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AN4165 датащи(PDF) 22 Page - STMicroelectronics

номер детали AN4165
подробное описание детали  This document describes a 12 V - 1 A power supply set in non-isolated flyback topology
PDF  37 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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AN4165 датащи(HTML) 22 Page - STMicroelectronics

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AN4165
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Doc ID 023661 Rev 1
10.3
Feedback loop failure protection
When the loop is broken (R4 = R4a + R4b shorted or R3 open), the output voltage VOUT
increases and the VIPER26 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.
If the VDD voltage reaches the VDDclamp threshold (23.5 V min.) in less than 50 msec, the IC
is shut down by the open loop failure protection (see
Figure 30 and 31), otherwise by OLP,
as described in the previous section. The breaking of the loop has been simulated by
Figure 26.
Output short-circuit applied:
OLP tripping
Figure 27.
Output short-circuit maintained:
OLP steady-state
Figure 28.
Output short-circuit maintained:
OLP steady-state, zoom
Figure 29.
Output short-circuit removal and
converter restart
AM11574v1
Output is shorted here
Normal
operation
AM11575v1
tRESTART
AM13381v1
tOVL
tSS
tOVL
tSS
AM11577v1
Output short is
removed here
tRESTART
Normal
operation



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