BCR421UW6Q Datasheet, PDF (8/11 Pages) Diodes Incorporated – Linear LED Constant Current Regulator in SOT26

BCR421UW6Q
Application Information (Continued)
PWM dimming can be achieved by driving the EN pin. Dimming is achieved by turning the LEDs ON and OFF for a portion of a single cycle. The
PWM signal can be provided by a micro-controller or analog circuitry; typical circuit is shown in Figure 3. Figure 4 is a typical response of LED
current vs. PWM duty cycle on the EN pin.
Figure 3 Application Circuits for LED Driver with PWM Dimming Functionality
Figure 4 Typical LED Current Response vs. PWM Duty Cycle for
400Hz PWM Frequency
BCR421UW6Q
Document number: DS38302 Rev. 1 - 2
8 of 11
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October 2015
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