 10%

LED Downlight

In multi-channel LED driver NCP1840 , for example, the device can help the user to create any lighting graphics, independent drive up to eight LED.

LED Strip

Since the processor is no longer required to directly control each individual LED, using NCP1840 simplifies system design by the processor is usually done the work ; through a unified control of each LED brightness and flicker rate of the serial interface write registers or read registers, can easily and dimming levels for current programming . LED brightness level can be controlled to the number of non-linear form , so that the naked eye can no brightness distortion. NCP1840 energy-efficient , low-noise four -mode charge pump that can extend battery life , ideal for portable applications .

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Figure 4: NCP1840 Typical Application Circuit

3 ) linear drive solutions

ON Semiconductor also offers a variety of 2-4 single -channel linear backlight LED drivers, such as CAT4002A, CAT4002B, CAT4003B, CAT4004A and CAT4004B so on. These backlight driver via a line interface provides 32 EZDim dimming control, with a fixed 25 mA (B type ) or adjustable (A type ) output current and less than 1 μA shutdown current very low , no switching power supply noise problem .