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SMB214B Arkusz danych(PDF) 20 Page - Summit Microelectronics, Inc.

Numer części SMB214B
Szczegółowy opis  High-power, Three-channel Programmable DC-DC System Power Managers
PDF  26 Pages
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Producent  SUMMIT [Summit Microelectronics, Inc.]
Strona internetowa  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SMB214B Arkusz danych(HTML) 20 Page - Summit Microelectronics, Inc.

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SMB214A/B/C
Summit Microelectronics, Inc
2128 2.0 6/20/2008
20
APPLICATIONS INFORMATION (CONTINUED)
The input capacitance must be chosen such that the
rise and fall times specified in the datasheet do not
exceed ~5% of the switching period.
To ensure the maximum load current will not exceed
the power rating of the FET, the power dissipation of
each FET must be determined. It is important to look
at each FET individually and then add the power
dissipation of complementary FETs after the power
dissipation over one cycle has been determined. The
Power dissipation can be approximated as follows:
Equation 3:
ON
L
DSON
T
I
R
P
*
*
~
2
Where TON is the on time of the primary switch. TON
can be calculated as follows:
Equations 4, 5:
T
V
V
PFET
Buck
T
V
V
NFET
Buck
IN
O
IN
O
*
:
*
)
1
(
:
−
−
−
Compensation:
Summit provides a design tool to called Summit Power
Designer”
that
will
automatically
calculate
the
compensation values for a design or allow the system
to be customized for a particular application. The
power
designer
software
can
be
found
at
http://www.summitmicro.com/prod_select/xls/SummitP
owerDesigner_Install.zip.



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