Using the UCD3138PSFBEVM-027
User's Guide
Literature Number: SLUUAK4
August 2013
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WARNING
Always follow TI’s set-up and application instructions, including use of all interface components within their
recommended electrical rated voltage and power limits. Always use electrical safety precautions to help
ensure your personal safety and the safety of those working around you. Contact TI’s Product Information
Center http://support/ti./com for further information.
Save all warnings and instructions for future reference.
Failure to follow warnings and instructions may result in personal injury, property damage, or
death due to electrical shock and/or burn hazards.
The term TI HV EVM refers to an electronic device typically provided as an open framed, unenclosed
printed circuit board assembly. It is intended strictly for use in development laboratory environments,
solely for qualified professional users having training, expertise, and knowledge of electrical safety risks in
development and application of high-voltage electrical circuits. Any other use and/or application are strictly
prohibited by Texas Instruments. If you are not suitably qualified, you should immediately stop from further
use of the HV EVM.
1. Work Area Safety:
(a) Keep work area clean and orderly.
(b) Qualified observer(s) must be present anytime circuits are energized.
(c) Effective barriers and signage must be present in the area where the TI HV EVM and its interface
electronics are energized, indicating operation of accessible high voltages may be present, for the
purpose of protecting inadvertent access.
(d) All interface circuits, power supplies, evaluation modules, instruments, meters, scopes and other
related apparatus used in a development environment exceeding 50 V
electrically located within a protected Emergency Power Off (EPO) protected power strip.
(e) Use a stable and non-conductive work surface.
(f) Use adequately insulated clamps and wires to attach measurement probes and instruments. No
freehand testing whenever possible.
2. Electrical Safety:
(a) De-energize the TI HV EVM and all its inputs, outputs, and electrical loads before performing any
electrical or other diagnostic measurements. Revalidate that TI HV EVM power has been safely deenergized.
(b) With the EVM confirmed de-energized, proceed with required electrical circuit configurations, wiring,
measurement equipment hook-ups and other application needs, while still assuming the EVM circuit
and measuring instruments are electrically live.
(c) Once EVM readiness is complete, energize the EVM as intended.
/75 VDC must be
RMS
WARNING: while the EVM is energized, never touch the EVM or its electrical circuits as they
could be at high voltages capable of causing electrical shock hazard.
3. Personal Safety:
(a) Wear personal protective equipment e.g. latex gloves and/or safety glasses with side shields or
protect EVM in an adequate lucent plastic box with interlocks from accidental touch.
4. Limitation for Safe Use:
(a) EVMs are not to be used as all or part of a production unit.
Fusion Digital Power is a trademark of Texas Instruments.
2
Copyright © 2013, Texas Instruments Incorporated
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SLUUAK4–August 2013
1 Introduction
This evaluation model (EVM), the UCD3138PSFBEVM-027, is used to evaluate the UCD3138 64-pin
digital control IC in an off-line power-converter application and then to aid in its design. The EVM is a
standalone phase-shifted full-bridge DC-DC power converter. The EVM is used together with a control
card, the UCD3138CC64EVM-030, which is an EVM placed on the UCD3138RGC.
The UCD3138PSFBEVM-027, together with the UCD3138CC64EVM-030, evaluates a phase-shifted fullbridge DC-DC converter. Each EVM is delivered without requiring additional work, from either hardware or
firmware. This EVM combination allows for some of the design parameters to be retuned using Texas
Instruments' graphical user interface (GUI) based tool, Fusion Digital Power™ Designer. Loading custom
firmware with user-designed definition and development is also possible.
Three EVMs are included in the kit: the UCD3138PSFBEVM-027, UCD3138CC64EVM-030, and USB-TOGPIO.
This user’s guide provides basic evaluation instruction with a focus on system operation in a standalone
phase-shifted full-bridge DC-DC power converter.
User's Guide
SLUUAK4–August 2013
Using the UCD3138PSFBEVM-027
WARNING
High voltages are present on this evaluation module during
operation and for a a time period after power off. This module
should only be tested by skilled personnel in a controlled
laboratory environment.
An isolated DC voltage source meeting IEC61010 reinforced
insulation standards is recommended for evaluating this EVM.
High temperature exceeding 60°C may be found during EVM
operation and for a time period after power off.
The purpose of this EVM is to facilitate the evaluation of digital
control in a phase-shifted full-bridge DC-DC converter using the
UCD3138, and cannot be tested and treated as a final product.
Extreme caution should be taken to eliminate the possibility of
electric shock and heat burn. Please refer to the page Evaluation
Module Electrical Safety Guideline after the cover page for your
safety concerns and precautions.
Read and understand this user’s guide thoroughly before starting
any physical evaluation.
SLUUAK4–August 2013 Using the UCD3138PSFBEVM-027
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Copyright © 2013, Texas Instruments Incorporated
3
Description
2 Description
The UCD3138PSFBEVM-027, along with the UCD3138CC64EVM-030, demonstrates a phase-shifted fullbridge DC-DC power converter with digital control using the UCD3138 device. The UCD3138 device is
located on the UCD3138CC64EVM-030 board. The UCD3138CC64EVM-030 is a daughter-card with
preloaded firmware providing the required control functions for an phase-shifted full-bridge converter.
Please contact TI for details on the firmware. The UCD3138PSFBEVM-027 accepts a DC input from 370
to 400 VDC, and outputs a typical 12 VDC with full-load output power at 360 W, or full output current of 30
A.
NOTE: This EVM does not have an input fuse. It relies on the input current limit from the input
voltage source that is used.
2.1 Typical Applications
• Offline DC-DC power conversions
• Servers
• Telecommunication systems
2.2 Features
• Digitally-controlled phase-shifted full-bridge DC-DC power conversion
• DC input from 370 to 400 VDC
• 12-VDC regulated output from no load to full load
• Full-load power at 360 W, or full-load current at 30 A
• High efficiency
• Constant soft-start time
• Overvoltage, overcurrent, and brownout protection
• Test points to facilitate device and topology evaluation
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Using the UCD3138PSFBEVM-027 SLUUAK4–August 2013
Copyright © 2013, Texas Instruments Incorporated
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3 Performance Specifications
Performance Specifications
Table 1. UCD3138PSFBEVM-027 Performance Specifications
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input Characteristics
Voltage operation
range
370 400 VDC
Input UVLO On 350 VDC
Input UVLO Off 330 VDC
Input = 370 VDC, full load = 30 A 1.2
Input current Input = 385 VDC, full load = 30 A 1.1 A
Input = 400 VDC, full load = 30 A 1
Output Characteristics
Output voltage, VOUT No load to full load 12 VDC
Output over voltage 13.5 VDC
Output load current,
(1)
IOUT
370 to 400 VDC 30 A
Output voltage ripple 385 VDC and full load = 30 A 90 mVpp
Output over current 30 A
Systems Characteristics
Switching frequency 140 kHz
Peak efficiency 385 VDC, full load = 30 A 93.5 %
Full-load efficiency 385 VDC, load = 30 A 93.5 %
Operating
temperature
400-LFM forced air flow cooling 25 °C
Firmware
Device ID (Version) UCD3100ISO1 | 0.0.01.0001|130315
Filename UCD3138PSFBPWR027_03152013.x0
(1)
The load current and load power are commanded using the designer GUI. See Section 12 for more information on CPCC
operation. See Section 13 for more information on GUI application.
SLUUAK4–August 2013 Using the UCD3138PSFBEVM-027
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5
Auxiliary Bias Supply
Isolation Boundary
Secondary
Primary Current Sense
Current Doubler Rectifier and Filter
ORing Control
+400-V Input
400-V Return
+12-V Output
12-V Return
30A
Primary
External Slope Compensation
1:1:1
1:1:1
DPWM3B
DPWM3A
DPWM2A
DPWM2B
1
1
1
1
1
1
1
1
1
1
1
Parts not populated
2
2
1
R54
15.0
R55
15.0
R27
1.00
R25
1.00
C1
47 Fµ
C2
47 Fµ
C3
47 Fµ
C7
1nF
C23
220pF
R43
1.00
C14
10nF
C15
10 Fµ
TP1
TP2
TP15
TP16
TP3
R31
3.32k
TP24
TP4
TP6
TP5
TP7
R24
10.0k
R26
10.0k
TP17
TP14
R39
10.0k
R42
10.0k
R41
100k
TP12
R38
549
R37
10.0k
C11
10nF
C20
100pF
TP25
TP21
TP20
TP22
TP8
TP33
TP36
TP34
TP35
TP19
D6
MBRS1100
D7
C19
10nF
R21
15.0k
TP32
TP23
R20
15.0k
C59
D21
STPS130A
D24
STPS130A
D25
D19
STPS130A
D18
BAV70-V
D16
TP26
TP27
TP28
TP29
R1
5.11k
R3
5.11k
R8
5.11k
R10
5.11k
C36
0.1 Fµ
C28
0.1 Fµ
R5
100
R34
100
C25
1 Fµ
C56
0.1uF
C58
0.1 Fµ
C16
4700pF
1
ENBA
2
INA
3
GND
4
INB
5
OUTB
6
VDD
7
OUTA
8
ENBB
9
PWPD
U5
UCC27424DGN
1
ENBA
2
INA
3
GND
4
INB
5
OUTB
6
VDD
7
OUTA
8
ENBB
9
PWPD
U4
UCC27424DGN
C18
1 Fµ
QT1
QB1
QT2
QB2
2
3
1
4
T2
80mH
L2
22 Hµ
1
VDD
2
RSET
3
STAT
4
FLTB
5
OV
6
UV
7
GND
8
GATE
9
RSVD
10
C
11
A
12
FLTR
13
BYP
14
PG
U1
TPS2411PW
1
VIN+
2
VAUX_P
3
-VAUX_-VIN
4
-VIN
5
GND
6
VIN_MONITOR
7
VAUX_S
U6
PWR050
C61
4700pF
C50
4700pF
D27
D8
D20
D17
BAV70-V
D23
BAV70-V
D22
BAV70-V
D5
MBRS1100
R11
51.1
R12
51.1
C21
100pF
L1
2.2 Hµ
1
ENBA
2
INA
3
GND
4
INB
5
OUTB
6
VDD
7
OUTA
8
ENBB
9
PWPD
U3
UCC27424DGN
C22
0.1 Fµ
C5
1nF
C6
4700pF
C12
10nF
C71
100pF
C8
100pF
R103
5.11k
R44
R45
100k
R22
0.5
R23
2.49k
R28
150
R29
C17
100pF
R17
36.5k
R30
0
C24
Q4
Q1
1
2
3
J2
C44
1.5 Fµ
+
C66
47µF
R51
1.21k
R52
1.21k
R49
1.21k
R50
1.21k
R32
0
R19
0
R4
2.43
R2
2.43
R35
2.43
R9
2.43
R6
7.50
R7
7.50
R36
7.50
R46
7.50
1
2
5
6
9
10
T4
1
2
5
6
9
10
T3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
P3
Q10
SI7866ADP
Q6
SI7866ADP
1 2
HS1
1 2
HS2
1 2
HS3
1 2
HS4
1
6
7
8
9
10
11
12
T1
R47
1.00
R48
10.0k
1
ENBA
2
INA
3
GND
4
INB
5
OUTB
6
VDD
7
OUTA
8
ENBB
9
PWPD
U8
UCC27424DGN
C55
0.1 Fµ
R66
10.0k
R70
1.00
C63
47 Fµ
2
3
1
4
T5
D12
BAT54S
D14
BAT54S
R71
150
R72
C64
220pF
TP9
R73
C65
0.1 Fµ
C60
C13
4.7 Fµ
C43
0.1 Fµ
C53
0.1uF
C54
0.1 Fµ
Q2
Q8
R77
2.05k
R78
1.24k
D9
D1
MMBD914
D10
J8
R40
10.0
R87
R88
10.0k
R90
10.0k
1
IN
2
NC
3
NC
4
GND
5
FB/NC
6
NC
7
NC
8
OUT
9
PWPD
U9
TPS715A33
C9
0.1uF
C10
0.1 Fµ
QSYN1
QSYN2
QSYN3
QSYN4
+
C4
1000 Fµ
+
C62
1000 Fµ
C46
2200pF
R91
220
C67
330pF
J9
J1
J11
J10
J4
J3
R93
1.0k
R100
1.0k
R105
0.003
R104
0.003
R53
0.003
DPWM1B
-RS
+RS
VAUXS
VINSCALED
AD_06
I_PRI
VAUXPRI
+VIN
VAUXS
AGND
IS-
BUS_ITRAN
BUS_ITRAN
GPIO/ORING_CTRL
+VO
+VO1
+RS
-RS
AD_02/I_SHARE
+VIN
+VIN
3.3V_EXT
BUS+
BUS+
VAUXS
VAUXS
OVP_LATCH
DPWM3A
VAUXS
DPWM3B
OVP_LATCH
DPWM2B
VAUXS
DPWM2A
EAP2
3.3V_EXT
I_PRI
AGND
DPWM0A
DPWM_0A
DPWM0B
DPWM_0B
DPWM1A
DPWM_1A
DPWM1B
DPWM_1B
DPWM2A
DPWM_2A
DPWM2B
DPWM_2B
DPWM3A
DPWM_3A
DPWM3B
DPWM_3B
IS-
DPWM0B
VAUXS
AGND
IS-
IS-
DPWM0A
DPWM1A
AGND
AGND
+VO1
ORING_GATE
+VO
ORING_GATE
Schematics
4 Schematics
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Figure 1. UCD3138PSFBEVM-027 Schematics, Sheet 1 of 2
Copyright © 2013, Texas Instruments Incorporated
6
Using the UCD3138PSFBEVM-027 SLUUAK4–August 2013
Temp = 0.5 + .01*T
0.1 x Vout
0.0549 x Iout
0.1 x Vout
Current Sense Amplifier (Low Offset/ X66.5)
Serial UART Interface
ON/OFF Manual Switching
Temperature sensor
Noise reducing low pass filtering
LED Status indicators
Output voltage divider and noise filter
EMI Control
Current buffer and noise filter
OV threshold at 15.6 V
OVP Latch
0.0343 x Iout
Power On
Ground connection
1
1
1
Parts not populated
and noise conditioning
CHASSIS
1
C47
1nF
R82
16.2k
TP41
C39
10nF
R65
10.0k
C38
10nF
C37
0.1uF
R98
1.82k
C52
1nF
R97
16.2k
R99
1.62k
R68
1.00k
R67
1.00k
C35
0.1uF
C34
220pF
R85
1.00k
C49
1nF
R60
301
R56
3.32k
R69
49.9K
R83
1.82k
R58
10.0k
R63
301
R62
3.32k
R64
10.0k
R57
301
R59
3.32k
R61
10.0k
R84
1.00k
C48
1nF
C42
100pF
R76
0
C45
1nF
C31
0.1µF
C32
0.1 Fµ
C30
0.1 Fµ
TP37
D11
D15
15V
C51
2200pF
R92
10.0k
R89
4.99k
C68
10nF
R101
100k
R102
R18
10.0k
C26
1500pF
C27
100pF
R13
10.0
R14
0
R15
R16
D13
BAT54S
R79
16.2k
R80
1.82k
C57
10nF
R74
2.00k
R75
3.32k
Q3
MMBT3904LT1G
Q5
MMBT3904LT1G
Q9
MMBT3904LT1G
1
EN
2
C1+
3
V+
4
C1-
5
C2+
6
C2-
7
V-
8
R1IN
9
R1OUT
10
INVALID
11
T1IN
12
FORCEON
13
T1OUT
14
GND
15
VCC
16
FORCEOFF
U7
SN75C3221
1
2
3
4
5
6
J7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
P1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
P2
S1
1
2
3
J5
C40
0.1µF
C41
0.1 Fµ
R33
1.00k
R94
549
R95
549
R96
549
TP13
C33
1 Fµ
C69
0.1 Fµ
C70
0.1 Fµ
Q7-A
MMDT3946
Q7-B
MMDT3946
D26
LTST-C190CKT
D2
LTST-C190CKT
D3
LTST-C190GKT
D4
LTST-C190GKT
R81
499
R86
499
U2
OPA345NA
1
+VS
3
GND
2
VOUT
U10
LM60C
C29
0.1 Fµ
1
2
3
4
5
6
7
8
9
10
11
J6
+VO
ON/OFF
AD_07
AGND
AGND
AGND
+RS
-RS
EAP0
EAN0
AGND
ISEC
AGND
GPIO/P_GOOD
AD_13
IS-
GPIO/FAILURE
GPIO/ACFAIL_OUT
AD_08
AGND
VINSCALED
AGND
ISEC
EAN1
EAP1
ISEC
+VO1
AGND
AD_03
3.3V_EXT
GPIO/ACFAIL_IN
AD_09
AGND
+VO1
3.3V_EXT
+VO
3.3V_EXT
OVP_LATCH
AGND
AGND
PWM0
AGND
3.3V_EXT
3.3V_EXT
3.3V_EXT
3.3V_EXT
3.3V_EXT
3.3V_EXT
3.3V_EXT
3.3V_EXT
VAUXPRI
SCI_RX1
SCI_TX1
3.3V_EXT
SCI_RX0
SCI_TX0
DPWM_0A
DPWM_0B
DPWM_1A
DPWM_1B
DPWM_2A
DPWM_2B
DPWM_3A
DPWM_3B
GPIO/ACFAIL_IN
GPIO/ACFAIL_OUT
GPIO/FAILURE
GPIO/P_GOOD
SCI_RX1
GPIO/ORING_CTRL
PWM0
SCI_TX1
SCI_RX0
SCI_TX0
VAUXS
EAP0
EAN0
EAP1
EAN1
EAP2
AD_13
AD_09
AD_08
AD_07
AD_06
AD_04
AD_03
AD_02/I_SHARE
AGND
AD_05
ON/OFF
AD00
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Schematics
SLUUAK4–August 2013 Using the UCD3138PSFBEVM-027
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Copyright © 2013, Texas Instruments Incorporated
Figure 2. UCD3138PSFBEVM-027 Schematics Sheet, 2 of 2
7
RESET
Parts not used
1
1 1
1 1
1
1
1
1
1
1
1
1 1
1
1
1
1
1
1
1
1
1 1 1
1
R14
1.5K
TP2
TP3
TP1
TP6
TP22
TP11
TP23
TP8
TP9
TP10
TP4
TP7
TP16
TP12
TP13
TP14
TP15
TP17
TP18
TP19
TP20
TP21
TP24
TP25
TP26
TP27
TP28
TP29
TP32
TP33
TP34
TP35
TP36
TP30
TP31
1
2
3
4
5
6
7
8
9
10
J1
J2
S1
D1
BAT54A
D2
BAT54A
C31
1000pF
C30
1000pF
C28
1000pF
C29
1000pF
C26
1000pF
C27
1000pF
C24
1000pF
C25
1000pF
C22
1000pF
C23
1000pF
C20
1000pF
C21
1000pF
C18
1000pF
C19
1000pF
C14
1000pF
C7
100pF
C8
1000pF
C17
33pF
C15
33pF
C16
33pF
C9
33pF
C10 33pF
C2
0.1 Fµ
C3
0.1µF
C4
0.1 Fµ
C5
0.1 Fµ
C6
1 Fµ
C11
0.1 Fµ
C12
2.2 Fµ
C1
1 Fµ
C13
0.1 Fµ
R13
1.5K
R12
1.65K
R9
100
R8
100
R7
100
R5 100
R6
0
R3
R1
R2
R4
R11 16K
R10
10K
R15
100K
R16
100
R17
100
R18
100
R20
100
R19
100
R25 100
R23
100
R26
100
R24 2K
R21
2K
R22
2K
R27
2K
R28
2K
R29 2K
NS1
1
AGND
2
AD13
3
AD12
4
AD10
5
AD07
6
AD06
7
AD04
8
AD03
9
V33DIO
10
DGND
11
RESET
12
ADC_EXT
13
SCI_RX0
14
SCI_TX0
15
PMBUS_CLK
16
PMBUS_DATA
17
DPWM0A
18
DPWM0B
19
DPWM1A
20
DPWM1B
21
DPWM2A
22
DPWM2B
23
DPWM3A
24
DPWM3B
25
DGND
26
SYNC
27
PMBUS_ALERT
28
PMBUS_CTRL
29
SCI_TX1
30
SCI_RX1
31
PWM0
32
PWM1
33
DGND
34
INT_EXT
35
FAULT0
36
FAULT1
37
TCK
38
TDO
39
TDI
40
TMS
41
TCAP
42
FAULT2
43
FAULT3
44
DGND
45
V33DIO
46
BP18
47
V33D
48
AGND
49
AGND
50
EAP0
51
EAN0
52
EAP1
53
EAN1
54
EAP2
55
EAN2
56
AGND
57
V33A
58
AD00
59
AD01
60
AD02
61
AD05
62
AD08
63
AD09
64
AD11
65
PWPD
U1
UCD3138RGC
TP5
R39
10
AD-00
SCI-RX1
SCI-TX1
SCI-TX0
SCI-RX0
EXT-TRIG
DPWM-2B
DPWM-2A
DPWM-1B
DPWM-1A
DPWM-0B
DPWM-0A
/RESET
TMS
TDI
TDO
TCK
PWM-1
PWM-0
AD-06
AD-05
AD-04
AD-03
AD-00
EADC-N1
EADC-P1
EADC-N0
DGND
AD-02
AD-07
DPWM-3A
DPWM-3B
EADC-P2
EADC-N2
SYNC
FAULT-0
TCAP
AD-09
AD-10
AD-12
AD-13
EADC-P0
AD-08
AD-01
AD-11
FAULT-3
FAULT-2
FAULT-1
DGND
/RESET
DGND
INT-EXT
DGND
DGND
PMBUS-CTRL
PMBUS-CLK
PMBUS-ALERT
PMBUS-DATA
3.3VD
3.3VD
3.3VD
3.3VD
DGND
DGND
DGND
3.3VA
AGND
AGND
AGND
DGND
Schematics
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Figure 3. UCD3138CC64EVM-030 Schematics, Sheet 1 of 2
8
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If needed, use this jumper
to provide 3.3VD to application board
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
J3
PPPN202FJFN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
J4
PPPN202FJFN
1
IN
2
NC
3
NC
4
GND
5
FB/NC
6
NC
7
NC
8
OUT
9
PWPD
U2
TPS715A33DRBR
TP37
C33
10µF
C32
1µF
R31
301
R30
0.5
R35
10K
R32
10K
R33
10K
R37
10K
R38 10K
R34
0
R36
0
D3
J6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
J5
C34
0.1µF
EADC-N2
EADC-N1
EADC-N0
EADC-P0
EADC-P1
EADC-P2
AD-00
AD-01
AD-02
AD-03
AD-04
AD-05
AD-06
AD-07
AD-08
AD-09
AD-10
AD-11
AD-12
AD-13
DPWM-0A
DPWM-1A
DPWM-2A
DPWM-3A
FAULT-0
SYNC
FAULT-2
SCI-TX1
PWM-0
TCAP
SCI-TX0
INT-EXT
+12V_EXT
DPWM-0B
DPWM-1B
DPWM-2B
DPWM-3B
FAULT-3
SCI-RX1
PWM-1
SCI-RX0
EXT-TRIG
/RESET
3.3VD
TMS
TDI
TDO
TCK
DGND
+12V_EXT
FAULT-1
3.3VD
3.3VD
3.3VD
DGND
DGND
AGND
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Schematics
Figure 4. UCD3138CC64EVM-030 Schematics, Sheet 2 of 2
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UART1
PWR030
P3
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
+VIN
-VIN
J1
J11
TP1
TP2
S1
PWR050
D26
+VOUT
-VOUT
J3
J4
TP17
TP15
D2
D3
D4
J6
P1P2
Test Setup
5 Test Setup
5.1 Test Equipment
DC voltage source: This source is capable of 350 to 400 VDC. The source is adjustable, with a minimum
power rating of 400 W, or current rating no less than 1.5 A, and has a current limit function. The DC
voltage source used should meet IEC61010 safety requirements.
DC multi-meter: The multi-meter has two units, one is capable of a 0 to 400 VDC input range and
preferred four-digit display. The other unit is capable of a 0 to 15 VDC input range and a preferred fourdigit display.
Output load: This DC load is capable of receiving 0 to 15 VDC, 0 to 30 A, and 0 to 360-W or greater, with
display such as load current and load power.
Current meter: If the load does not have a display, this DC current-meter is optional. This unit is capable
of 0 to 30 A. A low-ohmic shunt and DMM are recommended.
Oscilloscope: The oscilloscope is capable of 500-MHz full bandwidth, digital or analog. If choosing a
digital oscilloscope, TI recommends 5 Gs/s or better.
Fan: A fan with 400-LFM forced-air cooling is required.
Recommended wire gauge: The recommended gauge must be capable of 30 A, or better than No. 14
AWG, with the total wire length less than 8 ft (4-ft input and 4-ft return).
5.2 Recommended Test Setup
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Figure 5. UCD3138PSFBEVM-027 Recommended Test Setup
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Figure 6. Orientation of the UCD3138CC64EVM-030 Board on the UCD3138PSFBEVM-027 Board
Test Points
6 Test Points
Test Points Name Description
TP1 +VIN Positive input voltage
TP2 –VIN Input voltage return
TP3 BUS+ Primary high-side current-sense input
TP4 VAUXPRI Primary 12-V bias
TP5 PWRGND Primary 12-V bias return
TP6 VAUX_S Secondary 12-V bias
TP7 PGND Secondary 12-V bias return
TP8 VINSCALED VIN sense on the secondary side
TP9 Ipri Primary current sense
TP10 Control-card mechanical-guide pin
TP11 Not used
TP12 FLTB Oring control
TP13 PGND Secondary 12-V bias return
TP14 +VO1 Output before oring FETs
TP15 PGND Secondary 12-V bias return
TP16 –RS Remote sense of the output voltage
TP17 VO Output voltage positive terminal
TP18 Not used
TP19 +RS Remote sense of the output voltage
TP20 SR1-3 QSYN 1 and 3 drive
TP21 SR2-4 QSYN 2 and 4 drive
TP22 IS– Load current sense
TP23 AGND Analog ground
TP24 Ipri Primary current sense (AD_06)
Table 2. UCD3138PSFBEVM-027 List of Test Points
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Terminals
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Table 2. UCD3138PSFBEVM-027 List of Test Points (continued)
Test Points Name Description
TP25 AGND Analog ground
TP26 QT1_Gate QT1 gate
TP27 QB1_Gate QB1 gate
TP28 QT2_Gate QT2 gate
TP29 QB2_Gate QB2 gate
TP30 Not used
TP31 Not used
TP32 3.3V 3.3 V
TP33 SW1 Switch node
TP34 PWRGND Primary 12-V bias return
TP35 SW2 Switch Node
TP36 CASS Primary commutation-assist junction
TP37 ISEC IOUT sensing output (EADC1 Input)
TP38 Not used
TP39 Not used
TP40 Not used
TP41 S1 S1 status
7 Terminals
Terminal Name Description
Table 3. List of Terminals
J1 Input_P Input voltage positive terminal
J2 Remote Sense Remote sense and I_SHARE
J3 12VO +12-V output
J4 –12VO 12-V output return
J5 Bias VAUX_S and 3.3V_EXT
J6 UART1 Standard UART connection, RS232, 9-pin
J7 UART0 UART0 and ACFAIL_IN (communication with PFC)
J8 VO_RIPPLE BNC VO_Ripple
J9 Jumper Jumper (reserved to an input-fuse substitution)
J10 Jumper Used when T5 not populated
J11 Input_N Input voltage return terminal
12
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8 Test Procedure
8.1 Efficiency Measurement Procedure
Danger of electrical shock! High voltage present during
measurement!
Do not leave the EVM powered when unattended.
Danger of heat burn from high temperature.
1. See Figure 4 for basic setup to measure power-conversion efficiency. The required equipment for this
measurement is listed in Figure 5.
2. Check the boards visually before making electrical connections to ensure that no shipping damage
occurred.
3. Use the UCD3138PSFBEVM-027 and UCD3138CC64EVM-030 for this measurement which are
included this EVM package along with the USB-TO-GPIO.
4. Install the UCD3138CC64EVM-030 board onto the UCD3138PSFBEVM-027 first. Take care with the
alignment and orientation of the two boards to avoid damage.
• See Figure 6 for the UCD3138PFCEVM-030 board orientation.
5. Connect the DC-voltage source to J1 (+) and J11 (–). The DC-voltage source should be isolated and
meet IEC61010 requirements.
• Set up the DC-output voltage in the range specified in Table 1, between 370 VDC and 400V DC;
set the DC-source current limit at 1.2 A.
Test Procedure
WARNING
CAUTION
CAUTION
NOTE: A fuse is not installed on the board and, therefore, the board relies on the current limit of the
external voltage source for circuit protection.
6. Connect an electronic load with either a constant-current mode or constant-resistance mode. The load
range is from 0 to 30 A.
7. Ensure a jumper is installed on J6 of the UCD3138CC64EVM-030
8. Use the switch S1 to turn on the board output after the input voltage is applied to the board. Before
applying input voltage, ensure that the switch, S1, is in the OFF position.
9. Use a current meter or low-ohmic shunt and DMM between the load and the board for current
measurements if the load does not have a current or a power display.
10. Connect a volt-meter across the output connector and set the volt-meter scale at 0 to 15 V (DC).
11. Turn on the DC-voltage source output. Flip S1 to ON and vary the load.
12. Record output voltage and current measurements.
8.2 Equipment Shutdown Procedure
1. Shut down the DC-voltage source
2. Shut down the electronic load.
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11.3
11.5
11.7
11.9
12.1
12.3
5 10 15 20 25 30
Load Regulation (V)
Load Current (A)
370 VDC
385 VDC
400 VDC
C002
60
65
70
75
80
85
90
95
100
5 10 15 20 25 30
Efficiency (%)
Load Current (A)
370 VDC
385 VDC
400 VDC
C001
Performance Data and Typical Characteristics Curves
9 Performance Data and Typical Characteristics Curves
Figure 7, Figure 8, Figure 9, Figure 10, Figure 11, Figure 9, Figure 10, Figure 12, Figure 13, Figure 14,
and Figure 15 present typical performance curves for the UCD3138PSFBEVM-027.
9.1 Efficiency
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9.2 Load Regulation
Figure 7. UCD3138PSFBEVM-027 Efficiency
Figure 8. UCD3138PSFBEVM-027 Load Regulation
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9.3 Switching Waveforms
Performance Data and Typical Characteristics Curves
Figure 9. Gate-Drive Signals at No Load
Figure 10. Gate-Drive Signals at Full Load
Ch1 = QT1 gate to GND (TP26) Ch2 = QB2 Vgs (TP29)
Ch3 = QSYN1 Vgs (TP20) Ch4 = QSYN2 Vgs (TP21)
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Performance Data and Typical Characteristics Curves
Figure 11. Primary-Side Switching
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Ch1 = QB1 Vgs Ch2 = QB1 Vds
Ch3 = QB2 Vgs Ch4 = QB2 Vds
9.4 Output Voltage Ripple
16
Figure 12. Output Voltage Ripple, 385 VDC and Full Load
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Performance Data and Typical Characteristics Curves
Figure 13. Output Voltage Ripple, 385 VDC and Half Load
9.5 Output Turnon
Figure 14. Output Turnon, 385 VDC With Load Range
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EVM Assembly Drawing and PCB layout
9.6 Bode Plots
Figure 15. Control-Loop Bode Plots at 385 VDC Across Load Range
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10 EVM Assembly Drawing and PCB layout
Figure 16, Figure 17, Figure 18, Figure 19, Figure 20 and Figure 21 show the design of the
UCD3138PSFBEVM-027 printed circuit board (PCB). The PCB dimensions are L × W = 8 × 6 in, the PCB
material is FR4, or compatible, four layers with 2-oz copper on each layer.
Figure 16. UCD3138PSFBEVM-027 Top-Layer Assembly Drawing (Top view)
18
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