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AN4460 датащи(PDF) 20 Page - STMicroelectronics

номер детали AN4460
подробное описание детали  The STEVAL-ILL057V1 demonstration board is a complete
PDF  54 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4460 датащи(HTML) 20 Page - STMicroelectronics

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SMED implementation
AN4460
20/54
DocID026129 Rev 1
4.4
SMED state time evolution
Figure 6 describes the SMED state time evolution. Only one PWM period is illustrated.
Figure 6. SMED state evolution. Timing
The colors identify the case of a correct or incorrect situation:
The black trace is the output current observed during a correct setup where the SMED
evolution is triggered by timer events only. In this case, no event_Seq or event_Jmp
are received; note that S2 may not have reached the peak level during S(2).
The blue trace represents the situation where the current reaches the limit point
(event_Seq) during S(2).
The red line shows the SMED evolution when an OCP event (event_Jmp) is detected
during S1. The SMED is programmed to generate an interrupt when an OCV condition
happens. The main program receives the interrupt and stops the SMED.
STATE
IDLE
S(0)
PWM
time
Current
S(1)
S(2)
S(0)
Fault zone
Current limit
off time
Fixed-
33% TON
132%
TON +20%
Current limit
Fault OCP
OK
OK
S(4)
off time
Fixed-
AM16706v1



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