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SC453 Arkusz danych(PDF) 21 Page - Semtech Corporation

Numer części SC453
Szczegółowy opis  Portable, VID Programmed Single Phase Power Supply Controller
PDF  23 Pages
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Producent  SEMTECH [Semtech Corporation]
Strona internetowa  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC453 Arkusz danych(HTML) 21 Page - Semtech Corporation

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© 2006 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC453
Applications Information (Cont.)
1. Start-Up:
ISS 6.5 μA
:=
dtSU 3ms
:=
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
=
Exercise #1 predicts the max capacitance allowed. In
order to allow tolerance, we choose C22 = 15nF.



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