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LEDW10_24 – Rev. 2018-1.1

Specifications subject to change without notice.

LEDW10_24 Series

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

PWM dimming control

For PWM dimming signals with a certain frequency, the output current

of the driver is related to the duty ratio of PWM signal. Refer to the

formula for the calculation method:

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 formula is for reference only; and deviation of output cur-

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

signal shall not be less than 0.8ms, 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.

EMI/RFI conducted EN55022 Class B recommended circuit

Components

Specifications

C1

225K/50V 1210 ×7R (TORCH)

C2, C4

104K/50V 1210 ×7R (TORCH)

L1

PI043-131MT (SHENZHEN

CEAIYA)

Note:

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 control and application sample

Analogue dimming circuit

Analogue input voltage and output current

LEDW10_24-xxx

LEDW10_24-xxx

LEDW10_24-xxx