AL5802

Document number: DS35516 Rev. 9 - 2

8 of 11

www.diodes.com

March 2014

© Diodes Incorporated

AL5802

PWM dimming can be achieved by driving the EN pin. An external open-collector NPN transistor or open-drain N-channel MOSFET can be used

to drive the EN pin as shown in Figure 16. 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. Figure 17 is a typical response of LED current vs. PWM duty cycle on the EN pin.

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Fig. 16 Application Circuits for LED Driver with PWM Dimming Functionality

Fig. 17 Typical LED current response vs. PWM duty cycle for

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PWM DUTY CYCLE (%)

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