Wall Industries, Inc.

Advanced Publication

LV200 SERIES

200 Watt Half-Brick DC/DC Power Converters

07/11/2013

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

Page 10 of 12

TEST SETUP

Regulation and Efficiency Setup

To ensure that accurate measurements are taken, the voltage measurements are taken directly at the terminal of the

module. This minimizes errors due to contact and trace lengths between the load and the output of the supply. The

following is a diagram of the test setup.

Regulation and Efficiency Probe Setup

R

R

trace

contact

R

R

contact

trace

R

R

trace

contact

R

R

contact

trace

+V

+V

in

out

-V

-V

in

out

V

V

in

out

Output Ripple Voltage Setup

The module is tested with a 1µF ceramic capacitor in parallel with a 10µF tantalum capacitor across the output terminals.

Ripple Voltage Probe Setup

LV200 SERIES

10µF

Tantalum

1µF

Ceramic

SCOPE

PROBE

Input Reflected Ripple Current & Input Ripple Current Setup

The module is tested for input reflected ripple current (Irrc) and input ripple current (Irc). The input ripple voltage is also

measured at the pins with the following input filter. If there is a need to reduce input ripple current/voltage then

additional ceramic capacitors can be added to the input of the converter.

Ripple Current Setup

12µH

Irrc

Irc

out

out

LV200 SERIES

SCOPE

PROBE

Low

Impedance

Source

6800µF

electrolytic

capacitor

1µF

ceramic

capacitor