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ACT6311 Datasheet(PDF) 6 Page - Active-Semi, Inc |
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ACT6311 Datasheet(HTML) 6 Page - Active-Semi, Inc |
6 / 10 page ACT6311 Innovative PowerTM - 6 - www.active-semi.com Copyright © 2012 Active-Semi, Inc. Rev 4, 15-Nov-12 Start-up and Inrush Current In order to facilitate quick startup, a soft-start circuit is not incorporated into the ACT6311. When the IC is first turned on with no external soft-start circuit, the peak inrush current is about 400mA. Figure 8 shows an implementation for soft-start. When soft-start and dimming controls are used simultaneously, a low frequency PWM signal (less than 10kHz) or the methods in Figures 5, 6 and 7 should be used. Open-Circuit Protection (White LEDs) If one of the LEDs is disconnected, the FB voltage drops to zero and the IC switches at maximum duty cycle. This results in a high voltage that may exceed the SW voltage rating. To limit this voltage, use a Zener diode as shown in Figure 9. The Zener voltage must be large than the total forward voltage of the LEDs and the current rating should be higher than 0.1mA. Board Layout To reduce EMI, minimize the area and path length of all traces connected to SW. Use a ground plane under the switching regulator and connect R1 directly to the G pin of the IC. ACT6311 FB R2 56k LED1 LED2 LED3 R1 62Ω R3 33.4k VDC ACT6311 FB R2 56k LED1 LED2 LED3 R1 62Ω R3 33.4k C1 0.1µF R4 10k PWM Figure 4. Current Setting for White LED Application Figure 5. DC Voltage Controlled Dimming Figure 6. Filtered PWM Controlled Dimming Figure 7. Logic Controlled Dimming ACT6311 FB LED1 LED2 LED3 R1 R2 LOGIC |
Similar Part No. - ACT6311_12 |
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Similar Description - ACT6311_12 |
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