Vicor PI2002-EVAL1 User Manual

Picor Corporation • www.picorpower.com PI2002-EVAL1 User Guide Rev 1.0 Page 1 of 11

Introduction

The PI2002-EVAL1 allows the user to test the basic principle
and operational characteristics of an Active ORing with Load
Disconnect function in a redundant power architecture, while
also experiencing the benefits and value of the PI2002
solution versus conventional Active ORing solutions. The
PI2002-EVAL1 evaluation board is configured to receive two
independent power source inputs, per a typical redundant
power architecture, through two Active ORing channels
that are combined to form a redundant power output.
Each channel contains a PI2002 controller and two N-channel
power MOSFETs (configured back-to-back). The MOSFET
footprints can take SO-8 or Power SO-8 MOSFET packages.
Each channel is capable of up to 20 A.

The PI2002-EVAL1 evaluation board is designed with
optimized PCB layout and component placement to represent
a realistic high density final design for an embedded Active
ORing with Load Disconnect solution for ≤ 7 Vbus

applications requiring up to 20 A. This evaluation board is
intended as an easy and simple way to test the electrical and
thermal performance of the PI2002 Active ORing with Load
Disconnect controller.

Both dynamic and steady state testing of the PI2002 can be
completed on the PI2002-EVAL1 evaluation board, in addition
to using the key features of the product. Dynamic testing can
be completed under a variety of system level fault conditions
to check for response time to faults.

This document provides basic instructions for initial start-up
and configuration of the evaluation board. Further
information on the functionality of the PI2002 can be
found in the PI2002 product data sheet.

PI2002-EVAL1

Cool-ORing™ Series

PI2002-EVAL1 Active ORing With Load Disconnect

Evaluation Board User Guide

®

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 1

PI2002 Product Description . . . . . . . . . . . . . . . . . . Page 2

Evaluation Board Terminal Description . . . . . . . . Page 2

Evaluation Board Schematic . . . . . . . . . . . . . . . . . Page 3

Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3

Evaluation Board Configuration . . . . . . . . . . . . . . Page 4

Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4

PCB Layouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10

Evaluation Board Mechanical Drawing . . . . . . . Page 10

PI2002-EVAL1 Evaluation Board
featuring the Cool-ORing PI2002
Active ORing controller.

Cool-ORing™ Series

The PI2002-EVAL1 Evaluation Board is intended to acquaint the

user with the benefits and features of the Cool-ORing

TM

PI2002

Active ORing with Load Disconnect solution. It is not designed to

be installed in end-use equipment.

Please read this document before setting up the PI2002-EVAL1
Evaluation Board and refer to the PI2002 product data sheet
for device specifications, functional description and
characteristics.

During operation, the power devices and surrounding
structures can be operated safely at high temperatures.

• Remove power and use caution when connecting and
disconnecting test probes and interface lines to avoid
inadvertent short circuits and contact with hot surfaces.

• When testing electronic products always use approved
safety glasses. Follow good laboratory practice and . .
procedures.

Picor Corporation • www.picorpower.com 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 over­temperature 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 Ω) -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

Cool-ORingTMPI2002 Product 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

Picor Corporation • www.picorpower.com PI2002-EVAL1 User Guide Rev 1.0 Page 3 of 11

Vin1

Figure 2 – PI2002-EVAL1 Evaluation Board schematic.

Item QTY Reference Designator Value Description Footprint Manufacturer

1 2 C1, C2 1 µF

Capacitor, MLCC X5R,

0603

1 µF,16 V

2 1 C9 22 µF

Capacitor, MLCC X7R,

1210

22 µF, 25 V

3 4 C3, C4, C7, C8 Not installed 1206

4 2 C2, C3 18 nF

Capacitor, MLCC X5R,

0603

18 nF,25 V

5 2 D1, D2 LED, Super Red THIN 0603 Lite-On, Inc.,

66

FT1, FT2, Rtn1, Rtn2,

Turret Test point TURRET-1528

Keystone

Vaux1, Vaux2 Electronics

78

Gnd1, Gnd2, Gnd3, Gnd4,

Turret Test point TURRET-1502

Keystone

Vin1, Vin2, Vout1, Vout2 Electronics

8 2 J5, J6 Header Pins 0.1" pitch 2 x 3mm

9 4 Q1, Q2, Q3, Q4

FDS8812NZ

SO-8 Fairchild

30 V, 20 A, N-MOSFET
10 2 R1, R12 8.45 KΩ Resistor,8.45 KΩ,1% 0603
11 2 R2, R13 13.3 KΩ Resistor,13.3 KΩ,1% 0603
12 4 R3, R4, R14, R15 2.00 Ω Resistor, 2.00 Ω, 1% 0603
13 6 R5, R6, R7, R16, R17, R18 0 Ω Resistor, 0 Ω 0603
14 2 R8, R9, R19, R20 Not Installed 0603
15 2 R10, R21 4.99 kΩ Resistor, 4.99 Ω, 5% 0603
16 2 R11, R22 10 Ω Resistor, 10 Ω, 5% 0603

17 2 U1, U2 PI2002

Picor Active ORing 3 mm x 3 mm;

PICOR

with Load Disconnect Controller 10-TDFN

Table 3 – PI2002-EVAL1 Evaluation Board bill of materials

Vaux1 Vaux1

Gnd1

Rtrn1

R1

8.45K
1%

R3

2.00k
1%

R2

13.3k
1%

R4

2.00k
1%

Not Installed

Q1

FDS8812NZ
8
7
6
5

C3

R5

0

C2

18nF

3
2
1

4

7

SP

9

UV

10

OV

4

OCT

Q2

FDS8812NZ

3
2
1

R6

5

2

G

D
N
G

1

8
7
6
5

4

8

IC1
PI2002

SN

3

VC

6

FT

5

SCD

C4

R7

Not Installed

0

FT1

VC1

R10

FT1

4.99K

J5

Not Installed

R9

VoutVin1

R8

Not Installed

Red LED

D1

Vaux1

R11
10

C1
1uF

Out1

Out2

Gnd3

Gnd4

Q4

DS8812NZ

F

3
2
1

R17

5

2

G

GND

1

8
7
6
5

C5
1uF

C9
22uF

4

8

IC2
PI2002

SN

3

VC

6

FT

5

SCD

R18

FT2

C8

Not Installed

VC2

R21

4.99K

R20

Not Installed

R19

Not Installed

Red LED

D2

Vaux2

R22
10

0

FT2

J6

Vin2

Vaux2 Vaux2

Gnd2

Rtrn2

Vin2

R12

8.45k
1%

R14

2.00k
1%

R13

13.3k
1%

R15

2.00k
1%

C7

Not Installed

R16

C6

18nF

0

8
7
6
5

9

10

4

Q3

FDS8812NZ

4

7

UV

OV

OCT

3
2
1

SP

Initial Test Set Up

To test the PI2002-EVAL1 evaluation board it is necessary to
configure the jumpers (J5 and J6) first based on the required
board configuration.

Failure to configure the jumpers prior to the testing may
result in improper circuit behavior.

Baseline Test Procedure (Refer to Figure 3)

1.0 Recommended Equipment

1.1 Two DC power supplies - 0-10 V; 25 A.

1.2 DC power supply 12 V; 100 mA.

1.3 DC electronic load - 30 A minimum.

1.4 Digital Multimeter

1.5 Oscilloscope.

1.6 Appropriately sized interconnect cables.

1.7 Safety glasses.

1.8 PI2002 Product Data sheet.

Figure 3 – Layout configuration for a typical redundant power application, OCD configured for fast gate turn on.

Picor Corporation • www.picorpower.com PI2002-EVAL1 User Guide Rev 1.0 Page 4 of 11

Reference Designator Value Functional Description

C1, C5 1 µF VC Bypass Capacitor
C9 22 µF Output (Load) Capacitor
C3, C4, C7, C8 Not installed Snubber to reduce voltage ringing when the device turns off
C2, C6 18 nF OCT off timer Capacitor
D1, D2 LED To indicate a fault exist when it is on
J5, J6 Jumper SCD to select for Gate high charge current or Gate low charge current
Q1, Q2, Q3, Q4 N-MOSFET ORing Main Switch
R1, R12 8.45 KΩ UV Voltage Divider Resistor ( R2UV in Figure 4)
R2, R13 13.3 KΩ OV Voltage Divider Resistor ( R2OV in Figure 4)
R11, R22 10 Ω VC Bias resistor
R10, R21 4.99 KΩ LED Current Limiter
R3, R14 2.00 KΩ UV Voltage Divider Resistor ( R1UV in Figure 4)
R4, R15 2.00 KΩ OV Coltage Divider Resistor ( R1OV in Figure 4)
R7, R14 Not Installed SCD Ground connecting Resistor
U1, U2 PI2002 Picor Active ORing with Load Disconnect Controller

Table 4 – Component functional description