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LEDD24_24 – Rev. 2018-1.3

Specifications subject to change without notice.

LEDD24_24 Series

Constant current power DIP24 LED Driver - Wide Input - Non-Isolated & Regulated

Digital dimming control

Analogue dimming control and application sample

Where, Io_set represents required output current (mA); D represents the

duty ratio (%) of PWM signal; T represents the period (ms) of PWM sig-

nal; and Io_norm represents the rated output value (mA) of the driver.

Note: The above formula is for reference only; and deviation of output

current may exist due to various loads. The min. conducted time of PWM

signal shall not be less than 0.75ms, or the product will be in abnormal

operation; in case of low voice from the driver during PWM dimming, it

is normal since the PWM dimming frequency is within the auditory fre-

quency range of human ears (20Hz-20KHz in general). To prevent seeing

flash of the LED by human eyes, it is suggested to set the PWM dimming

frequency between 100-200Hz.

The voltage drop of all LEDs in the datasheet is 3.3-3.8V）during actual

application, the number of LEDs can be confirmed based on the actual

voltage drop and output voltage of LEDs.

This product does not support hot-Plug use.

Analogue dimming circuit

Analogue input voltage vs. output

LEDD24_24-1200

LEDD124_24-1000

LEDD24_24-1200

LEDD24_24-1000