Page 1MB120 Application Note v0719 Copyright © 2019 SL Power Electronics Corp. All rights reserved.

MB120 Family

Internal Power Supplies

Medical Applications

AN-P019

Internal Power Supplies

For Medical Applications

MB120 Family

MB120 Application Note v0719

MB120 is a single output AC/DC power supply designed to fit into the 1U chassis. 1U is a rack unit or unit of measure defined as 1.752

inches (44.50mm). This unit of measure is most frequently used to define the overall height of 19-inch and 23-inch rack frames, as

well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed as multiples

of rack units. While designing a system with a power supply the engineer must consider the heat dissipations from integrated compo-

nents and ensure enough clearance between the parts. The small dimensions of MB120 2” x 4” x 1.25” (50.8mm x 101.6mm x 31.8mm)

allow easily to integrate it into the 1U chassis with enough space for airflow or convection cooling from top and bottom surfaces.

Power vs. Temperature

The MB120 series power supplies are capable to provide up to 120 Watt power under 200 LFM air flow. However, at some applications

cooling fans are not allowed due to higher IP ratings or where audible noise is a concern. In these systems the MB120 series still allows

highly efficient, the MB120 product family can easily fit in a 1U chassis and provides 100 Watts of convection cooled power. Input &

output and internal temperature monitoring/alarms are features of the MB120 family. All models are CE marked to low voltage directive

and approved to AAMI ES/CSA C22.2 No./EN/IEC60601-1 3

release of the new IEC 60601-1-2 4

compliant.

This application note will explain the features, benefits, and considerations while using MB120 in medical devices or systems with