Application information

STLD20CP1

10/19

Likewise, by forcing DM1 low and applying a PWM signal on pin DM2, is it possible to

achieve dimming from 0 to 5% (Figure 6), while putting DM1 high and the PWM signal on

DM2, the device performs dimming from 60% to 100% (Figure 7).

The third way is to utilize single-wire pulse dimming by connecting DM1 and DM2 together.

This feature allows the selection of additional steps of LED current through a digital signal

coming from the microprocessor, reducing the number of control traces on the PCB. When

the DM1 and DM2 are simultaneously high, the high current value is selected on the LEDs,

and each additional pulse reduces the LED current by 10%. After the tenth pulse, the LED

Figure 5.

PWM dimming method from 0% to 60%

Figure 6.

PWM dimming method from 0% to 5%

Figure 7.

PWM dimming method from 60% to 100%