Rev A

DCMRH15 SERIES

15 Watts

Medical DC/DC Converter

Single and Dual Output

12/8/2017

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

Input Reflected-Ripple Current Test Setup

Input reflected-

ripple current is measured with an inductor Lin (4.7µH) and Cin (220µF, ESR <1.0Ω at 100KHz) to simulate source impedance. Capacitor

Cin, offsets possible battery impedance. Current ripple is measured at the input terminals of the module, measurement bandwidth is 0-500Khz.

Peak-to-Peak Output Noise Measurement Test

Use a Cout 4.7µF 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

Over Load Protection

To provide hiccup model protection in a fault (output over load) condition, the unit is equipped with internal current limiting circuitry and can endure

overload for an unlimited duration.

Over Voltage Protection

The output over voltage 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 over voltage. The OVP level can be found in data sheet.

Input Source Impedance

The power module should be connected to a low ac-impedance 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 ensure startup.

By using a good quality low Equivalent Series Resistance (ESR <1.0 at 100kHz) capacitor of 10µF for 12V input devices, a 4.7µF for 24V input devices,

and a 2.2µF for the 48V devices, capacitor mounted close to the power module helps 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.