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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4376 датащи(PDF) 28 Page - STMicroelectronics |
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AN4376 датащи(HTML) 28 Page - STMicroelectronics |
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28 / 37 page  PFC waveforms AN4376 28/37 DocID025380 Rev 1 7.6 Short-circuit and output current limitation During a short-circuit of the output connector, all the energy stored in the output electrolytic capacitor is discharged into the output side loop, so that no current will flow to the external LED, thus preventing their failure. When the output capacitor is shorted, the HVLED815PF device works with the internal self- supply function because no charging current came from the auxiliary winding. The controller doesn't stop switching but reduces the on-time to its minimum level. The selection of the R24 and R24 allows limiting the output diode current at a level of about 260 mA. Increasing Figure 38. Short-circuit of the output connector at 100 VAC - 50 Hz Figure 39. Short-circuit removal at 100 VAC - 50 Hz CH1: output LED driver current CH2: DMG CH3: VOUT CH4: VCC CH1: output LED driver current CH2: DMG CH3:V OUT CH4:V CC Figure 40. Short-circuit of the output connector at 230 VAC - 50 Hz Figure 41. Short-circuit removal at 230 VAC - 50 Hz CH1: output LED driver current CH2: DMG CH3: VOUT CH4: VCC CH1: output LED driver current CH2: DMG CH3: VOUT CH4: VCC |
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