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AN4116 датащи(PDF) 22 Page - STMicroelectronics

номер детали AN4116
подробное описание детали  This document describes a 12 V-350 mA power supply
PDF  38 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4116 датащи(HTML) 22 Page - STMicroelectronics

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Doc ID 023220 Rev 1
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 VDD clamp 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.
Output 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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