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AN2929 bảng dữ liệu(PDF) 23 Page - STMicroelectronics

tên linh kiện AN2929
Giải thích chi tiết về linh kiện  In consumer applications such as LCD or plasma TVs
PDF  32 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2929 bảng dữ liệu(HTML) 23 Page - STMicroelectronics

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AN2929
Testing the board
Doc ID 15333 Rev 2
23/32
Figure 23.
2nd OCP tripping
In Figure 23 when the board was working in full-load condition with an input voltage of
115 VAC, the secondary winding was shorted. The short on the secondary winding leads to
a high drain current. After two switching cycles, the system stops and continuous running
with high currents in the primary as well as in the secondary windings and through the
power section of the VIPER27LN is avoided. Figure 24 shows the situation when a
permanent short-circuit is applied on the secondary windings. Most of the time the power
section of the VIPER27LN is off, eliminating any risk of overheating.
Figure 24.
Operating with secondary winding shorted - restart mode
Ch1 = VOUT
Ch2 = VFB
Ch4 = IDRAIN
Test condition:
Vin = 230VAC
Full load before
short
Ch3 = VDD
Ch4 = IDRAIN
Test condition
Vin=230VAC
Secondary winding
shorted



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