Rev A

DCMFW03 SERIES

3 Watts

DC/DC Converter

Single and Dual Output

2/3/2017

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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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 0-20MHz. Position the

load between 50mm and 75mm from the DC/DC converter.

TECHNICAL NOTES

Maximum Capcitive Load

The DCMFW03 series has limitation of maximum connected capacitance at the output. The power module many be operated in current lmiting mode

during start-up, affecting the ramp-up and the startup time. The maximum capacitance can be found in the data sheet.

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. 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 capactior at the input to ensure

startup. Capacitor moutned close to the power module helps ensure stabiliyt of the unit, it is recommended to use a good quality low Equivalent Series

Resistance (ESR <1.0

Ω at 100KHz) capactior of a 8.2µF for the 5V input device, a 3.3µF for the 12V input devices and a 1.5µF for the 24V and 48V

devices.

Output Ripple Reduction

A good quality low ESR capacitor placed as close as practivable 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.

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 temeprature must be kept below 105ºC. the derating

curves are determined from mesuarements obtained in a test setup.