MKW10M SERIES
Total Power International, Inc.
DC/DC CONVERTER 10W, Reinforced Insulation, Medical Safety
Test Setup
Input Reflected-Ripple Current Test Setup
Input reflected-ripple current is measured with a inductor Lin (4.7µH) and Cin (220µF, ESR < 1.0Ω 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
+Vin
+Out
+
+
Lin
DC / DC
Converter
Current
Probe
Load
Battery
Cin
-Vin
-Out
Peak-to-Peak Output Noise Measurement Test
Use a Cout 0.47µF 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.
Copper Strip
Cout
+Vin
+Out
Copper Strip
+Vin
+Out
Com.
-Out
Scope
Scope
Single Output
DC / DC
Converter
Dual Output
DC / DC
Converter
Resistive
Load
Resistive
Load
Cout
Scope
Copper Strip
Cout
-Vin
-Out
Copper Strip
-Vin
Copper Strip
Technical Notes
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 on the input to insure startup. By using a
good quality low Equivalent Series Resistance (ESR < 1.0Ω at 100 kHz) capacitor of a 10µF for the 12V input devices and a 4.7µF for the 24V input devices and a
2.2µF for the 48V devices, capacitor mounted close to the power module helps ensure stability of the unit.
+
+Vin
+Out
+
DC / DC
Converter
DC Power
Source
Load
Cin
-
-Vin
-Out
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 3.3µF capacitors at the output.
+
+Vin
-Vin
+Out
+
+Vin
+Out
Com.
-Out
Single Output
DC / DC
Converter
Load
Load
Dual Output
DC / DC
Converter
DC Power
Source
Cout
Cout
DC Power
Source
Cout
Load
-
-Out
-
-Vin
Maximum Capacitive Load
The MKW10M series has limitation of maximum connected capacitance on the output. The power module may operate in current limiting mode during start-up,
affecting the ramp-up and the startup time. Connect capacitors at the point of load for best performance. The maximum capacitance can be found in the data
sheet.
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 95℃. The derating curves are determined
from measurements obtained in a test setup.
Position of air velocity
probe and thermocouple
Air Flow
50mm / 2in
15mm / 0.6in
DUT
Total Power International, Inc
Toll Free: 877-646-0900
www.total-power.com
TOTAL-POWER [ TOTAL POWER INTERNATIONAL ]
