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LED6000 数据表(PDF) 18 Page - STMicroelectronics |
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LED6000 数据表(HTML) 18 Page - STMicroelectronics |
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18 / 49 page  Functional description LED6000 18/49 DocID027777 Rev 2 In Figure 11 a very short DIM pulse is shown, measured in the standard demonstration board, VIN = 44 V, 12 LEDs. The programmed LED current, 1 A, is reached at the end of the DIM pulse (35 µs). Figure 11. Dimming operation - short DIM pulse The above consideration is crucial when short DIM pulses are expected in the final application. Once the external power components and the compensation network are selected, a direct measurement to determine tRISE and tFALL is necessary to certify the achieved dimming performance. When the DIM is forced above the VDIMH threshold after TDIMTO has elapsed, a new soft- start sequence is performed. |
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