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AN4376 bảng dữ liệu(PDF) 28 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]
Trang chủ  http://www.st.com
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AN4376 bảng dữ liệu(HTML) 28 Page - STMicroelectronics

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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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