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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UM0670 датащи(PDF) 22 Page - STMicroelectronics |
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UM0670 датащи(HTML) 22 Page - STMicroelectronics |
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22 / 43 page  UM0670 Measurement Doc ID 15327 Rev 2 22/43 Figure 18. Output LED current for different LED voltage (ILED = 1000 mA) 9.2 Power MOSFET turn ON and OFF time The power MOSFET turn ON and OFF time is shown in Figure 19. Turn ON time is approximately 50 ns and turn OFF time is approximately 120 ns (OFF time is used in Equation 13 in the appendix). Figure 19. Power MOSFET turn ON and OFF measurement 9.3 LED current ripple reduction The output LED current ripple can be reduced by increasing the output capacitor size. For example, inductor current ripple is 400 mA for the 100 nF / 450 V output capacitor, as shown in Figure 20. Thanks to the larger 470 nF capacitor used on the STEVAL-ILL013V1, the VLED v s. ILED for nominal LED current 1 A 0 200 400 600 800 1000 1200 63 84 103 122 LED voltage [V] LED current [mA] 1 A AM00405 |
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