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MIC2128 bảng dữ liệu(PDF) 25 Page - Microchip Technology

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MIC2128 bảng dữ liệu(HTML) 25 Page - Microchip Technology

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 2016 Microchip Technology Inc.
DS20005620A-page 25
MIC2128
EQUATION 5-33:
The maximum recommended operating junction
temperature for the MIC2128 is 125°C.
Using the output voltage of the same switching
regulator, when it is in between 4.6V (typ.) to 14V, as
the voltage at the EXTVDD pin, significantly reduces
the power dissipation inside the MIC2128. This
reduces the junction temperature rise as illustrated
below.
For the typical case of VVIN = 48V, VOUT = 5V, the
maximum ambient temperature = 85°C and 10 mA of
ISW.
The condition where EXTVDD is not used is shown in
Equation 5-34:
EQUATION 5-34:
When the 5V output is used as the input to the EXT-
VDD pin, the MIC2128 junction temperature reduces
from 113°C to 88°C as calculated in Equation 5-35:
EQUATION 5-35:
T
J
P
IC
JA
 T
A
+
=
Where:
TJ
= Junction temperature
PIC
= Power dissipation
θJA
= Junction Ambient Thermal resistance
(50.8
°C/W)
P
IC
48V
10mA
1.5
·
mA
+

=
P
IC
0.552W
=
T
J
0.552W
50.8
CW
 85
C
+
=
T
J
113
C
=
P
IC
5V10mA
1.5mA
+

=
P
IC
0.058W
=
T
J
0.058W
50.8
CW
 85
C
+
=
T
J
88
C
=



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