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AL8805W5-7 Datasheet(PDF) 11 Page - Diodes Incorporated |
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AL8805W5-7 Datasheet(HTML) 11 Page - Diodes Incorporated |
11 / 16 page AL8805 HIGH EFFICIENCY 30V 1A BUCK LED DRIVER AL8805 Document number: DS35030 Rev. 1 - 2 11 of 16 www.diodes.com September 2010 © Diodes Incorporated Applications Information (cont.) PWM Dimming (cont.) 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. \ Soft Start The AL8805 does not have in-built soft-start action – this provides very fast turn off of the output the stage improving PWM dimming accuracy; nonetheless, adding an external capacitor from the CTRL pin to ground will provide a soft- start delay. This is achieved by increasing the time taken for the CTRL voltage to rise to the turn-on threshold and by slowing down the rate of rise of the control voltage at the input of the comparator. Adding a capacitor increases the time taken for the output to reach 90% of its final value, this delay is 0.1ms/nF, but will impact on the PWM dimming accuracy depending on the delay introduced. Figure 32. Soft start with 22nF capacitor on CTRL pin (VIN = 30V, ILED = 667mA, 1 LED) |
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