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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) 19 Page - STMicroelectronics |
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UM0670 датащи(HTML) 19 Page - STMicroelectronics |
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19 / 43 page  Measurement UM0670 19/43 Doc ID 15327 Rev 2 9 Measurement 9.1 Output waveform measurement Figure 13 shows the output LED current waveform. The LED current was set to 350 mA and, as shown, the current ripple is 92 mA and the switching frequency for the modified buck converter is 125 kHz. The input voltage was 230 VAC and 12 LEDs were used as the load (OSTAR LED LE UW E3B; see Section 11: References and related materials 6). The output LED current slightly varies with the output voltage, as explained in detail in application note AN2928, (Section 11: References and related materials 2) and therefore this design is optimal for a fixed number of LEDs. The output LED current accuracy for different LED voltages is demonstrated in Figure 14. Figure 13. Output LED current waveform (ILED = 350 mA) |
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