PI2123 datasheet(13/20 Pages) VICOR

13 / 20 page

Picor Corporation • picorpower.com

PI2123

Rev 1.0

Page 13 of 20

Figure 18:

Plot of PI2123 response time to reverse current detection

Application Information

The PI2123 is designed to replace ORing diodes in

high

current,

low

voltage

redundant

power

architectures. Replacing a traditional diode with a

PI2123 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 PI2123

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)

Blanking Timer:

Connect the blanking timer pin (BK) to GND to

program the device for the fastest reverse

comparator response time of 160ns typical.

increase the blanking time, connect the BK pin to

GND via a resistor to avoid the fault response to

short reverse current pulses. Refer to the plot in the

reverse

comparator

functional

description

for

resistor values versus the reverse blanking time.

Auxiliary Power Supply (Vaux):

Vaux is an independent power source required to

supply power to the VC input. The Vaux voltage

should be 6V higher than Vin (redundant power

source output voltage) to fully enhance the internal

MOSFET.

A bias resistor (Rbias) is required if Vaux is higher

than 15V. Rbias should be connected between the

VC pin and Vaux.

Minimize the resistor value for low Vaux voltage

levels to avoid a voltage drop that may reduce the

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