Vicor PI2007-EVAL2 User Manual

Picor Corporation • picorpower.com

PI2007-EVAL2 User Guide Rev. 1.1 Page 1 of 9

PI2007-EVAL2 12V/15A High Side Active ORing

Evaluation Board User Guide

Content Page

Introduction ......................................................... 1

Product Description ............................................ 2

Schematic ........................................................... 3

Bill of Material...................................................... 4

Test Procedure .................................................... 5

Recommended Material ...................................... 5

PCB Layout ......................................................... 8

Mechanical Drawing ............................................ 8



PI2007-EVAL2

Cool-ORing® Series

Cool-ORing® Series

PI2007-EVAL2 Evaluation Board
featuring the Cool-ORing PI2007

Active ORing controller.

The PI2007-EVAL2 Evaluation Board is intended to
acquaint the user with the benefits and features of the

Cool-ORing® PI2007 full function Active ORing solution.

It is not designed to be installed in end-use equipment.

Please read this document before setting up the
PI2007-EVAL2 Evaluation Board and refer to the
PI2007 product datasheet for device specifications,
functional description and characteristics.

Introduction

The PI2007-EVAL2 allows the user to test the basic
principle and operational characteristics of an Active ORing
function in a redundant power architecture, while also
experiencing the benefits and value of the PI2007 solution
versus conventional Active ORing solutions. The PI2007­EVAL2 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 PI2007 controller and a 25V N­channel power MOSFET. The MOSFET foot print can take
an SO-8 or Power SO-8 MOSFET package. Each channel is
capable of up to 15A.

The PI2007-EVAL2 evaluation board is designed with
optimized PCB layout and component placement to
represent a realistic high density final design for an

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.

embedded high side Active ORing solution for 12V Bus
(10V to 14V) applications requiring up to 15A. This
evaluation board is intended as an easy and simple way to
test the electrical and thermal performance of the PI2007
Active ORing controller.

Both dynamic and steady state testing of the PI2007 can be
completed on the PI2007-EVAL2 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 start­up and configuration of the evaluation board. Further
information on the functionality of the PI2007 can be
found in the PI2007 product data sheet.

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PI2007-EVAL2 User Guide Rev. 1.1 Page 2 of 9

Cool-ORing® PI2007 Product Description

Terminals Maximum Rating

Vin1, Vin2,

25V/15A

Vout

25V/30A

1, 2

-0.3V to 17.3V / 10mA

VL1, VL2 (R5=R6=1.5kΩ)*

5.5V

* VL1, VL2 voltage can be higher than 5.5V, but R5 and R6

values have to be increased to accommodate the LEDs

Terminal

Description

Vin1

Power source Input #1 or bus input designed to accommodate up to 15A continuous current.

Vin2

Power source Input #2 or bus input designed to accommodate up to 15A continuous current.

1

PI2007 (U1) Fault pin: Monitors U1 fault conditions.

2

PI2007 (U2) Fault pin: Monitors U2 fault conditions.

VC1

PI2007 (U1) VC input: Leave this pin unconnected unless an alternative controller bias voltage.

VC2

PI2007 (U2) VC input: Leave this pin unconnected unless an alternative controller bias voltage.

VL1

Fault pin 1 LED supply

VL2

Fault pin 2 LED supply

Vout

Output: Q1 and Q2 MOSFETs drain connection, connect to the load high side.

Rtn

Return Connection: Three Rtn 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 Rtn connection.

The Cool-ORing PI2007 with an external industry
standard 25V N-channel MOSFET provides a complete
Active ORing solution designed for use in 12V Bus (10V to
14V) redundant power system architectures. The PI2007
controller with an N-channel MOSFET enables extremely
low power loss with fast dynamic response to fault
conditions, critical for high availability systems.

The PI2007 controller with a low R

N-channel

DS(on)

MOSFET provides very high efficiency and low power loss
during steady state operation. The PI2007 controller
provides an active low fault flag output to the system
during excessive forward current or reverse current, or
under VC under voltage condition.

Figure 1 shows a photo of the PI2007-EVAL2 evaluation
board, with two PI2007 controllers and two N-channel
MOSFET used to form the two Active ORing channels. 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 PI2007 Active ORing controller.

Figure 1: PI2007-EVAL2 Evaluation Board (1.8” x 1.8”)

Table 1: PI2007-EVAL2 Evaluation Board Terminals Description

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PI2007-EVAL2 User Guide Rev. 1.1 Page 3 of 9

Schematic

Figure 2: PI2007-EVAL2 Evaluation Board schematic.

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PI2007-EVAL2 User Guide Rev. 1.1 Page 4 of 9

Bill of Material

Item

QTY

Ref. Designator

Value/Part NO.

Description

Footprint

Manufacturer

1 2 C1, C2, C3, C4

Not Installed

MLCC Capacitor, X7R, 1uF,50V

1206 2 2 C5, C6

1μF

MLCC Capacitor, X7R, 1uF,50V,

805 3 1 C7

22μF

Electrolytic Capacitor, 22uF,100V

Panasonic _E/F

Panasonic

4 1 C8

Not Installed

MLCC Capacitor, 10uF,25V

1812 5 2 D1, D2

LTST-C191CKT

LED, Red

0603 LED

Lite-On

6

6

1, 2, VC1,

VC2, VL1, VL2

1528

Turret Test point

TURRET - 1528

Keystone
Electronics

7

6

Rtn, Rtn, Rtn, Vin1,
Vin2, Vout

1502

Turret Test point

TURRET - 1502

Keystone
Electronics

8 2 Q1, Q2

SI4630DY-T1-GE3

N-MOSFET,25V,40A

PPAK SO-8

Siliconix

9 1 R1, R2

0Ω

Resistor,0 Ω,1%,0.1W

0603

10 1 R3, R4

430Ω

Resistor,430Ω, 1%, 0.125W

0805

11 1 R5, R6, R7, R8

Not Installed

12 2 R9, R10

1.5K

Resistor,1.5K,1%,0.1W

603

13 2 U1, U2

PI2007-00-QEIG

Picor Cool ORing Controller IC

3x3mm 10L TDFN

PICOR

Ref. Designator

Value/Part NO.

Functional Description

C1, C2, C3, C4

Not Installed

Snubber to reduce voltage ringing when the device turns off
Add the capacitors if a long harnesses are used to connect the power source or load to the

board.

C5, C6

1uF

VC Bypass Capacitor

C7

22uF

Output (Load) Capacitor

C8

Not Installed

Output (Load) Capacitor, this capacitor can be installed if instead of C7 if the user requires a
ceramic load capacitor, 1812 package can accommodate a high ceramic capacitors value at
25V rating.

D1, D2

LTST-C191CKT

To indicate a fault exists when it is on

Q1, Q2

SI4630DY-T1-GE3

ORing switch

R1, R2

0Ω

Gate resistor, optional to slow gate turn off time, higher value resistor will reduce gate pull
down peak current

R3, R4

430Ω

VC bias resistor

R5, R6,

Not Installed

Optional to use PI2007 external VC bias voltage, removing R3 and R4 when external bias
voltage is used.

R7, R8

Not Installed

Optional to use PI2007 internal VC bias resistor (VR) by placing 0Ω resistor and removing R3
and R4

R15, R16

1.5K

LED current limit resistor, selected to operate at 3.3V and 5.0V logic voltage. Replace R15
and R16 with the proper resistor value for different logic voltage.

U1, U2

PI2007

Cool ORing Controller

Table 2: PI2007-EVAL2 Evaluation Board Bill of Materials

Table 3: Component functional description

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PI2007-EVAL2 User Guide Rev. 1.1 Page 5 of 9

Test Procedure:

Figure 3: Layout configuration for a typical redundant power application using PI2007.

DC

Electronic

Load

PS1

-

PS2

+

-

+

-

0-20V/20A

30A

0-20V/20A

PS3

+

-

12V/100mA

Logic PS

+

Gate

Initial Test Set Up

PI2007-EVAL2 is designed with two bias circuit
options, bias via 1% external resistor (R3 and R4) or via
internal resistor (VR input). R3 and R4 resistors are
installed (430Ω, 1%).

Baseline Test Procedure – PI2007 (Refer to Figure 3)

1. Recommended Material

1.1. Material Needed-Picor supplied

1.1.1. PI2007-EVAL2

1.1.2. PI2007 Product Datasheet

1.2. Recommended Users Supplied Equipment

1.2.1. Two DC power supplies: 0-20V; 20A each.

1.2.2. One low power logic voltage power supply

1.2.3. Load: electronic Load, Power resistors or

actual load.

1.2.4. Multimeter.

1.2.5. Oscilloscope.

1.2.6. Appropriately sized interconnect cables.

1.2.7. Safety glasses.

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PI2007-EVAL2 User Guide Rev. 1.1 Page 6 of 9

Before initial power-up follow these steps to configure
the evaluation board for specific end application
requirement:

Note that PI2007 will not turn off the MOSFET unless it
senses current in the reverse direction through the
MOSFET. This means that if both input power source
are turned on and both MOSFET are in on condition,
then one off the power source is turned off, the
associated PI2007 will not turn off the MOSFET unless
the power source sinks current from the output when it
turns off and cause a reverse current in the MOSFET that
generates negative voltage equal or greater than 6mV.

2. Control Circuitry Bias:

PI2007 control circuitry and the gate driver for the
MOSFET are biased through the VC pin. An internal
regulator clamps VC pin voltage with respect to PG
pin (V

) to 11.7V typically. In a 12V application

VC-PG

the input voltage can vary between 10V and 14V
which is higher than the VC clamp voltage. A bias
resistor between VC pin and input voltage is required
to accommodate VC clamp.

3.6. Enable (turn on) PS3 power supply output.

3.7. Turn on the electronic load.

3.8. Verify that the load voltage (Vout) is few

millivolts below 12V. This verifies that the Q1
MOSFET is in conduction mode.

3.9. Verify that Vin2 is low. This verifies that Q2

MOSFET is off.

3.10. Enable (turn on) PS2 output.

3.11. Verify that both PS1 and PS2 are sharing load

current evenly by looking at the supply current.

Power supplies output may need adjustment to
set current sharing between the supplies.

3.12. Disable (turn off) PS1, PS2, and PS3 outputs.

3.13. Enable (turn on) PS2 output then Enable and PS3

outputs.

3.14. Verify that Vout is few millivolts below 12V. This

verifies that the MOSFET Q2 is in conduction
mode.

3.15. D2 should be off. This verifies that there is no

fault condition.

PI2007-EVAL2 has two options for the bias resistor. A
420Ω internal resistor connected between VC pin
and VR pin, or 430Ω 1% external resistor (R3 and R4).
R3 and R4 installed in PI2007-EVAL2. If the internal
resistor is desired for the test, remove R3 and R4,
and install 0Ω resistor (jumper) for R7 and R8 to
connect PI2007 VR pin to its input.

3. Hook Up of the Evaluation Board

3.1. Connect the positive terminal of PS1 power

supply to Vin1. Connect the ground terminal of
PS1 to its local Rtn. Set the power supply to
12V. Keep PS1 output disabled, off.

3.2. Connect the positive terminal of PS2 power

supply to Vin2. Connect the ground terminal of
PS2 to its local Rtn. Set the power supply to
12V. Keep PS2 output disabled, off.

3.3. Connect the logic power supply PS3 positive

terminal to VL1 and VL2. Connect the ground
terminal of this power supply to a Rtn terminal.
Set the power supply to the desired logic
voltage level, 3.3V or 5V. Keep PS3 output
disabled, off.

3.4. Connect the electronic load to the output

between Vout and its local Rtn. Set the load
current to 5A.

3.5. Enable (turn on) PS1 power supply output.

3.16. Verify that Vin1 is low. This verifies that the

MOSFET (Q1) is off.

4. Input short circuit test:

PI2007 has a very fast response (80ns) to a reverse current
(Input short) fault condition. Measuring a short period
event requires attention to the test set-up. Before
proceeding, consider the following:

4.1. To emulate a real application, the BUS supplies

for this test should have a solid output source
such as a DC-DC converter that supplies high
current and can be connected very close to the
evaluation board to reduce stray parasitic
inductance. Or use the prospective supply
sources of the end application where the PI2007
will be used. Typical bench power supplies have
slow response to output load change. In this test
when the power supply output is shorted and
then released, the bench power supply may
produce high output voltage with high current
capability that may damage the device under
test.

4.2. Do not install Input capacitors (C1 and/or C2) in

this test.

4.3. Output capacitor (C7) should be installed.

4.4. Place the scope probes very close to the MOSFET

drain and source to measure Vout and Vin, and

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PI2007-EVAL2 User Guide Rev. 1.1 Page 7 of 9

make sure that the scope ground leads are very

Test Setup:
DUT: PI2007-EVAL2
Vin1 = 12V
Vin2 = 12V
Output Load = 6A

Test:

Both input sources are
turned on and sharing the
load current, then applied a
short for 1ms with fast turn
on 1mΩ MOSFET between
Vin1 and Rtn.

Test purpose:

To show the PI2007 response
to a fault condition, where
the output of the input
source is shorted or tried to
source current from the load
(Vout)

short. You may use a close by ground pad for
the scope probe return, such as C1, C2, C3 and
C4 Rtn pads.

4.5. Apply a short at one of the inputs (Vin1 or Vin2)

when both controllers (U1 and U2) are on, PS1
and PS2 are enabled. The short can be applied

electronically using a MOSFET connected
between Vin and Rtn or simply by connecting Vin
to Rtn. Then measure the response time
between when the short being applied and the
MOSFET being disconnected (or turned off). An
example for PI2007 response time to an input
short circuit is shown in Figure 4.

Figure 4: Plot of PI2007 response time to reverse current detection

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PI2007-EVAL2 User Guide Rev. 1.1 Page 8 of 9

PCB Layout

Figure 5: PI2007-EVAL2 layout top layer. Scale 2.0:1

Figure 6: PI2007-EVAL2 layout bottom layer 2. Scale 2.0:1

Mechanical Drawing

Figure 7: PI2007-EVAL2 evaluation board mechanical drawing

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PI2007-EVAL2 User Guide Rev. 1.1 Page 9 of 9

Warranty

Vicor products are guaranteed for two years from date of shipment against defects in material or
workmanship when in normal use and service. This warranty does not extend to products subjected to
misuse, accident, or improper application or maintenance. Vicor shall not be liable for collateral or
consequential damage. This warranty is extended to the original purchaser only.

EXCEPT FOR THE FOREGOING EXPRESS WARRANTY, VICOR MAKES NO WARRANTY, EXPRESS OR LIMITED,
INCLUDING, BUT NOT LIMITED TO, THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE.

Vicor will repair or replace defective products in accordance with its own best judgment. For service
under this warranty, the buyer must contact Vicor to obtain a Return Material Authorization (RMA)
number and shipping instructions. Products returned without prior authorization will be returned to the
buyer. The buyer will pay all charges incurred in returning the product to the factory. Vicor will pay all
reshipment charges if the product was defective within the terms of this warranty.

Information published by Vicor has been carefully checked and is believed to be accurate; however, no
responsibility is assumed for inaccuracies. Vicor reserves the right to make changes to any products
without further notice to improve reliability, function, or design. Vicor does not assume any liability
arising out of the application or use of any product or circuit; neither does it convey any license under its
patent rights nor the rights of others. Vicor general policy does not recommend the use of its
components in life support applications wherein a failure or malfunction may directly threaten life or
injury. Per Vicor Terms and Conditions of Sale, the user of Vicor components in life support applications
assumes all risks of such use and indemnifies Vicor against all damages.

Vicor’s comprehensive line of power solutions includes high density AC-DC and DC-DC modules and
accessory components, fully configurable AC-DC and DC-DC power supplies, and complete custom
power systems.

Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is
assumed by Vicor for its use. Vicor components are not designed to be used in applications, such as life
support systems, wherein a failure or malfunction could result in injury or death. All sales are subject to
Vicor’s Terms and Conditions of Sale, which are available upon request.

Specifications are subject to change without notice.

Vicor Corporation Picor Corporation
25 Frontage Road 51 Industrial Drive
Andover, MA 01810 North Smithfield, RI 02896
USA USA

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