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SC667 Datasheet(PDF) 23 Page - Semtech Corporation

No. de pieza SC667
Descripción Electrónicos  7 LED Light Management Unit Automatic Dropout Prevention, Ambient Light Sense Input, PWM Dimming, and 4 LDOs
PDF  47 Pages
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Fabricante Electrónico  SEMTECH [Semtech Corporation]
Página de inicio  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC667 Datasheet(HTML) 23 Page - Semtech Corporation

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SC667
23
Applications Information (continued)
Thermal Management
A junction temperature calculation should be performed
for each new application design to ensure the device will
not exceed 125°C during normal operation. The first step
is to determine how much power can be dissipated by the
SC667 in the application. The following formula approxi-
mates the maximum dissipation. This formula can be used
to sum the maximum internal power dissipation required
of each LDO and each backlight sink.
7
1
m
BLm
BLm
4
1
n
LDOn
LDOn
IN
D
I
V
I
)
V
V
(
P
The resulting power dissipation can then be used in the
calculation for maximum junction temperature.
D
JA
A
J
P
T
T
where,
T
A = Maximum ambient temperature rating in °C.
Q
JA= Thermal resistance, from junction to ambient, equal
to 35°C/W for a optimum circuit board layout.



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