PI2125 datasheet(13/20 Pages) VICOR

13 / 20 page

Figure 18:

Plot of PI2125 response time to reverse current detection (Example 1, Figure 23)

Application Information

The PI2125 is designed to replace ORing diodes in

high

current,

low

voltage

redundant

power

architectures. Replacing a traditional diode with a

PI2125 will result in significant power dissipation

reduction as well as board space reduction,

efficiency improvement and additional protection

features.

This section describes in detail the

procedure to follow when designing with the PI2125

Active ORing solution.

Fault Indication:

The FT output pin is an open collector and should

be pulled up to the logic voltage or to the controller

VC via a resistor (10KΩ).

In a floating configuration, the FT pin is referenced

to the PI2125 GND pin which is referenced to the

input voltage, Vin. The FT output status can be

reference to the system ground by adding a level

shifting circuit, as shown in figure 19. The level shift

circuit can be designed with one small and

inexpensive off-the-shelf device, a Dual Bias

Resistor Transistor, containing NPN and PNP

transistors

with

their

bias

resistors,

NSBC114EPDXV6T1.

Figure 19: FT Level shift circuit

Picor Corporation • picorpower.com

PI2125

Rev 1.0

Page 13 of 20

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