VICOR PI3741-0x-EVAL1 User manual

UG:305 Page 1
USER GUIDE | UG:305
PI3741-0x-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
PAD Definitions 6
PCB Design Files 7
Contents Page
Introduction
The PI3741‑0x‑EVAL1 evaluation board demonstrates the features and benefits of the Vicor ZVS
Buck‑Boost regulator; pre‑configured for either a 24 or 48V output voltage and rated for up to
150W. Please refer to the corresponding PI3741‑0x‑LGIZ data sheet for all power specifications. The
PI3741‑0x‑EVAL1 evaluation board is used with the following ZVS buck‑boost products:
PI3741‑00‑LGIZ, PI3741‑01‑LGIZ.
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 PI3741‑0x‑LGIZ’s features accessible to the user. The
current‑monitor function (IMON) is set up to monitor the PI3741‑0x‑LGIZ'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 between IMON
and VSP on the board will connect the output of IMON to the positive input of the general purpose
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. Applying 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.

UG:305 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
2.2µF Ceramic Cap, X7S,
100V, 1206 TDK C3216X7S2A225K160AB
1CCOMP 4.7nF Ceramic Cap, X7R,
50V, 0603 Murata GRM188R71H472KA01D
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 0.9µH HCV1206 Inductor Cooper HCV1206‑R90‑R
1PCB
PI37xx‑xx
Edge Connector
Eval Board
VICOR PCB0175rD
1PI3741 ZVS Buck‑Boost Low Voltage ZVS
B‑B SIP 10 x 14mm VICOR PI3741‑0x‑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 for
PI3741‑ 00
Resistor, 1%,
0.1W, 0603 Yageo RC0603FR‑0714KL
29.1kΩ for
PI3741‑ 01
Resistor, 1%,
0.1W, 0603 KOA Speer RN73H1JT TD2912F50
1REA4 1.07kΩ Resistor, 1%,
0.1W, 0603 Yageo RC0603FR‑071K07L
1RGP 49.9Ω Resistor, 1%,
0.1W, 0603 Rohm MCR03ERTF49R9
1RIN 0.51Ω Resistor, 1%,
0.25W, 1206 Rohm MCR18EZHFLR510
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
1CVDR 0.1µ F
Capacitor, X7R
Ceramic, 0.1µF,
50V, 0603
Rohm MCH185CN104KK
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 test points, 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
1 C6 Capacitor, Ceramic, 1206
1 H1 Factory Test Header

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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
VDIFFA11
VS1K4
EAIN A12
VSPA10
VSNA9
COMP
A8
SYNCO
C1
SCL
A3
ADDR0
A2 ADDR1
A1
SDA
A4
TRK
A6
SGND
B14
EAO
A13
VDR
E1
VS1K5
VOUT J14 VOUT K13
VIN
J1
PGD
D1
VIN
H1
PGND
K7
VIN
K1
VS2K10
VIN
K2
VIN
G1
VOUT H14
VOUT G14
PGND K8
VOUT K14
VS2K11
IMON A14
IS+E14
IS-D14
PI3741
CTRK
CCOMP
CEAO
RPGD
ADDRO/FT2 ADDR1/FT1
CVDR
RSYNCI
C1 C2 C3 C4 C5 C7 C8 C9 C10C11C12
1
J2
1
J3
1
J1
1
J4
PGND VINVOUT
VIN_FILT RSENSE
IMON
DNP R1 DNP
R3
DNP R2 DNP
R4
ADDR1
ADDR0
VDR
IMON
JVIN
JVOUT
VSP
VDIFF VSN VSP
C6
ISN
C13C14
DNP
RIMON
RIN
ISP
Tie
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
VSN
VDIFF
RDIFF1 RDIFF2
REA1 REA4
RGP
JGP
CEAIN1
DNP
EXT_VREF
REA3
DNP
REA2
DAC
PCBNumber
DNP RZ2
RZ1
VSP
IMON
Jumper J5 to connect IMON to VP for ATE Tesng.
DNP CIN2
J6
SGNDENABLE
VSUPPLY
FP0404R1 L1
CIN1
Tie
A1
1
GND
2
A2
3Y2 4
VCC5
Y1 6
U1 NC7WZ14
23
D1A
14
D1B
R5
VDR
4 12
3
TOP VIEW
DUAL LEDORIENTATION
PGD
PCBNumbe
r
12
MECH PIN
3
HCV1206-R
LMAG
F1 F2
Fiducials
PCB0203
-VO SENSE 1 + VO SENSE 1
SGND 1
EN 2
SDA3
SCL4
H1
Factory Test Header
J5
SGND
RSCLRSDA
Figure 1
Evaluation board schematic

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Typical Connections
Figure 4 illustrates the typical input supply and output load connections required to power the PI3741‑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.
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:305 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:305 Page 6
Figure 7
Schematic of edge connector
PAD Definitions
Schematic Symbol
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 Factory use only
5 SCL Factory use only
9 ADR1 Factory use only
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 Factory use only
22 VDR Internal generated 5.1V supply for gate drivers and internal logic
23 ISN Remote‑sensed output voltage, after the IMON resistor
24 VIN Input supply voltage measured at SiP’s input

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Table 4
Design files Product Deisgn
File Format Link to Download
PI3741‑0x‑EVAL1 ODB++ PI3741‑0x Eval ODB++.zip
PCB Design Files
ODB++ evaluation board design files are available for download on the Vicor website.

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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
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10/18 Rev 1.1 Page 8
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