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AN4158 Datasheet(PDF) 27 Page - STMicroelectronics

No. de pieza AN4158
Descripción Electrónicos  Peak current control with automatic decay adjustment
PDF  34 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4158 Datasheet(HTML) 27 Page - STMicroelectronics

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AN4158
STMicroelectronics enhanced current control
34
Equation 10
Figure 23. Off-time automatic adjustment
Considering that the on-time and the predictive time at the steady-state of two subsequent
current levels is almost the same (see Figure 23), the resulting switching time tswitch is
almost equal to the target tSW value.
toff
tsw 2tpred n1
–

–
=
New steady-state
t
on(B) = t PRED(B) tPRED(A)
t
I
I
on(B)
t
pred(B)
t
on(A)
t
pred(A)
t
on(A)
t
pred(A)
t
pred(A)
t
switch(B)
t
t
t
Reference current
Current reference changed
t
= t
SW - 2 x tPRED(A)
t
switch(B) is almost equal to target switching time tSW
Steady-state
t
on(A) = t PRED(A)
AM15125v1



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