DCM4623TC8G16F0T00 [VICOR]
Analog Control 3623 and 4623 ChiP DCMs Evaluation Board;
| 型号： | DCM4623TC8G16F0T00 |
| 厂家： | 
VICOR CORPORATION |
| 描述： | Analog Control 3623 and 4623 ChiP DCMs Evaluation Board |
| 文件： | 总17页 (文件大小：542K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
USER GUIDE | UG:017
Analog Control 3623 and 4623 ChiP DCMs
Evaluation Board
Arthur Russell
VI Chip® Applications Engineering
October 2014
Contents
Page
Introduction
Introduction
1
3
3
4
4
6
The Analog Control 3623 and 4623 ChiP DCM evaluation boards described in this document are
designed to be used with the DCM family of isolated, DC-DC converters. The 3623 DCM board is used
for the analog control, low input voltage 3623 ChiP products, while the 4623 DCM board is used for
the analog control, high input voltage (offline) 4623 ChiP products.
Contents
Features
Board Description
General Components
Test Points Description
The DCM evaluation board can be configured for various enabling and fault monitoring schemes,
as well as to exercise various modes of trimming, depending on the application requirements. The
evaluation board can be used to evaluate DCMs in either a stand-alone configuration, or as an
array of modules.
Schematic, Assembly Drawing
and Bill of Materials
7
Enable options:
Recommended Test
1. On-board mechanical switch (default)
Equipment
Basic Connections
Board Operation Details
Trim Control
14
14
14
15
15
16
16
2. External control
Trim options:
1. Fixed trim operation (default): the TR pin is permitted to float at initial startup.
Fault Monitoring
Chassis Ground
Paralleling
The DCM disables output trimming and the output trim is programmed to the nominal rated VOUT
.
2. Variable trim operation, on-board variable resistor: The trim pin voltage is ratiometric,
with a rheostat working against a pull-up resistor inside the DCM to VCC.
3. Variable trim operation, off-board control: The trim pin voltage is controlled via external
programming control, which is referenced to the –IN of each specific DCM in the system.
Fault monitor options:
1. On-board LED: the FT pin drives a visible LED for visual feedback on fault status.
2. On-board optocoupler: the FT pin drives an on-board optocoupler to bring
fault status across the primary-secondary isolation boundary.
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IMPORTANT NOTICE:
Hazardous voltages are present on the DCM Evaluation Board under power.
PERSONAL CONTACT WITH LINE VOLTAGE MAY RESULT IN SEVERE INJURY, DISABILITY, OR
DEATH. IMPROPER OR UNSAFE HANDLING OF THIS BOARD MAY RESULT IN SERIOUS INJURY
OR DEATH.
Read the precautions below entirely BEFORE using the DCM Evaluation Board. Do not operate the
evaluation board unless you have the appropriate safety precautions in place on your bench to
guarantee safety.
The list below is not comprehensive and is not a substitute for common sense and
good practice.
ꢀnDuring operation, the power devices and surrounding structures can be operated
safely at high temperatures.
ꢀnRemove power and use caution when connecting and disconnecting test probes
and interface lines to avoid inadvertent short circuits and contact with hot surfaces.
ꢀnNever use a jumper in place of the fuse.
ꢀnWhen testing electronic products always use approved safety glasses. Follow good
laboratory practice and procedures.
ꢀnAvoid creating ground loops when making measurements of the isolated input
or output voltage.
ꢀnCare should be taken to protect the user from accidental contact when
under power.
ꢀnCare should be taken to avoid reversing polarities if connecting to the opposite
(solder) side of the board.
ꢀnThe product evaluation boards described in this document are designed for
general laboratory evaluation, and are not suitable for installation in
end user equipment.
ꢀnRefer to the specific DCM module data sheet for electrical, thermal, and mechanical
product details
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These boards provide a convenient way to evaluate/demonstrate the performance of Vicor’s DCM
products. Kelvin connections are provided for accurate voltage measurements on power nodes. Sockets
are provided to permit quick installation and changing of bulk filtering capacitors. The evaluation board
also provides lugs for input/output connections, test points and sockets for easy connection to standard
test-equipment, and a high performance air cooled heatsink assembly.
Contents
The evaluation board arrives with the following contents:
ꢀn1 x DCM evaluation board
ꢀn1 x top and belly heatsink assembly (pre-installed)
ꢀn1 x hardware kit
Features
The DCM evaluation board has the following features:
1. Input and output lugs for source and load connections
2. Input fuse (appropriately rated)
3. Basic input filtering, including sockets to add through-hole input aluminum-electrolytic capacitors
for additional source decoupling
Note: The filtering used in the eval board is for demonstration purposes only and might not be the optimal
solution for all applications. For optimal filter design for parallel array application, consult the datasheet of the
DCM in use and the online filter design tool at:
http://app2.vicorpower.com/filterDesign/intiFilter.do
4. Basic output filtering, including sockets to add through-hole output
aluminum-electrolytic capacitors
5. Toggle switch for enabling and disabling the DCM via the ENABLE pin
6. Trim control selection
a. Using potentiometer
b. Using external voltage source
c. Open, to disable trimming and latch the model nominal trim condition
7. Provisions to replace input and output differential mode inductors with wire loops,
for oscilloscope/shunt based current measurements
8. Oscilloscope probe jack for accurate, high frequency output voltage measurements
9. Dual paralleling connectors for ENABLE, TRIM, FAULT and SGND signal connections, for daisy
chaining control to other DCM evaluation boards in an array
10. Kelvin voltage test points for all power pins
11. Top and bottom heatsink assembly for the DCM
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Board Description
The following section provides a detailed description of the evaluation board components, test points
and sockets.
General Components
1. DCM (PS01)
2. Input lugs: Sized for #10 hardware. Use these for making connection to the input source.
This board does not contain reverse polarity protection. Check for proper polarity before
applying the power.
3. Input fuse (F01 & F02): Appropriately rated for the DCM model on the board.
4. Input filter: Ceramic input capacitors (C15-C22), filtering inductor (L01) and damping resistor
(R08) provide input filtering. Sockets (H01-H02, H03-H04) can be used for easy installation of
aluminum-electrolytic input capacitors. The 3623 board also adds H09-H10 for additional
input bypassing.
5. Enable / Disable switch (SW01): When actuator is in top position towards “ON” text on the board,
the ENABLE pin will be open and the DCM will be enabled. When actuator is in bottom position
towards “OFF” text on the board, the ENABLE pin will be connected to SGND and the DCM will be
disabled. When switch SW01 is ON, an external voltage source can control the ENABLE state.
6. Header-jumper for trim control (J09): Provides the option to enable the trim function to set the
DCM programmed trim value via either the on board trim rheostat or an external voltage source:
a. Using potentiometer (R26)
b. Using external voltage source.
7. Output lugs: Sized for #10 hardware. Use these lugs to connect the output directly to the load.
8. Output oscilloscope probe Jack (J01): Used for making accurate scope measurements of the output
voltage (e.g. ripple). The jack is directly compatible with many common passive voltage probes
models. Remove the grounding lead and insulating barrel of the probe and insert the probe tip and
barrel directly into the jack, ensuring that the probe tip seats in the center socket of the jack. To
avoid the risk of an inadvertent short circuit, do not attempt to install while power is applied.
9. Output filter: Output capacitor (C201), filtering inductor (L02) and damping resistors (R16-R17), and
ceramic output capacitors (C02-C05) provide output filtering. Sockets H05-H06, and H03-H04 can
be used for easy installation of aluminum-electrolytic output capacitors.
10. High side current sense wire loops: By depopulating the associated inductor and damping resistors,
all input or output currents can be passed through a wire loop or use with an oscilloscope current
probe. The wire loop is installed at the large pair of plated through-holes near the applicable
inductor location.
11. Dual paralleling wire-to-board connectors (J02 and J03): Used for bussing control signals and their
reference (ENABLE, SHARE, FAULT, and SGND) across board assemblies during parallel operation.
The connector style provides simple “strip and insert” use with 18 – 24 AWG solid wires. Once
inserted, a spring loaded barb retains each wire with no need for soldering. To release the wire,
insert a thin bladed tool (AVX 06-9276-7001-01-000 or similar) into the slot above each
wire entry point.
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Figure 1
3623 DCM evaluation
board photo, top side
Figure 2
4623 DCM evaluation
board photo, top side
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Test Points Description
Test nodes are labeled and include a SMT test point for attaching miniature probes, clips or hooks.
Table 1
Primary referred
Name
Description
test point descriptions
+IN_FUSED,
+IN_FILT,
–IN
Provide measurement testpoints for the input voltage to the board in various locations, rela-
tive to the –IN board lug. +IN_FUSED is taken after input fusing, +IN_FILT is taken after the
input filtering network.
Provide Kelvin connection to input pins of the DCM. Use these test points for measuring the
input voltage at the module, excluding errors due to finite connection resistance leading up
to the module.
+IN_DCM,
–IN_DCM
Testpoint for Signal Ground on the primary/input side of the isolation boundary. This is the
reference for all primary side control circuitry and all control pins of the DCM.
PRI_SG
EXT_EN
PRI_EN
EXT_TR
PRI_TR
PRI_FT
Testpoint to drive the ENABLE signal (relative to PRI_SG) using an external source.
Testpoint to measure the ENABLE signal (relative to PRI_SG).
Testpoint to drive the TRIM signal (relative to PRI_SG) using an external source.
Testpoint to measure the TRIM signal (relative to PRI_SG).
Testpoint to measure the FAULT signal (relative to PRI_SG).
Table 2
Secondary referred
Name
Description
test point descriptions
Output voltage test points provide Kelvin connection to output pin group of the DCM. Use
these test points for measuring the output voltage at the module, excluding voltage errors
due to finite connection resistance and the module output current.
+OUT_DCM,
–OUT_DCM
+OUT_DCM_SHNT, Provides measurement testpoints for the output voltage in various locations, relative to the
+OUT,
–OUT
–OUT board lug. +OUT_DCM_SHNT is taken before the output filtering, and +OUT is taken
at the +OUT board lug.
Testpoints for the +5V bias supply return, and for measuring the FT_SEC fault monitor out-
put.
SEC_SG
FT_SEC
+5 V
Testpoint to measure the FAULT signal relative to SEC_SG once it has passed through the
opto-coupler, if used. Bias power must be supplied to +5V for voltage output to appear here.
Testpoint to provide a bias voltage (relative to secondary ground) for the fault opto-coupler,
if used.
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Schematic, Assembly Drawing and Bill of Materials
Figure 3
3623 DCM evaluation board
schematic
1
3
3
1
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Schematic, Assembly Drawing and Bill of Materials (Cont.)
Figure 4
4623 DCM evaluation board
schematic
1
3
3
1
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Schematic, Assembly Drawing and Bill of Materials (Cont.)
Figure 5
3623 DCM evaluation board,
assembly drawing, top side
J108
TP4
J104
J106
R08
L02
L01
H03
H05 H07
R25
J01
H09
H01
S101
S102
S103
S104
R16
R17
PS01
R18
R118
R119
R120
C23
R19
R503
C201
C24
R504
R505
R20
C25
H04
HS02
H06 H08
H10
H02
HS01
J105
J107
R204
R207
L203
R205
FB1
L202
R202
R201
L201
SW01
R565
R56
R548
R566
R547
SW03
R554
J001
R206
L204
R521
R512
R522
U201
R203
TP07
R553
TP8
TP25
TP26
TP21
R208
R241
C500
R26
R14
R226
R230
R243
L210
R240
L211
R242
R550
R549
C501
C502
SW13
TP03
Q201
U500
R13
SW04
R551
C505
R532
R229
R225
R224
R228
U502
TP23
TP08
U01
R524
R526
R12
R21
U501
R530
R22
Q200
R32
R09
R227
R223
R527
D202
R23
R11
R525
C504
C206
R214
R124
J03
J02
J09
J10
J504
J204
TOP VIEW
Figure 6
4623 DCM evaluation board
assembly drawing, top side
J108
TP4
J104
J106
R08
L02
L01
H05 H07
H03
H01
R25
J01
S103
S104
S101
R16
R17
PS01
R18
R118
C23
R503
R19
R504
R20
R505
C201
R119
R120
C24
C25
S102
H02
H04
HS02
H06 H08
HS01
J105
J107
R204
R207
L203
R205
FB1
L202
R202
R201
L201
SW01
R565
R56
R548
R566
R547
SW03
J001
R206
L204
R521
R512
C500
R522
U201
R203
TP07
TP03
R554
R553
TP8
TP25
TP26
TP21
R208
R241
R26
R14
R226
R230
R243
L210
R240
L211
R242
R550
R549
C501
C502
SW13
Q201
U500
R13
SW04
R229
R225
R224
R228
U502
TP23
TP08
U01
R524
R526
R551
R12
R21
U501
C505
R532
R530
R527
R22
Q200
R32
R09
R227
R223
D202
R23
R11
R525
C504
C206
R214
R124
J03
J02
J09
J10
J504
J204
TOP VIEW
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Schematic, Assembly Drawing and Bill of Materials (Cont.)
Table 3
DCM evaluation board BOM,
components common
to all boards
Reference
Manufacturer
Part Number
Description
Manufacturer
Designator
Common Components
C01
C02 – C05
C07 – C14
C15 – C22
C201
CAP X7R 0.10µF 10% 16V 0603
AVX
0603YC104KAT2A
CAP X7S 4.7µF 10% 100V 1206
Board specific - See table 4 BOMs
Board specific - See table 4 BOMs
Design specific - See table 5 BOMs
LED RED 0805
AVX
12061Z475KAT2A
D01
ROHM
SML-211UTT86
FB1
FERRITE BEAD 33 OHM 6A 1206
Design specific - See table 5 BOMs
Board specific - See table 4 BOMs
CONN 4 POS WIRE TO BOARD
PCB TP ADAPTER, 3.5mm PROBE
Board specific - See table 4 BOMs
IND 0.33µH 20% 50A
MURATA
BLM31PG330SN1L
F01, F02
HS01 – HS02
J02 – J03
J01
AVX
009276004021106
131-5031-00
TESTPATH
L01
L02
WURTH
VISHAY
744309033
M02
IC 6 PIN OPTO
CNY17-3X017T
R02, R04, R05,
R18, R19, R20
RES 0 OHM JUMPER 0603
KOA
RK73Z1JTTD
PS01
R08
Design specific - See table 5 BOMs
RES 1 OHM ¼ W 5% 1206
VICOR
KOA
RK73B2BTTE1R0J
WSL2512R2500FEA
RK73B1JTTD102J
RK73H1JTTD4992F
CR0603E4991B-T5
RK73Z1JTTD
R16
RES 250 mOHM 1W 2512
VISHAY
KOA
R09, R21
R22, R32
R23
RES 1 KOHM 1/10W 5% 0603
RES 49.9 KOHM 1/10W 1% 0603
RES 4.99 KOHM 1/1W 0.1% 0603
RES 0 OHM JUMPER 0603
KOA
THIN FILM TECH
KOA
R24, R01
R25
RES 0 OHM JUMPER 2010
VISHAY
COPAL
CRCW20100000Z0EF
CT-94EW504
R26
RES TRIM POT 500 kOHM 1/2W 10%
RES 0 OHM JUMPER 1612 COPPER
S102 - S104
EXCELTOOL & DIE 29581
C&K COMPO-
SW01
SW TOGGLE SPDT 1 POS
JUMPER SOCKET XJ8A
GT11MSABE
NENTS
JMPSOK for
J09 – J10
OMRON
XJ8A-0211
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Schematic, Assembly Drawing and Bill of Materials: (Cont.)
Table 4a
BOM additions, components
common to all 3623 DCM
evaluation boards
Reference
Manufacturer
Part Number
Description
Manufacturer
Designator
3623 board components
C07, C09, C11,
CAP X7R 4700pF 10% 2kV 1210
KEMET
N/A
C1210C472KGRAC7800
N/A
C13
C08, C10, C12,
C14
N/A (not present in design)
C15 – C22
L01
CAP X7R 4.7µF 20% 100V 2220
IND 0.33µH 20% 50A
TDK
C5750X7R2A475M230KA
744309033
WURTH
VICOR
HS01 - HS02
S101
3623 DUAL HTSNK
40526
RES 0 OHM JUMPER 1612 COPPER
EXCELTOOL & DIE 29581
UNITED
CIN
@
CAP ALEL 680µF 20% 63V RADIAL
18 X 20
ELXZ630ELL681MM20S
H01 - H02
CHEMI CON
Table 4b
BOM additions, components
common to all 4623 DCM
evaluation boards
Reference
Manufacturer
Part Number
Description
Manufacturer
Designator
4623 board components
C07 – C14
CAP X7R 4700pF 10% 2kV 1210
KEMET
C1210C472KGRAC7800
C15 – C22
L01
CAP X7T 0.47µF 10% 630V 2220
IND 1.0µH 20% 13A
TDK
C5750X7T2J474K250KC
SRP7030-1R0FM
40519
BOURNS
VICOR
HS01 - HS02
S101
4623 DUAL HTSNK
BEAD 680 OHM 4A 1812
TAIYO YUDEN
FBMH4532HM681-T
CIN
@
UNITED
AP ALEL 10µ 20% 450V RAD
EKXG451ELL100MK20S
H01 - H02
CHEMI CON
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Schematic, Assembly Drawing and Bill of Materials: (Cont.)
Table 5
Example: BOM additions,
components which are
DCM model specific.
Reference
Manufacturer
Part Number
Description
Manufacturer
Designator
Evaluation board number: DCM3623E50M06A8M00
PS01
F01
DCM - 3623
VICOR
DCM3623T50M06A8M00
324 030P
FUSE 30A 125V AXIAL
LITTELFUSE
NICHICON
CAP ALEL 10000µF 20% 10V RADIAL
18 x 26.5
C201
URS1A103MHD1TN
Evaluation board number: DCM3623E50M13C2M00
PS01
F01
DCM - 3623
VICOR
DCM3623T50M13C2M00
324 030P
FUSE 30A 125V AXIAL
LITTELFUSE
CAP ALEL 4700µF 20% 25V RADIAL
16 x 25
C201
NICHICON
UVY1E472MHD
Evaluation board number: DCM3623E50M17C2M00
PS01
F02
DCM - 3623
VICOR
DCM3623T50M17C2M00
324 030P
FUSE 30A 125V AXIAL
LITTELFUSE
CAP ALEL 2200µF 20% 25V RADIAL
16 x 25
C201
NICHICON
UPW1E222MHD
Evaluation board numbers: DCM3623E50M26C2M00, DCM3623E50M31C2M00
One of
PS01
DCM - 3623
VICOR
DCM3623T50M26C2M00
DCM3623T50M31C2M00
F01
FUSE 30A 125V AXIAL
LITTELFUSE
324 030P
CAP ALEL 1000µF 20% 50V RADIAL
18 x 20
UNITED
C201
EKY-500ELL102MM20S
CHEMICON
Evaluation board number: DCM3623E50M53C2M00
PS01
F01
DCM - 3623
VICOR
DCM3623T50M53C2M00
324 030P
FUSE 30A 125V AXIAL
LITTELFUSE
CAP ALEL 220µF 20% 80V RADIAL
18 x 16.5
C201
NICHICON
UPJ1K221MHD6TN
Evaluation board numbers: DCM4623EC8G16F0T00, DCM4623ED2J13D0X00, DCM4623ED2H26F0X00
One of
DCM4623TC8G16F0T00
DCM4623TD2J13D0T00
PS01
DCM - 4623
VICOR
DCM4623TD2J13D0M00
DCM4623TD2H26F0T00
DCM4623TD2H26F0M00
COOPER
F01
FUSE 5A 450V FAST 6.3 X 32 RADIAL
BK/PCD-5-R
BUSSMANN
CAP ALEL 1000µF 20% 50V RADIAL
18 x 20
UNITED
C201
EKY-500ELL102MM20S
CHEMICON
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Schematic, Assembly Drawing and Bill of Materials: (Cont.)
Table 5 (Cont.)
Example: BOM additions,
components which are
DCM model specific.
Reference
Manufacturer
Part Number
Description
Manufacturer
Designator
Evaluation board numbers: DCM4623ED2H31E0X00, DCM4623ED2H53E0X00
One of
DCM4623TD2H31E0T00
DCM4623TD2H31E0M00
DCM4623TD2H53E0T00
DCM4623T02H53E0M00
PS01
DCM - 4623
VICOR
COOPER
F01
FUSE 5A 450V FAST 6.3 X 32 RADIAL
BK/PCD-5-R
BUSSMANN
CAP ALEL 220µF 20% 80V RADIAL
18 x 16.5
C201
NICHICON
UPJ1K221MHD6TN
General BOM rules for various DCM Evaluation Boards
ꢀnPS01: This is the Vicor DCM, whose part number is coded in the evaluation board part number.
For example, eval board DCM4623ED2K53E0M00 uses DCM4623TD2K53E0M00.
ꢀnF01: This is the input fuse. See the datas heet for the specific DCM for appropriate fuse needed to
meet listed safety agency approvals.
ꢀnC201: This is the external output capacitor for the DCM. It is an Aluminum electrolytic with value
that satisfies the DCM datasheet COUT-TRANS minimum.
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Recommended Test Equipment
The following is a list of recommended test equipment.
1. Safety glasses
2. DC power supply: Refer to the specific DCM model datasheet to ensure the supply has
sufficient power and current capability, especially at low line, to satisfy current inrush when the
DCM is started
3. Electronic load: Refer to the specific DCM model datasheet to ensure the load has sufficient power
handling and current capability for testing
4. Cooling fan
5. Digital multi-meters (DMMs)
6. Oscilloscope and probes
7. Function generator
8. Auxiliary bench voltage supply (optional, for bias of secondary side fault monitor opto-coupler)
9. Interconnect wires, cables and fastening hardware
10. Calibrated input and output shunts, appropriately rated
11. Thin bladed tool for extracting wires from paralleling connectors
(AVX 06-9276-7001-01-000 or similar)
Basic Connections
ꢀnConfirm bench equipment is powered off.
ꢀnConnect the input DC power supply positive lead to the +IN input lug of the evaluation board,
connect the input power supply negative lead to the –IN input lug of the evaluation board.
ꢀnConnect the CHASSIS_GROUND lug of the evaluation board to a safety “green wire” earth ground.
ꢀnConnect the +OUT lug of the evaluation board to the electronic load positive input, connect the
–OUT lug of the evaluation board to the electronic load negative input.
ꢀnDirect airflow from the cooling fan through the DCM heatsink fins.
ꢀnHave the latest DCM datasheet on hand for reference.
Board Operation Details
ꢀnSW01 provides control over enable.
ꢀnIn the “OFF” position, the switch will connect SG the EN net, which disables the DCM.
ꢀnIn the “ON” position, SG is disconnected from the EN net.
ꢀnExternal connection to EN is permitted using the PRI_EN testpoint. SW01 should be set to “ON” to
permit external control.
ꢀnThe J02 & J03 paralleling connectors can be used to connect EN nets across different boards.
Note: to enable the DCMs in a parallel array, all boards need SW01 set to “ON” to avoid pulling the
EN node low.
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Trim Control
ꢀnJumper block J09 configures trimming.
ꢀnWith no jumpers installed, neither the trim potentiometer nor the test point for external trim con-
trol is connected to the TR net. Note that the paralleling connectors always connect to the TR net.
ꢀnWith a jumper loaded across J09.1 and J09.2, the trim potentiometer R26 is
connected as a rheostat between the TR node and SG.
ꢀnWith a jumper loaded across J09.3 and J09.4, the external trim test point is
connected to the TR node.
ꢀnThe DCM contains an internal pull-up resistor to VCC (3.3V nominal). When VIN is applied to the DCM
it samples the TR node voltage. If it has pulled up to VCC, the DCM disables trimming as long as it
has input power, and the programmed trim condition will be nominal rated VOUT of the DCM model.
ꢀnIf the TR node is not permitted to pull-up to VCC when VIN is applied, trimming is enabled for as long
as the DCM has input power.
ꢀnNote: Any load on the TR node may cause the DCM to select trim mode when VIN is applied,
including: the external trim testpoint (if selected with the jumper block), the trim potentiometer
(if selected with the jumper block), and other DCM evaluation boards attached to the
paralleling connectors.
ꢀnThe trim potentiometer adds a variable resistance between the TR node and SG, from between
0Ω nominal, to the value of the potentiometer (500kΩ). This resistance range will generate TR pin
voltages which cover the entire functional range of the TR pin. Care should be taken to ensure the
programmed trim condition is within the rated trim range of the DCM in order for the DCM to meet
specifications.
ꢀnIn a parallel setup using the J02 & J03 paralleling connectors, all boards besides the top one should
have the trim jumper select block at J09 open.
ꢀnIn a parallel setup with multiple DCM evaluation boards, each DCM contributes another internal
pull-up resistor to a 3.3V nominal rail. With any resistive based trimming of the TR node, the resultant
trim condition will be modified by the number of DCMs which are attached and have VIN applied.
Conversely with a voltage source applied to the TR node, adding additional DCMs to the system has
minimal impact on the resultant trim condition.
Fault Monitoring
ꢀnJumper block J10 configures how the FT node is monitored.
ꢀnWith no jumpers installed, neither the visible LED nor the opto-coupler is connected to the FT net.
Note that the paralleling connectors always connect to the FT net.
ꢀnWith a jumper loaded across J10.3 and J10.4, the visible LED at D01 and its bias resistor network
R09 & R32 are connected to the FT node.
ꢀnWith a jumper loaded across J10.1 and J10.2, the opto-coupler at M02 and its bias resistor net-
work R21 & R22 is connected to the FT node.
ꢀnThe DCM FT output is intended to be directly paralleled with the FT output of other DCMs in an array.
The FT node in an array forms a “wired-OR”, where any DCM can drive the FT node high.
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ꢀnBoth the visible LED and the opco-coupler draw current from the FT node in a fault condition. The FT
pin on the DCM has limited drive-high capabilities, and so care must be taken to avoid excess loading
of the pin. To avoid overload, do not configure J10 to use both the LED and opto-coupler indicators
simultaneously. When connecting external circuitry or test equipment to the FT test point, ensure that
the maximum load on the FT node is within the DCM datasheet ratings.
ꢀnIn a parallel setup using the J02 & J03 paralleling connectors, all boards besides the top one should
have the fault jumper select block at J10 open.
ꢀnWhen using the opto-coupler, the status of the FT node can be easily transferred to the secondary side
of the DCM(s) isolation boundary. To resolve the fault state on the secondary side, the collector side
of the opto requires a bias voltage. A 5V bench supply should be connected between the “+5V” and
“SEC_SG” testpoints. With no fault present, “FT_SEC” will be at 0V, and when a fault occurs and the
opto-coupler is active, “FT_SEC” will pull up to 5V, relative to SEC_SG.
Chassis Ground
The heatsink assembly of the DCM is connected to the CHASSIS_GND node of the board, as well as the
y-caps from each power connection of the DCM. A connection from the CHASSIS_GND lug to earth
ground is required.
Paralleling
The paralleling and sharing performance of multiple DCMs can be easily demonstrated by stacking
multiple evaluation boards and interconnecting the inputs and outputs with standoffs to create a
parallel array. The DCM uses a negative load-line to implement wireless droop-sharing in an array. Each
DCM in an array operates in the same way as it does as a stand-alone unit. With equal trim conditions,
the load is effectively shared across multiple DCMs. Mismatches in this case are modest, and are further
canceled by an effective negative voltage vs. temperature coefficient. See the DCM datasheet for more
detail on load line and tempco. DCMs in an array require no derating of maximum output power or
current.
DCMs in an array with mismatched trim conditions will not share the load equally at light- to
moderate-load conditions. As the load increases, one or more DCMs (starting with those with the
highest programmed output trim voltage) will go into current limit and their contribution to the overall
output current will plateau. For DCMs, current limit is not a fault condition, rather it is a valid constant-
current mode of operation and a DCM in current limit will provide constant current to the load. As long
as the load does not exceed the maximum load rating of the array of DCMs, the output voltage will
continue to be regulated by any remaining DCMs still in constant voltage mode. Even with mismatched
trim conditions, the array can be safely loaded up to the full rated array capacity.
The following connections and settings should be used for an array of DCM evaluation boards:
ꢀnAll DCMs in a parallel array must be the same model.
ꢀnThe boards should be physically stacked using metal standoffs at the +IN & –IN lugs, the +OUT &
–OUT lugs, and the CHASSIS_GND lug. This also connects these nodes electrically so that a single
source, single load, and earth ground connection can be made to the system.
ꢀnThe +IN lugs are not required to be connected together for an array of DCMs. The wireless
sharing does not require the same differential input voltage be present on all DCMs in the array.
In some applications dissimilar input voltages may be needed, which is fully supported.
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ꢀnThe –IN lugs must be connected together if the paralleling connector is used, or if the EN, TR,
or FT pins are interconnected in any fashion. However if all control signals of all DCMs are fully
isolated from one another, then both the +IN and –IN lugs can remain independent across the
evaluation boards, and the DCMs can be operated with fully independent input supplies.
ꢀnStandoffs must be sufficient in length to avoid contact between boards, and to permit airflow to
all DCMs in the system.
ꢀnIf coordinated enable control, trimming or fault monitoring is desired, then the paralleling connectors
J09 & J10 can be used to easily interconnect the PRI_FT, PRI_EN, PRI_TR_ and PRI_FT
nodes across boards.
The paralleling connectors at J02 & J03 can be used for coordinated enable and trim control and fault
monitoring. The enable, trim and fault monitor features of the top most board should be used for
convenience, while the remaining boards should have their jumper blocks depopulated and enable
switches set to enable.
The paralleling wire-to-board connectors (at J02 and J03) are provided to daisy chain control signals and
PRI_SG, with a simple strip and insert option. They will accept 18 – 24 AWG solid wires.
Figure 7
DCM evaluation boards stacked
to form a high power parallel
array, using common -IN and
the paralleling connectors.
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.
Rev 1.6
04/17
vicorpower.com
Applications Engineering: 800 927.9474
Page 17
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