PI2126-EVAL1


PI2126-EVAL1
Cool ORing® Series
PI2126-EVAL1 30V/12A Full-Function High Side Active ORing
Evaluation Board User Guide
Content
Cool-ORing® Series
Page
Introduction ................................................................................... 1
Product Description ....................................................................... 2
Schematic. ..................................................................................... 3
Bill of Material ............................................................................... 3
Test Procedure ............................................................................... 4
Recommended Material ................................................................ 4
Thermal Imaging: ........................................................................... 6
PCB Layout ..................................................................................... 7
PI2126-EVAL1 Evaluation Board
featuring the Cool-ORing PI2126
Full-Function Active ORing Solution.
Mechanical Drawing ...................................................................... 7
The PI2126-EVAL1 Evaluation Board is intended to
acquaint the user with the benefits and features of the
®
Cool-ORing PI2126 full-function Active ORing solution. It
is not designed to be installed in end-use equipment.
Please read this document before setting up the PI2126EVAL1 Evaluation Board and refer to the PI2126 product
datasheet 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.
Introduction
The PI2126-EVAL1 allows the user to test the basic
principles and operational characteristics of an Active
ORing function in a redundant power architecture, while
also experiencing the benefits and value of the PI2126
solution versus conventional Active ORing solutions. The
PI2126-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 is capable of up to 12A, and is
suitable for 12V redundant bus voltages.
The PI2126-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 solution for 12V BUS applications
Picor Corporation • picorpower.com
requiring up to 12A. This evaluation board is intended as
an easy and simple way to test the electrical and thermal
performance of the PI2126 Full-Function Active ORing
solution.
Both dynamic and steady state testing of the PI2126 can
be completed on the PI2126-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 startup and configuration of the evaluation board. Further
information on the functionality of the PI2126 can be
found in the PI2126 product datasheet.
PI2126-EVAL1 User Guide
Rev. 1.0
Page 1 of 8
®
Cool-ORing PI2126 Product Description
®
The PI2126 Cool-ORing is a complete full-function Active
ORing solution with a high-speed ORing MOSFET
controller and a very low on-state resistance MOSFET
designed for use in redundant power system
architectures. The PI2126 Cool-ORing® solution is offered
in an extremely small, thermally enhanced 5mm x 7mm
LGA package and can be used in high side, medium
voltage Active ORing applications. The PI2126 enables
extremely low power loss with fast dynamic response to
fault conditions, critical for high availability systems.
The PI2126, with its 30V/5.5mΩ internal MOSFET
provides very high efficiency and low power loss during
steady state operation, while achieving high-speed turnoff of the internal MOSFET during input power source
fault conditions that cause reverse current flow. The
PI2126 provides an active low fault flag output to the
system during reverse current, excessive forward overcurrent and UVLO fault conditions.
Figure 1: PI2126-EVAL1 Evaluation Board (1.8” x 1.8”)
Terminals Maximum Rating.
Vin1+, Vin2+,
15V/12A
Vout+
15V/24A
1,
20V / 10mA
2
Figure 1 shows a photo of the PI2126-EVAL1 evaluation
board, with two PI2126 SiPs 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
PI2126 Cool-ORing® solution.
Terminal
Description
Vin1+
Power source Input #1: or bus input designed to accommodate up to 15V and 12A continuous current.
Vin2+
Power source Input #2: or bus input designed to accommodate up to 15V and 12A continuous current.
1
PI2126 (U1) Fault pin: referenced to the Gnd terminal (Gnd)
2
PI2126 (U2) Fault pin: referenced to the Gnd terminal (Gnd)
Vout
Output: U1 and U2 D pins connection, connect to the load high side.
S1 and D1
U1 Source to Drain Kelvin test points
S2 and D2
U2 Source to Drain Kelvin test points
Gnd
Return Connection: Four 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 Rtn
connection.
Note: Gnd, Gnd and Gnd are connected to the same point at the PCB bottom layer
Table 1: PI2126-EVAL1 Evaluation Board Terminals Description
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PI2126-EVAL1 User Guide
Rev. 1.0
Page 2 of 8
Figure 2: PI2126-EVAL1 Evaluation Board schematic.
Item
Qty
Reference Designator
Value
Description
1
4
C1, C2, C3, C4
2
1
C5
100uF
3
1
C6
Not Installed
MLCC 1uF, 25V
4
2
D1, D2
LTST-C191CKT
LED, Red
5
6
1,
6
8
Vin1+, Vin2+, Vout, Vout,
Gnd, Gnd, Gnd, Gnd
7
2
R1, R2
Not Installed
8
2
R3, R4
0Ω
9
2
R5, R6
20kΩ
10
1
U1, U2
PI2126-00-LGIZ
2, S1, S2, D1, D2
Not Installed
MLCC, X7R,1uF,50V
Electrolytic 100uF, 63V
Footprint
Manufacturer
1206
Panasonic _E/F
Panasonic
0603
0603 LED
Lite-On
1528
Turret Test point
TURRET - 1528
Keystone
Electronics
1502
Turret Test point
TURRET - 1502
Keystone
Electronics
1206
Resistor, 0Ω
0603
Resistor,1.5K,1%
0603
12A 30V Full-Function
Cool-ORing® Solution
5mm x 7mm 25 pin
PICOR
Table 2: Complete PI2126-EVAL1 Evaluation Board Bill of Material
Picor Corporation • picorpower.com
PI2126-EVAL1 User Guide
Rev. 1.0
Page 3 of 8
Reference Designator
C1, C2, C3, C4
Value
Not installed
Functional Description
Snubber to reduce voltage ringing when the device turns off
C3
22μF
Output (Load) Capacitor
C6
2.2uF
Output (Load) Capacitor
D1, D2
LED
R1, R2
Not Installed
R3, R4
0Ω
R5, R6,
20KΩ
U1, U2
PI2126-01-LGIZ
To indicate a fault exists when it is on
Bias resistor optional, can be used to replace the internal resistor. Remove R3, and R4 if
the this option is desired.
Controller bias input through internal resistor.
LED current limit resistor, selected to operate at 3.3V and 5.0V logic voltage. Replace R5
and R6 with the proper resistor value for different logic voltage.
Cool-ORing® SiP.
Table 3: Component functional description
Figure 3: Layout configuration for typical redundant power application, using PI2126-01-LGIZ
Test Procedure:
Initial Test Set Up
Baseline Test Procedure – PI2126 (Refer to Figure 3)
PI2126-EVAL1 designed with two input bias
configurations, VC biased via external resistors (R1 and
R2) or VC biased via the internal resistor (VR input pin,
RBias=420Ω ±30%). PI2126-EVAL1 is configured with
the internal bias resistors, R3 and R4 are installed
where R1 and R2 were not installed. If external VC
bias resistor with higher accuracy is desire, remove R3
and R4 before installing R1 and R2.
1.
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Recommended Material
1.1. Material Needed-Picor supplied
1.1.1. PI2126-EVAL1
1.1.2. PI2126 Product Datasheet
1.2. Recommended Users Supplied Equipment
1.2.1. Two DC power supplies: 0-20V; 15A 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.
PI2126-EVAL1 User Guide
Rev. 1.0
Page 4 of 8
Before initial power-up follow these steps to configure
the evaluation board for specific end application
requirements:
2.
Hook Up of the Evaluation Board
2.1. Connect the positive terminal of PS1 power
supply to Vin1+. Connect the ground terminal
of PS1 to Gnd. Set the power supply to 12V.
Keep PS1 output disabled, off.
2.2. Connect the positive terminal of PS2 power
supply to Vin2+. Connect the ground terminal
of PS2 to Gnd. Set the power supply to 12V.
Keep PS2 output disabled, off.
2.3. Connect the electronic load to the output
between Vout and Gnd. Set the load current to
5A.
2.4. Enable (turn on) PS1 power supply output.
2.5. Turn on the electronic load.
2.6. Verify that Vout+ voltage is a few millivolts
below 12V. This verifies that the PI2126 (U1)
internal MOSFET is in conduction mode.
2.7. Verify that Vin2+ is low. This verifies that the
PI2126 (U2) internal MOSFET is off.
2.8. Enable (turn on) PS2 output.
2.9. 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.
2.10. Disable (turn off) PS1, and PS2 outputs.
2.11. Enable (turn on) PS2 output.
2.12. Verify that the electronic load voltage reading is
few millivolts below 12V. This verifies that the
PI2126 (U2) internal MOSFET is in conduction
mode.
2.13. D2 should be off. This verifies that there is no
fault condition.
2.14. Verify that Vin1+ is low. This verifies that the
PI2126 (U1) internal FET is off.
Note: When the PI2126 internal MOSFET is in the on
state, it will not turn off unless a reverse current
greater than 1.1A is sensed in the MOSFET.
When both power supplies are enabled and both
PI2126 MOSFETs are in RDS(on); if one of the sources
(Power supplies) removed or disabled both PI2126
stay on unless the disabled power supply sources
current greater than 1.1A when turned off.
3.
Internal MOSFET RDS(on) Measurement:
3.1. The internal MOSFET RDS(on) can be measured
with a voltmeter between the S1 and D1 Kelvin
connection for U1 and between the S2 and D2
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Kelvin connection for U2. The potential between
S1 and D1 is the voltage drop across the internal
MOSFET and:
Where:
:
:
Voltage drop across the internal MOSFET
Input current.
Note: The RDS(on) value is temperature dependent and the
junction
temperature
increases
directly
proportional to power dissipation.
4.
Input short circuit test:
PI2126 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 PI2126
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 (C5) should be installed.
4.4. Place the scope probes very close to the PI2126 S
and D pins to measure Vin and Vout, and make
sure that the scope ground leads are very short.
You may use a close by ground pad for the scope
probe return, such as C1, C2, C3 and C4 return
pads.
4.5. Apply a short at one of the inputs (Vin1+ or Vin2+)
when both SiP’s (U1 and U2) are on, PS1 and PS2 are
enabled. The short can be applied electronically using
a MOSFET connected between Vin+ and Gnd or simply
by connecting Vin+ to Gnd. Then measure the
response time between when the short is applied and
the PI2126 internal MOSFET is disconnected (or
turned off). An example for the PI2126 response time
to an input short circuit is shown in Figure 4.
PI2126-EVAL1 User Guide
Rev. 1.0
Page 5 of 8
Short released
Applied a Short
Applied a
Short
MOSFET Starts
to turn off
Test:
Both input sources are turned
on and sharing the load
current, then applied a short
between Vin1+ and Gnd for
1ms.
Vout(5V/div)
MOSFET
turned off
Vin1+ (5V/div)
Current
Reversed
Iin1 (5A/div)
Test Setup:
DUT: PI2126-EVAL1
Vin1+ = 12V
Vin2+ = 12V
Output Load = 12A
Test purpose:
To show the PI2126 response
to a fault condition, where the
output of the input source is
shorted or tried to source
current from the load (Vout).
83ns
Figure 4: Plot of PI2126 response time to reverse current detection
MOSFET
MOSFET
PI2126
PI2126
Figure 5: PI2126 mounted on PI2126-EVAL1, Iout=12A,
TA=25°C, Air Flow=0LFM
Figure 6: PI2126 mounted on PI2126-EVAL1, Iout=12A,
TA=25°C, Air Flow=200LFM
Thermal Imaging:
Picor Corporation • picorpower.com
PI2126-EVAL1 User Guide
Rev. 1.0
Page 6 of 8
PCB Layout
Figure 7: PI2126-EVAL1 layout top layer. Scale 2.0:1
Figure 8: PI2126-EVAL1 layout bottom layer 2. Scale 2.0:1
Mechanical Drawing
Figure 9: PI2126-EVAL1 evaluation board mechanical drawing.
Picor Corporation • picorpower.com
PI2126-EVAL1 User Guide
Rev. 1.0
Page 7 of 8
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
25 Frontage Road
Andover, MA 01810
USA
Picor Corporation
51 Industrial Drive
North Smithfield, RI 02896
USA
Customer Service: [email protected]
Technical Support: [email protected]
Tel: 800-735-6200
Fax: 978-475-6715
Picor Corporation • picorpower.com
PI2126-EVAL1 User Guide
Rev. 1.0
Page 8 of 8