PI2127 datasheet(10/19 Pages) VICOR

10 / 19 page



Picor Corporation • picorpower.com

PI2127

Rev 1.3

Page 10 of 19

Figure 19: Plot of PI2127 response time to reverse current detection

Application Information

The PI2127 is designed to replace high side ORing

diodes in high current, medium voltage redundant

power architectures.

Replacing a traditional diode

with a PI2127 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 PI2127 Active ORing

solution.

Control Circuitry Bias:

The PI2127 control circuitry and the gate driver for the

internal MOSFET are biased through the S pin. An

internal regulator clamps the S pin voltage (VS-PG) to

11.7V typically.

A bias resistor (RPG) is required if the voltage at the S

pin is higher than the minimum Voltage Clamp (VS-

CLM). RPG should be connected between PG pin and

ground (VS return).

Minimize the resistor value for low S voltage levels to

avoid a voltage drop that may reduce VS-PG lower than

required.

Select the value of RPG using the following equations:

PGMax

max

min

−

RPG maximum power dissipation:

PGMin

RPG

max

)

(

−

Where:

min

−

S pin minimum applied voltage

max

−

S pin maximum applied voltage

PGMax

−

: Controller maximum clamp voltage, 12.5V

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