MSAU200 Series
KHz) capacitor of 2.2uF for the 5V input devices, and a 1.0uF
for the 12V devices.
Test Configurations
Input Reflected-Ripple Current Test Setup
Input reflected-ripple current is measured with a inductor
Lin (4.7uH) and Cin (220uF, ESR < 1.0[ at 100 KHz) to
simulate source impedance.
Capacitor Cin, offsets possible battery impedance.
Current ripple is measured at the input terminals of the
module, measurement bandwidth is 0-500 KHz.
+
+Vin
DC / DC
+Out
-Out
+
DC Power
Source
Load
Converter
Cin
-
-Vin
To Oscilloscope
+Vin
+Out
Output Ripple Reduction
+
+
Lin
DC / DC
Converter
Current
Probe
Load
A good quality low ESR capacitor placed as close as
practicable across the load will give the best ripple and noise
performance.
Battery
Cin
-Vin
-Out
To reduce output ripple, it is recommended to use 0.47uF
capacitors at the output.
Peak-to-Peak Output Noise Measurement Test
+
+Vin
+Out
Use a Cout 0.33uF ceramic capacitor.
Dual Output
Cout
Load
DC Power
Source
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.
DC / DC Com.
Converter
-
-Vin
-Out
Copper Strip
Cout
+Vin
+Out
Com.
-Out
Scope
Scope
Dual Output
DC / DC
Resistive
Load
Thermal Considerations
Converter
Cout
Many conditions affect the thermal performance of the
power module, such as orientation, airflow over the module
and board spacing. To avoid exceeding the maximum
temperature rating of the components inside the power
module, the case temperature must be kept below 90°C.
The derating curves are determined from measurements
obtained in an experimental apparatus.
-Vin
Design & Feature Considerations
Maximum Capacitive Load
The MSAU200 series has limitation of maximum
connected capacitance at the output.
Position of air velocity
Air Flow
50mm / 2in
probe and thermocouple
The power module may be operated in current limiting
mode during start-up, affecting the ramp-up and the startup
time.
15mm / 0.6in
DUT
For optimum performance we recommend 33uF maximum
capacitive load.
The maximum capacitance can be found in the data sheet.
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 power module helps
ensure stability of the unit, it is recommended to use a good
quality low Equivalent Series Resistance (ESR < 1.0[ at 100
REV:0 2005/04
MINMAX
5
MINMAX [ MINMAX TECHNOLOGY CO., LTD. ]
