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SM8135AB датащи(PDF) 11 Page - Nippon Precision Circuits Inc |
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SM8135AB датащи(HTML) 11 Page - Nippon Precision Circuits Inc |
11 / 20 page SM8135A SEIKO NPC CORPORATION —11 Mode Reset Function VF increases immediately after the LED current starts to flow, and then decreases as the LED temperature increases due to the heating effect of the current flow. It can take about 10 seconds for the LED temperature to stabilize and for VF to reach equilibrium, and VF may fluctuate more than 200mV. The VF fluctuation is affected by the ambient temperature and LED current setting, and has a large affect on the automatic mode switching voltage tolerances. To counter the effects of VF fluctuation, the SM8135A outputs a mode reset sig- nal once every 1.0 seconds which automatically switches the output mode to ×1.0, and then a determination is made whether to make the ×1.0 → ×1.5 mode switch. (1) Mode reset signal is output once every 1.0 seconds. (2) Mode switches from ×1.5 to ×1.0 mode on the rising edge of the mode reset signal. (3) A 200 µs (max) mode hold time begins after switching to ×1.0 mode. LED drive current insufficient state is detected but the mode is not switched during this interval. (4) LED drive current insufficient signal is ignored during the mode hold time, but normal mode switching operation resumes when the mode hold time elapses. Switching from ×1.5 mode to ×1.0 mode due to mode reset signal Mode hold L: hold VOUT output voltage ILED detector Mode reset 1.0sec/cycle 1.0 mode min 80 µs max 200 µs ILED detector ignore 4.9V VOUT mode (1) (2) (3) (4) 1.5 mode 1.5 mode |
Аналогичный номер детали - SM8135AB |
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Аналогичное описание - SM8135AB |
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