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SBR2U30P1-7 Datasheet(PDF) 8 Page - Diodes Incorporated |
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SBR2U30P1-7 Datasheet(HTML) 8 Page - Diodes Incorporated |
8 / 15 page AL8806 Document number: DS35144 Rev. 5 - 2 8 of 15 www.diodes.com July 2013 © Diodes Incorporated AL8806 Application Information (cont.) PWM Dimming LED current can be adjusted digitally, by applying a low frequency Pulse Width Modulated (PWM) logic signal to the CTRL pin to turn the device on and off. This will produce an average output current proportional to the duty cycle of the control signal. In particular, a PWM signal with a max resolution of 10bit can be applied to the CTRL pin to change the output current to a value below the nominal average value set by resistor RSET. To achieve this resolution the PWM frequency has to be lower than 500Hz, however higher dimming frequencies can be used - at the expense of dimming dynamic range and accuracy. Typically, for a PWM frequency of 500Hz the accuracy is better than 1% for PWM ranging from 1% to 100%. 0 100 200 300 400 500 600 700 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% PWMdimming [%] Figure 2 PWM Dimming at 500Hz 0 10 20 30 40 50 60 70 0% 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% PWMdimming [%] Figure 3 Low Duty Cycle PWM Dimming at 500Hz The PWM pin is designed to be driven by both 3.3V and 5V logic levels directly from a logic output with either an open drain output or push-pull output stage. |
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