XLSEMI

Datasheet

4A 220KHz 36V Buck LED Constant Current Driver

XL3003

Rev 1.2

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11

Typical System Application (PWM DIMMING)

PWM dimming function can be used in typical system application with external components.

Changing the duty cycle of PWM signal can get different LED current. The PWM signal high

voltage above 3.3V(referenced to ground, lower than VIN), Low voltage below 0.2V(referenced

to ground).

Figure19. XL3003 System Parameters Test Circuit (PWM DIMMING)

Typical System Application (LED OVP)

LED OVP function can be used in typical system application with external components. The

output voltage can be limited in a suitable value by choose different zener diode when the output

LED open. the zener diode voltage choosed by output led voltage's 1.3 times.

Figure19. XL3003 System Parameters Test Circuit (LED OVP)