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.
To Oscilloscope
+Lin+
Battery
Cin
Current
Probe
Peak-to-Peak Output Noise Measurement Test
Use a Cout 0.33uF ceramic capacitor.
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.
+Vin
Single Output
DC / DC
Converter
-Vin
+Out
-Out
Copper Strip
Cout
+Vin
DC / DC
Converter
-Vin
+Out
-Out
Scope
Load
Resistive
Load
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
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.
+Out
Load
-Out
DC Power
Source
+
Cin
+Vin
DC / DC
Converter
-Vin
+
-
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 1.0uF
capacitors at the output.
+Out
-Out
Cout
Load
DC Power
Source
+
-
+Vin
Single Output
DC / DC
Converter
-Vin
Copper Strip
+Vin
Dual Output
DC / DC
Converter
-Vin
+Out
Com.
-Out
Cout
Cout
Scope
Resistive
Load
Scope
Design & Feature Considerations
Maximum Capacitive Load
The MSAU300 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 ramp-up and the startup
time.
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.
+Out
Com.
-Out
Cout
Load
DC Power
Source
+
-
+Vin
Dual Output
DC / DC
Converter
-Vin
Thermal Considerations
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.
Position of air velocity
probe and thermocouple
15mm / 0.6in
50mm / 2in
Air Flow
DUT
REV:0 2005/04
MINMAX
4
Page 5
MSAU300 Series
Mechanical Dimensions
2.54[0.100]
2.2[0.08]
1.3
[0.05]
0.1[0.04]
1.0
12356
2.54 2.545.082.54
[0.100] [0.100]
[0.200]
15.3[0.60]
14.8[0.58]
0.6[0.023]
14.3[0.56]
[0.100]
Connecting Pin Patterns
Top View (2.54 mm / 0.1 inch grids)
78101112
8.0[0.31]
1.27
15.24
5.08
2.54
2.542.54
8
12.7
1.0
~4
1.8
2.0
[0.07]
4.7[0.18]
0.25[0.01]
6.7[0.26]
7.0[0.27]
X.XXX{0.005X.XX{0.13
8.0[0.31]
6.7[0.26]
C1.0
5.2[0.20]
7.0[0.27]
9.2[0.36]
11.2[0.44]
0
InchesMillimetersTolerance
X.XX{0.01X.X{0.25
{0.002{0.05Pin
Pin Connections
Dual OutputSingle OutputPin
-Vin-Vin1
+Vin+Vin2
NANA3
Common-Vout5
-VoutNA6
NANA7
+Vout+Vout8
Physical Characteristics
15.3*8.0*7.0 mm
:Case Size
0.60*0.31*0.27 inches
Molding
:Case Material
2.2g:Weight
UL94V-0:Flammability
NANA10
NANA11
NANA12
NA: Not Available for Electrical Connection
The MSAU300 converter is encapsulated in a low thermal resistance molding compound that has excellent resistance/electrical
characteristics over a wide temperature range or in high humidity environments.
The encapsulant and unit case are both rated to UL 94V-0 flammability specifications.
Leads are tin plated for improved solderability.
5
MINMAX
REV:0 2005/04
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