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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AN4460 데이터시트(PDF) 37 Page - STMicroelectronics |
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AN4460 데이터시트(HTML) 37 Page - STMicroelectronics |
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37 / 54 page  DocID026129 Rev 1 37/54 AN4460 Measurements 54 8 Measurements This section reports several measurement results validating the STEVAL-ILL057V1 demonstration board performance. 8.1 Output current precision for different current setup Figure 14 shows the current flow through the LEDs, measured with a current probe on all four channels. The operating current of all channels is the point 0 in Table 1 on page 14 (245 mA mean). Note the channel has delayed startup point and the current precision on all channels displayed. R1 is channel zero, R2 is channel two, R3 is channel three and 3 is channel four. The dimming periods, same for all channels, is ~5 ms (193 Hz). Figure 14. Current regulation - 4 channels at 245 mA Figure 15 represents the different current regulation on the same channel and at the same dimming level. The current has changed using the “lc” command using, as second parameter, the index of the expected current. The vertical grid resolution is 100 mA/div. See Table 1 on page 14 for the index and current relation. AM16714v1 |
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