MCWI03 SERIES
DC/DC CONVERTER 3W, SIP-Package
Total Power International, Inc.
Test Setup
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
Copper Strip
Cout
+Vin
+Out
-Out
+Vin
Dual Output
DC / DC
Converter
+Out
Com.
-Out
Scope
Scope
Single Output
DC / DC
Converter
Resistive
Load
Resistive
Load
Scope
Copper Strip
Cout
-Vin
-Vin
Copper Strip
330pF
Copper Strip
330pF
Technical Notes
Remote On/Off
Negative logic remote on/off turns the module off during a logic high voltage on the remote on/off pin, and on during a logic low. To turn the power module on and off,
the user must supply a switch to control the voltage between the on/off terminal and the -Vin terminal. The switch can be an open collector or equivalent.
A logic high is 2.7V to 15V. A logic low is under 0.6 VDC or open circuit, drops down to 0VDC by 2mV/℃. The maximum sink current at on/off terminal during a logic
low is 1 mA. The maximum allowable leakage current of the switch at on/off terminal= (under 0.6VDC or open circuit) is 1mA.
Maximum Capacitive Load
The MCWI03 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.
Overcurrent Protection
To provide protection in a fault (output overload) condition, the unit is equipped with internal current limiting circuitry and can endure current limiting for an unlimited
duration. At the point of current-limit inception, the unit shifts from voltage control to current control. The unit operates normally once the output current is brought back
into its specified range.
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 commended to use a good quality low Equivalent Series Resistance (ESR < 1.0Ω
at 100 KHz) capacitor of a 3.3µF for the 12V input devices and a 1.5µF for the 24V and 48V devices.
+
+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
Single Output
DC / DC
Converter
Load
Load
Dual Output
DC Power
Source
Cout
Cout
DC Power
Source
DC / DC Com.
Converter
Cout
Load
-
-Out
-
-Vin
-Out
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 105℃. 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 ]
