UG:104

vicorpower.com

Applications Engineering: 800 927.9474

Page 4

Paralleling

The paralleling and current sharing capability of the devices can be demonstrated by

stacking multiple Customer Evaluation Boards and interconnecting the inputs and

outputs with standoffs of sufficient current handling capability to create a 3-dimensional

array. See Figure 3 below. When paralleling IBCs the EN control header (J11) should not

be used. The modules should be enabled with the S10 switch. Pre-enabling all modules

before input power is applied does not guarantee a synchronous startup. Therefore, the

load at startup must be sized so that any one module is able to successfully startup into

that load alone.

Input Current Measurement

A current probe can be passed around the +in lead connected to the IBC. Input

capacitors on the Customer Evaluation Board are downstream of this

measurement point.

Efficiency Measurement

As the IBC can deliver and consume large currents, the effect of the PCB must be

considered when making an efficiency measurement. Be certain to accurately measure

the voltage directly at the IBC using the appropriate pair of contact points located at the

corners of the IBC.

Figure 3.

Paralleling connections

of two IBC Customer

Evaluation Boards

+IN

+OUT

–IN

–OUT