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SI-8090JD Folha de dados(PDF) 6 Page - Allegro MicroSystems

Nome de Peças SI-8090JD
Descrição Electrónicos  Step-Down to 9.0 V, 1.5 A, DC/DC Converter
Download  10 Pages
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Fabricante Electrônico  ALLEGRO [Allegro MicroSystems]
Página de início  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

SI-8090JD Folha de dados(HTML) 6 Page - Allegro MicroSystems

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SI-8090JD
Step-Down
to 9.0 V, 1.5 A,
DC/DC Converter
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036
Switching
Regulators
6
Layout Guideline
APPLICATIONS INFORMATION (cont.)
Thermal Protection. Circuitry turns off the switching
transistor when the junction temperature rises above 150°C.
It is intended only to protect the device from failures due to
excessive junction temperatures and should not imply that
output short circuits or continuous overloads are permitted.
Heat Radiation and Reliability. The reliability of the
IC is directly related to the junction temperature (T
J) in its
operation. Accordingly, careful consideration should be
given to heat dissipation.
The inner frame on which the integrated circuit is mounted
is connected to the GND terminal (pin 3). Therefore, it is
very effective for heat radiation to enlarge the copper area
that is connected to the GND terminal. The graph illus-
trates the effect of the copper area on the junction-to-
ambient thermal resistance (RθJA).
The junction temperature (T
J) can be determined from
either of the following equations:
T
J = (PDR
θJA) + TA
or
T
J = (PDR
θJC) + TC
where P
D = VIII – VOIO – VFIO(1 – [VO/VI])
or the adjacent graph,
V
F = the Schottky diode forward voltage, and
RθJC =3°C/W.


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