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AL8808 Datasheet(PDF) 11 Page - Diodes Incorporated |
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AL8808 Datasheet(HTML) 11 Page - Diodes Incorporated |
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11 / 20 page  AL8808 Document number Applicatio PWM Dimmin The CTRL pin is output stage. The ultimate PW lower switching the accuracy/line At the start of e threshold isn’t re Greater PWM d frequency. The three figure from a 12V rail a Figure 36. 0 Figure 38. 0 As can be obse value. r: DS35648 Rev. 2 on Informat ng (cont.) s designed to be WM dimming reso frequencies and earity of the PWM each PWM cycle eached then the dimming dynami s below show 0. at +25°C for a no .2% PWM Duty 68µH .2% PWM Duty 22µH rved from Figure - 2 tion (cont.) e driven by both olution is determ /or higher PWM M dimming. e the LED curre accuracy will be c ranges can be 2% duty cycle P ominal LED curre Cycle at 100Hz H Inductance Cycle at 500Hz H Inductance e 37 greater dim w 3.3V and 5V log ined by the num frequencies the ent needs to res greatly affected. e achieved by r PWM pulse resol ent of 670mA . PWM Frequenc PWM Frequenc mming accuracy c 11 of 20 www.diodes.co gic levels directly ber of full LED s number of full sw start from zero u . reducing the PW ution with differe cy and Fig cy and can be achieved m y from a logic ou switching cycles t witching cycles t up to the upper WM dimming fre ent PWM frequen gure 37. 0.2% P d by reducing bo tput with either a that can be achie that can be achie r threshold level quency and/or i ncies and differe WM Duty Cycle 22µH Indu th the PWM dim an open drain ou eved during the eved is reduced (nominally 120 ncreasing the A nt inductor value e at 100Hz PWM uctance mming frequency January 201 © Diodes Incorporate AL8808 utput or push pu PWM on-time. A thereby reducing mV/RSET). If this AL8808 switching es driving 2 LEDs Frequency and and the inducto 3 ed ll At g s g s d or |
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