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EM5301F Arkusz danych(PDF) 11 Page - Excelliance MOS Corp.

Numer części EM5301F
Szczegółowy opis  12V Synchronous Buck PWM Controller
PDF  12 Pages
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Producent  EXCELLIANCE [Excelliance MOS Corp.]
Strona internetowa  http://www.excelliancemos.com/
Logo EXCELLIANCE - Excelliance MOS Corp.

EM5301F Arkusz danych(HTML) 11 Page - Excelliance MOS Corp.

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2013/5/2
Rev.A.1
11
EM5301F/G
Power MOSFET Selection
The EM5301F/G requires two N-Channel power
MOSFETs. These should be selected based upon
on-resistance, breakdown voltage, gate supply
requirement,
and
thermal
management
requirements.
In high current applications, the MOSFET power
dissipation, package selection and heat sink are the
dominate design factor. The power dissipation
includes two loss components: conduction loss and
switching loss. The conduction losses are the
largest component of power dissipation for both
the upper and lower MOSFETs. These losses are
distributed between the two MOSFETs according
to duty factor.
The power dissipations in the two MOSFETs are
approximately the following equation:
SW
SW
IN
OUT
DS(ON)
OUT
2
UPPER
t
F
V
I
D
*
R
*
I
PD
*
*
*
*
5
.
0
+
=
D)
-
(1
*
R
*
I
PD
DS(ON)
OUT
2
LOWER
=
Where D is the duty cycle, tSW is the combined
switch ON and OFF time.



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