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PI2002-EVAL1 User Guide Rev 1.0 Page 2 of 11

The Cool-ORing™ PI2002 with two external back-to-back

configured industry standard N-channel MOSFETs is a

complete Active ORing solution that also provides a Load

Disconnect feature designed for use in redundant power

system architectures. The PI2002 controls back-to-back

MOSFETs providing true bi-directional switch capabilities to

protect against both power source and load fault conditions.

The gate drive output turns the MOSFETs on in normal steady

state operation, while achieving high-speed turn-off under

a variety of potential system-level fault conditions, per

conventional Active ORing solutions with auto-reset once

the fault clears. The PI2002 has the added benefit of being

able to protect against output load fault conditions that

may induce excessive forward current and device over-

temperature by removing gate drive from the MOSFETs

with an auto-retry programmable off-time. The back-to-back

MOSFETs drain-to-drain voltage is monitored to detect

normal forward, excessive forward, light load and reverse

current flow. The PI2002 provides an active low fault flag

output to the system during excessive forward current,

reverse current, light load, under-voltage, over-voltage and

over-temperature. A temperature sensing function turns

off the MOSFETs and indicates a fault if the junction

temperature exceeds 145°C.

Figure 1 shows a photo of the PI2002-EVAL1 evaluation

board, with two PI2002 controllers and four N-channel

MOSFETs used to form the two Active ORing channels that

also feature a Load Disconnect function. The board is built

with two identical Active ORing circuits with options and

features that enable the user to fully explore the capabilities

of the PI2002 universal Active ORing with Load Disconnect

controller.

Figure 1 – PI2002-EVAL1 Evaluation Board (1.8" x 1.8")

Terminals Rating

Vin1, Vin2

8 V / 20 A

Vaux1, Vaux2, (R11 = R19 = 10

-0.3 V to 17.3 V / 40 mA

FT1, FT2

-0.3 V to 17.3 V / 10 mA

Terminal

Description

Vin1

Power Source Input #1 or bus input designed to accommodate up to 20 A continuous current.

Vaux1

Auxiliary Input Voltage #1 to supply PI2002 VC power. Vaux1 should be equal to Vin1 plus 5 V or higher.

See details in Auxiliary Power Supply (Vaux) section of the PI2002 data sheet.

Rtn1

Vaux1 Return Connection: Connected to Ground plane

Gnd

Vin & Vout Return Connection: Three Gnd connections are available and are connected to a common point, the Ground

plane. Input supplies Vin1 & Vin2 and the output load at Vout should all be connected to their respective local Gnd connection.

Vin2

Power Source Input #2 or bus input designed to accommodate up to 20 A continuous current.

Vaux2

Auxiliary Input Voltage #2 to supply PI2002 VC power. Vaux2 should be equal to Vin2 plus 5 V or higher.

See details in Auxiliary Power Supply (Vaux) section of the PI2002 data sheet.

Rtn2

Vaux2 Return Connection: Connected to Ground plane

FT1

PI2002 (U1) Fault Pin: Monitors U1 fault conditions

FT2

PI2002 (U2) Fault Pin: Monitors U2 fault conditions

Vout

Output: Q2 and Q4 MOSFET Drain pins connection, connect to the load high side.

Table 1 – PI2002-EVAL1 Evaluation Board terminals description

Jumper

Description

J5, J6

SCD Jumpers: Connect jumper across the two pins to the input side (GND) for maximum Gate charge current or across

the two pins on the output side to connect to the resistive voltage divider to the output.

Table 2 – PI2002-EVAL1 Evaluation Board jumpers description