UG:303 Page 1
USER GUIDE | UG:303
PI3749-x0-EVAL1
Cool-Power® ZVS Switching Regulators Buck-Boost Evaluation Board
Introduction 1
Bill of Materials 2
Typical Connections 4
Vicor PCB Edge
Connector Description 5
PAD Numbering 5
Schematic Symbol 6
PAD Definitions 6
PCB Design Files 7
Contents Page
Introduction
The PI3749-x0-EVAL1 evaluation board demonstrates the features and benefits of the Vicor ZVS
Buck-Boost regulator; pre-configured for a 24VOUT voltage and rated for over 160W of output power
up to 60°C and up to 120W at 85°C. Please refer to the corresponding PI3749-x0 data sheet for all
power specifications. The PI3749-x0-Eval1 evaluation board is used with the following ZVS buck-boost
products: PI3749-00, PI3749-20.
The evaluation board provides several options for applying input power (VIN and GND) and output load
(VOUT and GND). The user can solder tab-style banana jacks or wire, use threaded connectors with
retaining nuts or solder turret pins for clip-on connections.
The evaluation board comes with all of the PI3749-x0’s features accessible to the user. The
current-monitor function (IMON) is set-up to monitor the PI3749-x0’s output current, sensed across a
5mΩ resistor. The general purpose amplifier (VDIFF) comes pre-set with a gain of 2, but can be easily
reconfigured for differential measurements by adding extra 0603 resistors.
The I/O pins are brought out to the right edge of the evaluation board to allow for easy monitoring
or for adding additional circuitry. The status of the PGD pin is indicated by a dual colored LED; red
indicating a fault and green indicating no faults. The SYNCO (sync out) and SYNCI (sync in) pins are
accessible to allow for paralleling or for synchronizing to an external clock. Shorting J5 on the board will
connect the output of IMON to the positive input of the GP amplifier, allowing for user-designed signal
scaling and conditioning.
A footprint for an external soft-start capacitor (0603) is available to tailor the start-up profile of the
converter. The error amplifier’s output (EAO) is brought to a pin and in conjunction with the soft-start
pin can be used for paralleling converters. The error amplifier’s input (EAIN) is not directly connected to
a pin, but connects to the pin EXT_VREF via a 10kΩ series resistor. Appling a DC voltage to this pin will
allow the user to change the regulated output voltage without changing the feedback network.
The board is designed with an edge connector to facilitate testing at the factory, but this connection
can also be used for board evaluation. The PCB is 4-layer FR-4 170Tg material with 2oz copper per layer,
ENIG pad finish and a board thickness of 0.062in.
The board includes an I2C™ header for use with I2C-capable products like the PI3729-20. Note that the
I2C interface is inhibited by default by 0Ω resistors installed at RSDA and RSCL (refer to Table 1 Bill of
materials). These must be removed to enable I2C functionality.
UG:303 Page 2
Bill of Materials
Non-Populated Components
Table 1
Bill of materials
populated components
Table 2
Non-populated components
Qty Reference
Designator Value Description Manufacturer Manufacturer
Part Number
14
C1, C2, C3, C4, C5,
C7, C8, C9, C10, C11,
C12, C13, C14, CIN1
10µF Ceramic Cap, X5R,
50V, 1206 TDK C3216X5R1H106K160AB
1C6 0.1µF Ceramic Cap, X7R,
50V, 1206 Murata GRM319R71H104KA01D
1CCOMP 4.7nF Ceramic Cap, X7R,
50V, 0603 Murata GRM188R71H472KA01D
1CVDR 0.1µF Ceramic Cap, X7S,
100V, 0603 TDK CGA3E3X7S2A104K080AB
1D1 Fault Status 1 x 1mm Dual Color
SM LED Rohm SML-P24MUWT86
2FT1, FT2 TEST 1, TEST 2 SM Testpoint Keystone 5015
2J5, J6 0.1in Header Jumper Samtec TSW-148-07-F-S
1L1 65nH FP0404 Series
Inductor Cooper FP0404R1-R065-R
1LMAG 480nH HCV1206 Inductor Cooper HCV1206-R48-R
1PCB
PI3749-x0
Edge Connector
Eval Board
VICOR PCB0175rC
1PI3749 ZVS Buck-Boost,
I2C™ capable
Low-Voltage ZVS
B-B SIP 10 x 14mm VICOR PI3749-20-LGIZ
1R5 1.00kΩ Resistor, 1%,
0.1W, 0603 Rohm MCR03EZPFX1001
5RDIFF1, RDIFF2, REA3,
RPGD, RSYNCI 10.0kΩ Resistor, 1%,
0.1W, 0603 Rohm MCR03EZPFX1002
1REA1 14.0kΩ Resistor, 1%,
0.1W, 0603 Yageo RC0603FR-0714KL
1REA4 1.07kΩ Resistor, 1%,
0.1W, 0603 Yageo RC0603FR-071K07L
1RGP 49.9Ω Resistor, 1%,
0.1W, 0603 Rohm MCR03ERTF49R9
1RIN 1Ω Resistor, 1%,
0.25W, 1206 Rohm MCR18ERTFL1R0 0
1RSENSE 0.005Ω Resistor, 1%,
1W, 2512 Panasonic ERJ-M1WSF5M0U
3RSDA, RSCL, RZ1 0Ω Resistor, 1%,
0.1W, 0603 Rohm MCR03EZPJ000
1U1 NC7WZ14EP6X Dual Schmidt
trigger Inverter Fairchild NC7WZ14EP6X
Qty Reference Designator Description
3 REA2, RIMON, RZ2 Resistor, 1%, 0.1W, 0603
4 R1, R2, R3, R4 Factory Use Only
14 EAO, EXT_VREF, PGD, IMON, SGND1, SGND2,
SS/TRK, SYNCI, SYNCO, VDIFF, VDR, VIN, VSN, VSP Thru-hole Testpoints, Vector K24C
3 CEAIN1, CEAO, CTRK Ceramic Cap, 50V, 0603
1 CIN2 Bi-Polar Capacitor,
Nichicon UPW2A330MPD or equivalent
2 JVIN, JVOUT Johnson Jack, Tektronix 131503100
3 ENABLE, FT3, FT4 SM Test Point, Keystone 5015
1 JGP 0.1in Header Jumper
UG:303 Page 3
ADDR0
ADDR1
EAIN
SYNCO
SYNCI
EAO
+VO SENSE
PGD
Tie
VDR
-VO SENSE
VDR
SYNCO
SYNCI
PGD
ENABLE
COMP
TRK
SCL
SDA
VS1
VS2
EAO
TRK
SGND1
DNP
SGND2
DNP
PG SENSE
VIN_F
LGH
A7
EN
A5
SYNCI
B1
VDIFF A11
VS1 K4
EAIN A12
VSP A10
VSN A9
COMP
A8
SYNCO
C1
SCL
A3
ADDR0
A2 ADDR1
A1
SDA
A4
TRK
A6
SGND
B14
EAO
A13
VDR
E1
VS1 K5
VOUT J14
VOUT K13
VIN
J1
PGD
D1
VIN
H1
PGND
K7
VIN
K1
VS2 K10
VIN
K2
VIN
G1
VOUT H14
VOUT G14
PGND K8
VOUT K14
VS2 K11
IMON A14
IS+ E14
IS- D14
PI3749
CTRK
DNP
CCOMP
4.7nF
CEAO
DNP
10.0K
RPGD
ADDRO/FT2
ADDR1/FT1
CVDR
0.1uF
10.0K
RSYNCI
C1
10uF
C2
10uF
C3
10uF
C4
10uF
C5
10uF
C7
10uF
C8
10uF
C9
10uF
C10
10uF
C11
10uF
C12
10uF
1J2
1J3
1
J1
1
J4 PGND
VIN VOUT
VIN_FILT RSENSE
.005
IMON
DNP
R1
DNP
R3
DNP
R2
DNP
R4
ADDR1ADDR0
VDR
IMON
JVIN
JVOUT
VSP
VDIFF
VSN
VSP
C6
.1uF
ISN
C13
10uF
C14
10uF
DNP
RIMON
0.51RIN
ISP
Tie
VSN
VDIFF
10.0K
RDIFF1
10.0K
RDIFF2
14.0k
REA1
1.07k
REA4
49.9
RGP
JGP
DNP
CEAIN1
DNP
EXT_VREF
10.0K
REA3
DNP
REA2
DAC
PCB0175rC
PCB
PCB0175rC
DNP
RZ2
0
RZ1
VSP
IMON
Jumper J5 to connect IMON to VP for ATE Tesng.
DNP
CIN2
J6
SGNDENABLE
VSUPPLY
65nH
FP0404R1
L1
CIN1
10uF
Tie
A1
1
GND
2
A2
3Y2 4
VCC 5
Y1 6
U1
NC7WZ14
23
D1A
14
D1B
1.00k
R5
VDR
4
12
3
TOP VIEW
DUAL LED ORIENTATION
PGD
PC
B0175r
C
12
MECH PIN
3
LMAG
500nH
F1 F2
Fiducials
PCM0102
-VO SENSE 1
+ VO SENSE 1
SGND 1
EN 2
SDA 3
SCL4
H1
I2C Header
J5
SGND
0
RSCL
0
RSDA
Figure 1
Evaluation board schematic
UG:303 Page 4
Typical Connections
Figure 3 illustrates the typical input supply and output load connections required to power the
PI3749-x0 evaluation board. The test points on the right side of the board provide access to key nodes
used to assess the board's performance. The jumper "JGP" provides an access point that allows the
user to add a small signal in the feedback loop to make Gain/Phase measurements. The jumper J5 will
connect the IMON output signal to the positive input of the general purpose amplifier, allowing this
signal to be scaled. The J6 jumper will disable the converter when connected.
H1 provides optional access to the I2C interface, and includes SDA, SCL, EN and SGND JVIN is an
unpopulated "Johnson Jack" location that may be used to measure input ripple voltage.
Figure 2
Evaluation board details
Figure 3
Typical input and
output connections
UG:303 Page 5
Vicor PCB Edge Connector Description
SAMTEC Reference Mechanical Drawings: based on EXTreme LPHPower™ Socket Assembly series,
available from Samtec’s website PCB Dimensions:
Recommended PCB layout for LPHS-XX-XX-X-VXX-XX PCB Layout.pdf
Right-angle Socket: LPHS-XX-XX-X-RTX-XX-MKT.pdf
Vertical Socket: LPHS-XX-XX-X-VXX-XX-MKT.pdf
PAD Numbering
Figure 4
Edge connector details
Figure 5
Top (component) view
Figure 6
Bottom view
UG:303 Page 6
VOUT VIN
ADDR0ADDR1
SYNCO
VDR
DAC
VIN_FILT
ISN
SDA
SCL
ENABLE
EAO
VSP
VDIFF
PGD
VSN
SYNCI
1
2
3
4
5
6
7
8
P1 P2
P3 P4
SAMTEC LPHS-04-24
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
CN1
SAMTEC LPHS HORZ Edge Conn
Figure 7
Schematic of edge connector
PAD Definitions
Table 3
PAD Definitions PAD Name Descirption
P1, P2 PGND Power ground connection for the input supply and output load
P3 VOUT Output voltage connection
P4 VIN Input voltage connection
1, 2, 6, 7, 8, 10 SGND Signal ground used as reference for I/O measurements
11, 12 PGND Power ground used as reference for input and output voltage measurements
3 ENABLE Enable
4 SDA I2C™ Serial Data
5 SCL I2C Serial Clock
9 ADR1 I2C Address <1>
13 DAC External voltage node to adjust regulated output voltage (EXT_VREF)
14 EAO Error amplifier output
15 VDIFF Differential amplifier output
16 VSN Differential amplifier inverting input
17 VPN Differential amplifier non-inverting input
18 SYNCO Sync output pin
19 SYNCI Sync input pin
20 PGD Power good status pin
21 ADR0 I2C Address <0>
22 VDR Factory use only
23 ISN Remote-sensed output voltage, after the IMON resistor
24 VIN Input supply voltage measured at SiP’s input
Schematic Symbol
Limitation of Warranties
Information in this document is believed to be accurate and reliable. HOWEVER, THIS INFORMATION
IS PROVIDED “AS IS” AND WITHOUT ANY WARRANTIES, EXPRESSED OR IMPLIED, AS TO THE
ACCURACY OR COMPLETENESS OF SUCH INFORMATION. VICOR SHALL HAVE NO LIABILITY FOR THE
CONSEQUENCES OF USE OF SUCH INFORMATION. IN NO EVENT SHALL VICOR BE LIABLE FOR ANY
INDIRECT, INCIDENTAL, PUNITIVE, SPECIAL OR CONSEQUENTIAL DAMAGES (INCLUDING, WITHOUT
LIMITATION, LOST PROFITS OR SAVINGS, BUSINESS INTERRUPTION, COSTS RELATED TO THE REMOVAL
OR REPLACEMENT OF ANY PRODUCTS OR REWORK CHARGES).
Vicor reserves the right to make changes to information published in this document, at any time
and without notice. You should verify that this document and information is current. This document
supersedes and replaces all prior versions of this publication.
All guidance and content herein are for illustrative purposes only. Vicor makes no representation or
warranty that the products and/or services described herein will be suitable for the specified use without
further testing or modification. You are responsible for the design and operation of your applications
and products using Vicor products, and Vicor accepts no liability for any assistance with applications or
customer product design. It is your sole responsibility to determine whether the Vicor product is suitable
and fit for your applications and products, and to implement adequate design, testing and operating
safeguards for your planned application(s) and use(s).
VICOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN LIFE SUPPORT,
LIFE-CRITICAL OR SAFETY-CRITICAL SYSTEMS OR EQUIPMENT. VICOR PRODUCTS ARE NOT CERTIFIED
TO MEET ISO 13485 FOR USE IN MEDICAL EQUIPMENT NOR ISO/TS16949 FOR USE IN AUTOMOTIVE
APPLICATIONS OR OTHER SIMILAR MEDICAL AND AUTOMOTIVE STANDARDS. VICOR DISCLAIMS
ANY AND ALL LIABILITY FOR INCLUSION AND/OR USE OF VICOR PRODUCTS IN SUCH EQUIPMENT OR
APPLICATIONS AND THEREFORE SUCH INCLUSION AND/OR USE IS AT YOUR OWN RISK.
Terms of Sale
The purchase and sale of Vicor products is subject to the Vicor Corporation Terms and Conditions of Sale
which are available at: (http://www.vicorpower.com/termsconditionswarranty)
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Export may require a prior authorization from U.S. export authorities.
10/18 Rev 1.3 Page 8
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Andover, MA, USA 01810
Tel: 800-735-6200
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www.vicorpower.com
email
Customer Service: custserv@vicorpower.com
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