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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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STLD20D Arkusz danych(PDF) 18 Page - STMicroelectronics |
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STLD20D Arkusz danych(HTML) 18 Page - STMicroelectronics |
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18 / 31 page  Components selection STLD20D 18/31 In fact, in boost backlighting converter, the conduction losses (Pcond) lead by the forward characteristics can be negligible compared to the losses induced by the reverse current (Prev), especially at high temperature. 7.4 RLED feedback resistance selection The average output current is regulated by sensing a low external ohmic sensing resistor RLED. Thus, a constant current value is fixed for each LED whatever the ambient temperature conditions. RLED is given by: 7.5 Efficiency Efficiency is a significant parameter for the application. The higher the efficiency, the longer the life time of the battery. The efficiency is given by: . R LED V FB I LED ----------- 0.3V 20mA ---------------- 15 Ω 7 [] = = = Efficiency P output P input ------------------- NV LED I LED ⋅ ⋅ V IN I input ⋅ -------------------------------------------- 8 [] = = |
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