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GPP1V5-25 Datasheet(PDF) 7 Page - Galaxy Power, Inc.

Part # GPP1V5-25
Description  Polaris Series
Download  8 Pages
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Manufacturer  GALAXY [Galaxy Power, Inc.]
Direct Link  http://www.galaxypwr.com
Logo GALAXY - Galaxy Power, Inc.

GPP1V5-25 Datasheet(HTML) 7 Page - Galaxy Power, Inc.

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Polaris Series, Page 7
Part No. 99–003 Rev. 1.0
WWW.GALAXYPWR.COM
Application Notes
For the GPP5V0-15 and GPP5V0-20, the trim resistor,
Rtrim for these two units is:
60.50 – 5.91 * Vo
RTRIM = —————————— Kohms
VO – 5
Thermal Considerations:
Thermal considerations are an important factor in the
reliable operation of the converter. The maximum
operating baseplate temperature is 100
°C. The
maximum recommended operating baseplate
temperature is 90
°C. The baseplate temperature is a
function of the losses within the converter, the converter
ambient temperature, and airflow across the heat sink.
The reference baseplate temperature is measured at the
center coordinates of the baseplate.
The baseplate temperature can be approximated by the
following equation:
1-
η
TBASEPLATE = POUTPUT * —— * RBASEPLATE-AMBIENT + TAMBIENT
η
Where:
TBASEPLATE
is the temperature of the
baseplate.
Tambient
is the local ambient temperature
around the converter
η
is the efficiency of the converter
(see Table on page 5)
Rbaseplate-ambient is the thermal resistance from the
baseplate to the ambient
environment. This is a function
of the heat sink and air velocity.
Thermal Shutdown: The converter shall shutdown
under a thermal overload. This is a latched condition
and either the input voltage has to be recycled or the
primary enable signal (P_ENABLE_L) has to be
recycled to reset normal operation.
Overcurrent Protection: The converter shall survive
any overload condition indefinitely including short
circuit. The values of current limit and short circuit
shall be per the Output Characteristics Table.
Overvoltage Protection: The converter shall be
protected against any overvoltage across Vout pins by
shutting down the output at the values specified in the
Output Characterisitics Table. This is a latched
condition and either the input voltage has to be recycled
or the primary enable signal (P_ENABLE_L) has to be
recycled to reset normal operation.
Recommended Input Filter, Fuse and Case
Connections: A fuse is required in series with the plus
or minus side of the 48V input to meet safety
requirements. The following input filter circuit is
recommended for all applications. The fuse should be
inserted between the capacitors and the plus or minus
input of the converter. The case should be connected to
the output return.
Output
DC/DC
Converter
RLOAD
Input
+
+
P Enable
Case
In (+)
In (–)
C3
1µF
100V
C4
1µF
100V
C2
1µF
100V
C1
270µF
63V
L1
Common Mode Inductor
C1
270µF, 63V Aluminum Electrolytic Capacitor
C2-C4
1µF, 100V Ceramic capacitor
48V RTN
48V
L1
80
UH
1
2
3
4
In (+)
In (–)
°
°
+
F1


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