DSAU105 Delta Electronics, Inc., DSAU105 Datasheet - Page 4

• Manufacturer Part Number: DSAU105
• Description: Delphi Dsau100 Series Dc/dc Power Modules 5, 12, 24vin, 1w Smd
• Manufacturer: Delta Electronics, Inc.

Design & Feature Considerations
The DSAU100 circuit block diagrams are shown in
Figure 3
Peak-to-Peak Output Noise Measurement
Scope measurement should be made by using a BNC
socket, measurement bandwidth is 0-20 MHz. Position
the load between 50 mm and 75 mm from the DC/DC
Converter. A Cout of 0.33uF ceramic capacitor is
placed between the terminals shown below.
Input Source Impedance
The power module should be connected to a low ac-
impedance input source. Highly inductive source
impedances can affect the stability of the power
module.
In applications where power is supplied over long lines
and output loading is high, it may be necessary to use
a capacitor at the input to ensure startup.
Capacitor mounted close to the input of the power
module helps ensure stability of the unit, it is
recommended to use a good quality low Equivalent
Series Resistance (ESR < 1.0Ω at 100 KHz) capacitor
of a 2.2uF for the 5V input devices, a 1.0uF for the 12V
input devices, and a 0.47uF for the 24V devices.
+Vin
-Vin
DC Power
Single Output
Source
Converter
DC / DC
+
-
+Out
-Out
+
Cin
Copper Strip
+Vin
-Vin
Cout
Converter
DC / DC
Scope
+Out
-Out
Resistive
Load
Load
Maximum Capacitive Load
The DSAU100 series has limitation of maximum connected
capacitance at the output. The power module may be
operated in current limiting mode during start-up, affecting
the
performance we recommend 33uF maximum capacitive
load for single outputs.
Output Ripple Reduction
A good quality low ESR capacitor placed as close as
practicable across the load will give the best ripple and
noise performance.
To reduce output ripple, it is recommended to use 0.47uF
capacitors at the output.
Soldering and Cleaning Considerations
Post solder cleaning is usually the final board assembly
process before the board or system undergoes electrical
testing. Inadequate cleaning and/or drying may lower the
reliability of a power module and severely affect the
finished circuit board assembly test. Adequate cleaning
and/or drying is especially important for un-encapsulated
and/or open frame type power modules. For assistance
on appropriate soldering and cleaning procedures,
please contact Delta’s technical support team.
DC Power
Source
ramp-up
+
-
and
+Vin
-Vin
Single Output
the
Converter
DC / DC
startup
+Out
-Out
time.
Cout
Load
For
optimum
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