PI2127 Datasheet, PDF (10/19 Pages) Vicor Corporation – 60 Volt, 12 Amp Full-Function Active ORing Solution

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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 (V_S-PG) to
11.7V typically.
A bias resistor (R_PG) is required if the voltage at the S
pin is higher than the minimum Voltage Clamp (V_S-
CLM^{). R}PG ^{should be connected between PG pin and}
ground (V_S return).
Minimize the resistor value for low S voltage levels to
avoid a voltage drop that may reduce V_S-PG lower than
required.
Select the value of R_PG using the following equations:
R _PG
=
V −V _{S −min}
S − PGMax
I_{VC max} + 0.1mA
R_PG maximum power dissipation:
Pd _RPG
=
(V_{S −max}
− V_{S −PGMin} ) ²
R _PG
Where:
V_S−min : S pin minimum applied voltage
V_S−max : S pin maximum applied voltage
V_S−PGMax : Controller maximum clamp voltage, 12.5V
Picor Corporation • picorpower.com
PI2127
Rev 1.3
Page 10 of 19