Rev B

DCMIE03-HI SERIES

3 Watts

DC/DC Converter

Single and Dual Outputs

1/9/2018

Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 •

Fax 603-778-9797

website: www.wallindustries.com • e-mail: sales@wallindustries.com

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TECHNICAL NOTES

Overload 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.

Overvoltage Protection

The output overvoltage clamp consists of control circuitry, which is independent of the primary regulation loop that monitors the voltage on

the output terminals. The control loop of the clamp has a higher voltage set point than the primary loop. This provides a redundant voltage

control that reduces the risk of output overvoltage.

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. 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<1.0Ω at 100kHz) capacitor of a 22µF for the 5V input

devices, a 10µF for the 12V input devices, a 4.7µF for the 24V input devices, and 2.2µF for the 48V devices; capacitor should be

mounted close to the power module to ensure stability of the unit.

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 4.7µF capacitors at the output.

Maximum Capacitive Load

The DCMIE03-HI 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 105ºC. The derating curves are determined from measurements obtained in a test setup.