PI2121 datasheet(17/21 Pages) VICOR

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PI2121

Rev. 1.2 Page 17 of 21

Figure 22: Two PI2121 in High Side ORing

configuration

Typical Application Example 2:

Requirement:

Redundant Bus Voltage = 1.2V

Load Current = 100A (assume through each

redundant path)

Auxiliary Voltage = 12V

Solution:

Five PI2121’s for each redundant 1.2V power source

should be used, configured in a master / slave

configuration as shown in the circuit schematic in

Figure 23.

Vaux: Since the Vaux voltage does not exceed the

VC pin clamp voltage, connect the Vaux directly to

each PI2121 VC pin.

SP and SN pins: For each specific PI2121, connect

each SP pin to the respective S pins and each SN

pin to the respective D pins. The master unit will

perform the sensing function.

BK pin: Connect the Master PI2121 BK pin directly

to ground to achieve the minimum reverse current

response time, and connect the BK pin of the slaved

PI2121’s to the respective local VC pin.

SL pin: For each set of parallel PI2121’s connect

the

SL pins together.

FT pin: Connect the FT pin of the Master PI2121

to a logic input and to the logic power supply via a

10KΩ resistor.

Program UV and OV of the Master PI2121 to

monitor Input Voltage:

Program UV at 1.1V and OV at 1.3V

Use the three-resistor divider configuration:

200

500

or 2.49kΩ 1%

⎟

⎠

⎞

⎜

⎝

⎛

−

452

or 453Ω 1%

()

⎟

⎠

⎞

⎜

⎝

⎛

−

500

453

or 3.57k

Ω 1%

END OF LIFE

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