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AN4376 bảng dữ liệu(PDF) 27 Page - STMicroelectronics

tên linh kiện AN4376
Giải thích chi tiết về linh kiện  10 W wide range non-isolated high power factor LED driver using HVLED815PF
PDF  37 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN4376 bảng dữ liệu(HTML) 27 Page - STMicroelectronics

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AN4376
PFC waveforms
37
7.5
OVP protection and no load behavior
During a load disconnection the HVLED815PF device senses the output voltage through the
DMG pin and controls the voltage loop in order to regulate the output capacitor voltage to
a level below its maximum rating (100 V) (see the HVLED815PF datasheet [1. in Section 8:
Supporting material on page 36]).
As shown in Figure 35 and Figure 37 the converter works in a burst mode during no load
condition. No current is flowing into the LED load.
Figure 34. Load disconnection
at 100 VAC - 50 Hz
Figure 35. No load behavior
at 100 VAC - 50 Hz
CH1: DRAIN
CH2: IOUT
CH3: VOUT
CH4: DMG
CH1: DRAIN
CH2: IOUT
CH3: VOUT
CH4: DMG
Figure 36. Load disconnection
at 230 VAC - 50 Hz
Figure 37. No load behavior
at 230 VAC - 50 Hz
CH1: DRAIN
CH2: IOUT
CH3: VOUT
CH4: DMG
CH1: DRAIN
CH2: IOUT
CH3: VOUT
CH4: DMG



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