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AN4214 bảng dữ liệu(PDF) 21 Page - STMicroelectronics

tên linh kiện AN4214
Giải thích chi tiết về linh kiện  High power factor flyback converter using the L6564
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN4214 bảng dữ liệu(HTML) 21 Page - STMicroelectronics

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AN4214
Short-circuit test
37
7
Short-circuit test
The short-circuit of output terminals of the converter is performed to analyze the safe
operation of the converter in case of overload and short-circuit. The test is performed at
140 Vac, 230 Vac and 265 Vac in order to observe for any malfunction or failure.
In particular the waveforms of drain switching voltage, drain current and Vcc of the device is
observed when attempting the short-circuit.
Looking into figures from 21 to 23, we can notice that there is no stress condition observed
in power as well as control stage. The L6564 enters into protection mode with very low
switching frequency of switching burst and MOSFET is well protected.
Figure 21. Output short-circuit at 140 Vac



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