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AL8808 Datasheet(PDF) 13 Page - Diodes Incorporated |
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AL8808 Datasheet(HTML) 13 Page - Diodes Incorporated |
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13 / 20 page  AL8808 Document number Applicatio Inductor Sele Recommended data for selecte required switchi LED current acc The inductor sho The chosen coil required mean o Suitable coils for Part MSS1038-333 MSS1038-683 NPIS64D330M The inductor val The following eq Switch ‘On’ tim V t IN ON − = Switch ‘Off’ tim V t L OFF = Where: L is the coil rL is the coil RS is the cur Iavg is the re VIN is the su ΔI is the coil VLED is the t RSW is the s VD is the dio r: DS35648 Rev. 2 on Informat ection inductor values ed component va ng frequency. L curacy (due to pro ould be mounted should have a s output current. r use with the AL No. MTRF ue should be cho quations can be u me: x I V L AVG LED − − Δ me: I V I L AVG D LED + + Δ inductance (H) resistance (Ω) rrent sense resis quired LED curre upply voltage (V) l peak-peak rippl total LED forward switch resistance ode forward volta - 2 tion (cont.) for the AL8808 alues. The induc Lower inductor v opagation delays Figure 4 d as close to the d saturation current L8807 are listed i L (µH) D ( 33 0. 68 0. 33 0. osen to maintain used as a guide, ( R r R x I SW L S + + () r R x L S G + stance (Ω) ent (A) e current (A) {Int d voltage (V) (Ω) {=0.35Ω nom age at the require w are in the range ctance used will alues can be us s) and increase p 0. Inductor Valu device as possib t higher than the in the table below DCR (V) ISAT (A) 093 2.3 213 1.5 124 1.1 n operating duty c with reference t ) W ternally set to 0.4 minal} ed load current (V 13 of 20 www.diodes.co e 33µH to 100µH depend on a c sed to increase t power dissipation ue with Input Volt ble with low resis peak output cur w: T ) 3 Co 5 1 cycle and switch o Figure 1 - Ope 4 x IAVG} V) m H. Note that the combination of In he switching freq n (due to switchin tage and Numbe stance/stray induc rrent and a contin Manufactu oilCraft www.coi NIC www.niccom 'on'/'off' times ov erating waveform Figure e AL8808 Web C nput voltage and quency and redu ng losses). er of LEDs ctance connectio nuous current rat rer lcraft.com mp.com ver the supply vo ms. e 41. Typical Swi Calculator provid d LED chain vo uce solution size ons to the SW pi ting above the oltage and load c itching Waveform January 201 © Diodes Incorporate AL8808 es performance ltage to set the e but may affect n. current range. m 3 ed |
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