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AN4164 bảng dữ liệu(PDF) 21 Page - STMicroelectronics

tên linh kiện AN4164
Giải thích chi tiết về linh kiện  This document describes a 12 V-350 mA power supply set in non-isolated flyback topology
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN4164 bảng dữ liệu(HTML) 21 Page - STMicroelectronics

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AN4164
Functional check
Doc ID 023660 Rev 1
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6.3
Feedback loop failure protection
This protection is available any time the IC is not self-biased. As the loop is broken (RfbL
shorted or RfbH open), the output voltage VOUT increases and the VIPER06 runs at its
maximum current limitation. The VDD pin voltage increases as well, because it is linked to
the VOUT voltage either directly or through the auxiliary winding, depending on the cases.
If the VDD voltage reaches the VDDclamp threshold (23.5 V min.) in less than 50 msec, the IC
is shut down by open loop failure protection (see
Figure 34 and 35), otherwise by OLP, as
described in the previous section. The breaking of the loop has been simulated by shorting
the low-side resistor of the output voltage divider, RfbL = RfbL1+RfbL2. The same behavior
can be induced opening the high-side resistor, RfbH = RfbH1+RfbH2.
Figure 30.
OLP short-circuit applied: OLP
tripping
Figure 31.
Output short-circuit maintained:
OLP steady-state
AM13096v1
Normal
operation
Output is shorted here
AM13097v1
tRESTART
Figure 32.
Output short-circuit maintained:
OLP steady-state (zoom)
Figure 33.
Output short-circuit removal and
converter restart
AM13098v1
tRESTART
tOVL
tSS
AM13099v1
Output short is
removed here
tRESTART
Normal
operation



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