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AN4165 数据表(PDF) 23 Page - STMicroelectronics

部件名 AN4165
功能描述  This document describes a 12 V - 1 A power supply set in non-isolated flyback topology
PDF  37 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

AN4165 数据表(HTML) 23 Page - STMicroelectronics

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AN4165
Functional check
Doc ID 023661 Rev 1
23/37
shorting the low-side resistor of the output voltage divider, R4 = R4a + R4b. The same
behavior can be caused by opening the high-side resistor, R3.
The protection acts in auto-restart mode with tRESTART = 1 s (Figure 31). When the fault is
removed, normal operation is restored after the last tRESTART interval has been completed
(
Figure 33).
Figure 30.
Feedback loop failure protection:
tripping
Figure 31.
Feedback loop failure protection:
steady-state
AM11578v1
Normal
operation
< tOVL
Fault is applied here
VDD reaches VDDCLAMP
AM11579v1
tRESTART
Figure 32.
Feedback loop failure protection:
steady-state, zoom
Figure 33.
Feedback loop failure removal:
converter restart
AM11580v1
< tOVL
AM11581v1
tRESTART
Fault is removed here
Normal
operation



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