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AL8808 Datasheet(PDF) 18 Page - Diodes Incorporated |
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AL8808 Datasheet(HTML) 18 Page - Diodes Incorporated |
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18 / 20 page  AL8808 Document number Applicatio Fault Conditio The AL8808 has VIN and the SW If the LEDs shou the expected cu dramatically and LEDs. The on-time of t inductor. The off 32) causing a m High Tempera The AL8808 is a temperature in temperatures an AL8808 off. This The OTP shutdo never switch-off junction tempera r: DS35648 Rev. 2 on Informat on Operation s by default open pin will then fall uld become shor urrent - so no e d the switching f the internal pow f-time is significa uch slower deca ature Operatio a high efficiency excess of 100° nd hence junctio s will allow the ju own junction tem with a junction t ature of the AL88 - 2 tion (cont.) n LED protection to GND. No exce rted together the excessive heat w requency will mo er MOSFET swi antly increased b ay in inductor cur Figure 45. Sw on and Protec switching LED d C given the co on temperature t nction temperatu mperature of the temperature belo 808. w n. If the LEDs sh essive voltages w AL8808 will con will be generated ost likely decrea itch is significant ecause the reve rrent. witching Charac tion river capable of orrect thermal im then the Over-Te ure of the AL880 e AL8808 is app ow +125°C allow 18 of 20 www.diodes.co hould become op will be seen by th ntinue to switch a d within the AL8 se. See Figure 4 tly reduced beca rse voltage acros cteristics (norma operating junctio mpedance to fre emperature Prot 8 to cool down a roximately +145 wing the designe m pen circuit the AL he AL8808. and the current t 8808. However, 45 for an examp ause almost all o ss the inductor is al open to short on temperatures ee air. If a fault tection (OTP) of and potentially giv °C with a hyster r to design the s L8808 will stop o hrough the AL88 the duty cycle ple of this behav of the input volta s now just the Sc t LED chain) up to +125°C. T should occur t f the AL8808 wil ving an opportun resis of +10°C. system thermally oscillating; the SE 808’s internal sw at which it oper ior at 24V input age is now deve chottky diode vol his allows it ope that leads to inc ll cut in turning t nity for the fault to This means that to fully utilize th January 201 © Diodes Incorporate AL8808 ET pin will rise to witch will still be a rates will change voltage driving 3 eloped across the ltage (See Figure rate with ambien creased ambien the output of the o clear itself. t the AL8808 wi he wide operating 3 ed o at e 3 e e nt nt e ll g |
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