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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) 33 Page - STMicroelectronics |
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UM0670 датащи(HTML) 33 Page - STMicroelectronics |
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33 / 43 page  Design features UM0670 33/43 Doc ID 15327 Rev 2 Figure 40. Proper startup using diode D104 and capacitor C110 Figure 41. Improper startup without using diode D104 and capacitor C110 10.2 Zero dimming design implementation During zero dimming (duty cycle is 0%) the high PF boost converter is in burst mode because there is zero load. During this mode, capacitors C107 and C110 are charged only in short pulses (C107 is also slightly charged via resistor from the input voltage, but it is not enough) and therefore do not have enough energy to also supply the PWM generator and the second L6562A controller used for the modified buck converter. The circuit shown in Figure 42 allows brightness changes down to 0% without any problem, because if the |
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