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SC453 Arkusz danych(PDF) 22 Page - Semtech Corporation

Numer części SC453
Szczegółowy opis  Portable, VID Programmed Single Phase Power Supply Controller
PDF  26 Pages
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Producent  SEMTECH [Semtech Corporation]
Strona internetowa  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC453 Arkusz danych(HTML) 22 Page - Semtech Corporation

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© 2009 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC453
Applications Information (Cont.)
Three soft-start examples are based on the previous three
conditions for SC453 application.
1. Start-Up
ISS
6.5
μA
:=
dtSU
3m s
:=
dVdacSU
VMAX_NL
:=
CSS_max_startup
ISS dtSU
⋅
dVdacSU
:=
CSS_max_startup
1.609
10
8
−
×
F
=
2. VID Change:
ISSV
120
μA
:=
dtV
100
μs
:=
dVdacV
VMAX_NL VMIN_NL
−
:=
CSS_max_VID
ISSV dtV
⋅
dVdacV
:=
CSS_max_VID
4.687
10
8
−
×
F
=
3. Sleep Entry/Exit:
ISSS
240
μA
:=
dtS
33
μs
:=
dVdacS
VMAX_NL VSLP
−
:=
CSS_max_drs
ISSS dtS
⋅
dVdacS
:=
CSS_max_drs
1.714
10
8
−
×
F
=
Example 1 predicts the maximum capacitance allowed.
In order to allow tolerance C22 = 15nF is chosen.



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