PI3749-00 Eval Board User Guide 16 to 34 VIN, 24 VOUT

USER GUIDE | UG:303
PI3749-00 Eval Board User Guide
16 to 34 VIN, 24 VOUT, 200 W
Cool-Power ZVS Buck-Boost
ContentsPage
Introduction1
Bill of Materials
2
Schematic3
Typical Connections
4
Connector Descriptions 5
PCB Metal Layers
7
Introduction
The PI3749-00 Eval1 evaluation board demonstrates the features and benefits of
Picor’s ZVS Buck-Boost regulator; pre-configured for a 24 VOUT voltage and rated for
over 200 W of continuous power up to 85°C tAMB. Please refer to the PI3749-00's data
sheet for all power specifications.
The evaluation board provides several options for applying input power (VSUPPLY 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 PI3749-00’s features accessible to the user.
The current monitor function (IMON) is set-up to monitor the PI3749-00’s output current,
sensed across a 5 mΩ resistor. The general purpose amplifier (VDIFF) comes pre-set
with a gain of 2, but can be easily re-configured 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 FLT 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 10k 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 was designed with an edge connector to
facilitate testing, 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 0f 0.062".
Figure 1.
PI3749-00-EVAL1
Evaluation Board
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Bill of Materials
Table 1.
Qty
Bill of Materials
Populated Components
14
Designator
Value
C1, C2, C3, C4, C5,
10 uF
Description
C7, C8, C9, C10,
Ceramic Cap, X5R,
C11, C12, C13, C14,
50V, 1206
Vendor
Name
Vendor Part Number
TDK
C3216X5R1H106K160AB
Murata
GRM319R71H104KA01D
Murata
GRM188R71H472KA01D
TDK
CGA3E3X7S2A104K080AB
Rohm
SML-P24MUWT86
CIN1
1
C6
0.1 uF
1
CCOMP
4.7 nF
Ceramic Cap, X7R,
50 V, 1206
Ceramic Cap, X7R,
50 V, 0603
1
CVDR
0.1 uF
1
D1
Fault Status
2
FT1, FT2
TEST 1, TEST 2
2
J5, J6
Ceramic Cap, X7S,
100 V, 0603
1 x 1 mm Dual Color SM
LED
SM Testpoint
Keystone
5015
0.1” Header Jumper
Samtec
TSW-148-07-F-S
1
L1
65nH
FP0404 Series Inductor
Cooper
FP0404R1-R065-R
1
LMAG
480nH
HCV1206 Inductor
Cooper
HCV1206-R48-R
1
PCB
PICOR
PCB0175rA
1
PI3749
PICOR
PI3749-00-LGIZ
PI3749-XX Edge Connector
Eval Board
ZVS Buck-Boost
Low Voltage ZVS B-B SIP
10 x 14 mm
1
5
R5
RDIFF1, RDIFF2,
REA3, RFLT, RSYNCI
1.00k
Resistor, 1%, 0.1 W, 0603
Rohm
MCR03EZPFX1001
10.0K
Resistor, 1%, 0.1 W, 0603
Rohm
MCR03EZPFX1002
1
REA1
14.0K
Resistor, 1%, 0.1 W, 0603
Yageo
RC0603FR-0714KL
1
REA4
1.07K
Resistor, 1%, 0.1W, 0603
Yageo
RC0603FR-071K07L
1
RGP
49.9
Resistor, 1%, 0.1 W, 0603
Rohm
MCR03ERTF49R9
1
RIN
1
Resistor, 1%, 0.25 W, 1206
Rohm
MCR18ERTFL1R00
1
RSENSE
.005
Resistor, 1%, 1 W, 2512
Panasonic
ERJ-M1WSF5M0U
1
RZ1
0
Resistor, 1%, 0.1 W, 0603
Rohm
MCR03EZPJ000
Fairchild
NC7WZ14EP6X
1
U1
NC7WZ14EP6X
Dual Schmidt trigger
Inverter
Non-Populated Components
Table 2.
Bill of Material
Non-Populated Components
Qty
Designator
Description
3
REA2, RIMON, RZ2
Resistor, 1%, 0.1 W, 0603
4
R1, R2, R3, R4
Factory Use Only
14
EAO, EXT_VREF, FLT, IMON, SGND1, SGND2, SS/
TRK, SYNCI, SYNCO, VDIFF, VDR, VIN, VSN, VSP
Thru-hole Testpoints, Vector K24C
3
CEAIN1, CEAO, CTRK
Ceramic Cap, 50 V, 0603
1
CIN2
Bi-Polar Capacitor, Nichicon UPW2A330MPD or equivalent
1
JVIN
Johnson Jack, Tektronix 131503100
3
ENABLE, FT3, FT4
SM Testpoint, Keystone 5015
1
JGP
0.1” Header Jumper
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Figure 2.
Evaluation Board
Schematic
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Figure 3.
Evaluation Board Details
Typical Connections
Figure 4 illustrates the typical input supply and output load connections required to
power the PI3749-00 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 could be
used to measure input ripple voltage.
Figure 4.
Typical Input and Output
Connections.
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PICOR 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”
Figure 5.
Edge Connector Details
PAD Numbering
Figure 6.
Top (Component) View
Figure 7.
Bottom View
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Schematic Symbol
PAD Definitions
PAD
NAME
Description
P1,P2
PGND
Power ground connection for the input supply and output load.
P3
VOUT
Output voltage connection
P4
VSUPPLY
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
SIP enable
4
FT4
TEST 4, Factory use only
5
FT3
TEST 3, Factory use only
9
FT1
TEST 1, 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
FLT
SIP fault status pin
21
FT2
TEST 2, Factory use only
22
VDR
SIP’s (internal or external) VDR voltage supply
23
ISN
Remote sensed output voltage, after the IMON resistor
24
VIN
Input supply voltage measured at SIP’s input
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PCB Artwork
The Power Behind Performance
Rev 1.1a 08/15
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