Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833

603-778-2300 www.wallindustries.com Fax 603-778-9797

ME Series

5600VDC I/O Isolation

Single and Dual Outputs

5~6 Watt Medical DC/DC Converter

Rev B

DESIGN & FEATURE CONSIDERATONS

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. A 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 < 1.0

Ω at 100KHz)

capacitor of 10

μF for the 12V input models, 4.7μF for the 24V input models, and a 2.2μF for the 48V input models.

+

+Out

-Out

+Vin

-Vin

DC / DC

Converter

Load

DC Power

Source

+

-

Cin

Maximum Capacitive Load

The ME Series has a limit of connected capacitance at the output. The power module may operate in current limiting mode

during start-up, which affects the ramp-up and the startup time. Connect capacitors at the point of load for best performance.

The maximum capacitive load can be found in the “Output Voltage / Current Rating Chart” on page 2.

TEST CONFIGURATIONS

Input Reflected-Ripple Current Test Setup

Input reflected-ripple current is measured with an inductor Lin (4.7

μH) and Cin (220μF, ESR < 1.0Ω at 100KHz) to simulate

source impedance.

+Out

-Out

+Vin

-Vin

DC / DC

Converter

Load

Battery

+

Lin

+

Cin

To Oscilloscope

Current

Probe

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 0.47

μF 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.

+Out

-Out

+Vin

-Vin

Single Output

DC / DC

Converter

Resistive

Load

Scope

Copper Strip

Cout

+Out

-Out

+Vin

-Vin

Dual Output

DC / DC

Converter

Resistive

Load

Scope

Copper Strip

Cout

Com.

Scope

Cout