Texas Instruments Using the UCD3138ALLCEVM150 (Rev. A) User guide

Texas Instruments
Brand
Texas Instruments
Model
Using the UCD3138ALLCEVM150 (Rev. A)
Type
User guide
Using the UCD3138ALLCEVM150
User's Guide
Literature Number: SLUUB97A
March 2015–Revised January 2016
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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
RMS
/75 VDC must be
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 de-
energized.
(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.
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.
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Introduction
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Digitally Controlled LLC Resonant Half-Bridge DC-to-DC Converter
User's Guide
SLUUB97A–March 2015–Revised January 2016
Digitally Controlled LLC Resonant Half-Bridge DC-to-DC
Converter
0.1 Introduction
The UCD3138ALLCEVM150 EVM helps evaluate the UCD3138A 64-pin digital control device in an off-line
power converter application and then to aid in its design. The EVM is a standalone LLC resonant half-
bridge DC-to-DC power converter. The EVM is used together with its control card, the
UCD3138ACCEVM149 EVM. The UCD3138ARGC is placed on the UCD3138ACCEVM149 EVM.
The UCD3138ALLCEVM150 and UCD3138ACCEVM149 devices can be used as delivered without
additional work, from either hardware or firmware, to evaluate an LLC resonant half-bridge DC-to-DC
converter. This EVM combination allows for some of its design parameters to be returned using a GUI
based tool, called Texas Instruments Fusion Digital Power Designer. It is also possible to load custom
firmware with user’s own definition and development.
The two EVMs included are the UCD3138ALLCEVM150 and the UCD3138ACCEVM149.
This user’s guide provides basic evaluation instruction from a viewpoint of system operation in a
standalone LLC resonant half-bridge DC-to-DC power converter.
WARNING
• High voltages are present on this evaluation module during operation and
for a while even 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 while even after power off.
• This EVM’s purpose is to facilitate the evaluation of digital control in an LLC
using the UCD3138A, 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.
• Read and understand this user’s guide thoroughly before starting any
physical evaluation.
Description
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Digitally Controlled LLC Resonant Half-Bridge DC-to-DC Converter
0.2 Description
The UCD3138ALLCEVM150 and UCD3138ACCEVM149 demonstrate an LLC resonant half-bridge DC-
DC power converter with digital control using the UCD3138A device. The UCD3138A device is located on
the UCD3138ACCEVM149 board. The UCD3138ACCEVM149 is a daughter card with preloaded firmware
that provides the required control functions for an LLC converter. For details of the firmware please
contact TI. UCD3138ALLCEVM150 accepts a DC input from 350 V
DC
to 400 V
DC
, and outputs a nominal
12 V
DC
with full load output power of 340 W, or full output current of 29 A.
NOTE: This EVM does not have an input fuse and relies on the input current limit from the input
voltage source used.
0.2.1 Typical Applications
• Offline DC-to-DC Power Conversion
• Servers
• Telecommunication Systems
0.2.2 Features
• Digitally Controlled LLC Resonant Half-Bridge DC-to-DC Power Conversion
• DC Input from 350 V
DC
to 400 V
DC
• 12 V
DC
Regulated Output from No Load to Full Load
• Full-Load Power 340 W, or Full-Load Current 29 A
• High Efficiency
• Constant Soft-Start Time
• Protection: Over Voltage, Over Current, Brownout and Output Short-Circuit Protection
• Test Points to Facilitate Device and Topology Evaluation
• Synchronous Rectification
• Automatic Mode Switching between LLC Mode and PWM Mode
• Cycle-by-Cycle Current Limiting with Duty Cycle Matching
• Constant Current and Constant Power Control Mode
• PMBUS Communication
• Current Sharing Capability (GUI Enable), Across Paralleled Units
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Performance Specifications
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0.3 Performance Specifications
Table 0-1. UCD3138ALLCEVM150 Performance Specifications
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input Characteristics
Voltage operation range 350 400 V
DC
Input UVLO On 325
Input UVLO Off 310
Input current Input = 350 V
DC
, full load = 29 A 1.2 A
Input current Input = 380 V
DC
, full load = 29 A 1.1
Input current Input = 400 V
DC
, full load = 29 A 1.0
Output Characteristics
Output voltage, V
OUT
No load to full load 12 VDC
Output load current, I
OUT
350 V
DC
to 400 V
DC
29 A
Output voltage ripple 380 V
DC
and full load = 29 A 200 mVpp
Output over current Operation 10s then latch-off shutdown 30 A
Systems Characteristics
Switching frequency Resonant mode 35 150 kHz
PWM Mode 150
Peak efficiency 380 V
DC
, full load = 29 A 94.85%
Full-load efficiency 380 V
DC
, load = 20 A 94.20%
Operating temperature Natural convection 25 ºC
Firmware
Device ID (version) UCD3138A
Filename 3138ALLCEVM_150_150205.x0
LED Indicators
On/off control
Device Address
I Share Bus
ON OFF
R10
301
R7
0.1µF
C8
301
R8
Q2
2N7002-7-F
301
R6
5.11k
R9
Q3
2N7002-7-F
C10
Q1
2N7002-7-F
J4
0.01µF
C9
Red
D6
Red
D4
Green
D5
ADDRESS
AC_P_FAIL_OUT
ON/OFF
FAILURE P_GOOD
3_3VD
3_3VD 3_3VD
AGND
DGNDDGND DGND DGND
ISHARE
AGND AGND
3_3VD
6
4
5
S1
G12AP
AC_P_FAIL_OUT_LED
External
Power Input
Bias power generation
3.3VD LED Indicator
VAUX_P = +12V
VIN_MON=1.93V at VIN=400V
DGND Test Point
DGND/AGND Damping
EAP1
12V_EXT
AD02
AD05
AD06
EAN1
EAN0
DPWM2B
DPWM1B
DPWM0B
DPWM3B
DPWM2A
DPWM1A
DPWM3A
DPWM0A
EAP0
FAULT0
EAN2 EAP2
AD10
AD13
AD12
AD11
AD09
AD08
AD07
AD04
AD03
AD00
AD01
SYNC
PWM_0 PWM_1
TCAP
SCI_TX0 SCI_RX0
INT_EXT
/RESET
SCI_TX1 SCI_RX1
3.3V
ADC_EXT
FAULT3
FAULT2
FAULT1
Bias_&_Control
BAT54S
D2
301
R4
1µF
C7
1.47k
R1
0.1µF
C2
1.00
R2
0.1µF
C5
1.00
R3
0.1µF
C6
2.2µF
C3
0.1µF
C4
0.1µF
C1
TP1
10.0
R5
Green
D1
Green
1
2
D3
3_3VA
3_3VD_LED
BUS+_HV_PRI
3_3VD
VAUX_P
12VS
3_3VA
VIN_MON
GND_PWR_PRI
GND_PWR_PRI
GND_PWR
GND_PWR AGND
DGND
DGND
DGND
DGND
DGND
AGND
DGND
DGND AGND
ADDRESS
EADC_IOSENSE
+VO_SENSE
DPWM0A
DPWM1A
OVLATCH
P_GOOD
SCI_TX0
AC_P_FAIL_IN
DPWM0B
DPWM1B
ON/OFF
AC_P_FAIL_OUT
SCI_RX0
+VO_SENSE
DPWM2A DPWM2B
-VO_SENSE
IPS
SCI_RX1
VIN_MON
IO_SENSE
ISHARE
TEMP
PWM0
SCI_TX1
EXT_OVP_DISABLE
VIN_MON
VOSADC12 ORING_CTRL
FAILURE
IO_SEN- IO_SEN+
3_3VD
DGND
DGND
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15
17
19
21
23
25
27
29
31
33
35
37
39
16
18
20
22
24
26
28
30
32
34
36
38
40
J2
AGND
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15
17
19
21
23
25
27
29
31
33
35
37
39
16
18
20
22
24
26
28
30
32
34
36
38
40
J3
DGND DGND
VIN+
1
VIN-
2
VinAux
3
VIN-/VAUX RTN
4
12VOUT
5
400V Monitor
6
GND
7
U1
PWR050
IN
1
OUT
8
9
4
GND
U2A
TPS715A33DRBR
J1
12VP_LED
3_3VD12VS
DCT0
DCT1
IN
1
NC
2
NC
3
GND
4
FB/NC
5
NC
6
NC
7
OUT
8
PAD
U8
TPS715A33DRB
0.1µF
C47
3_3V_P
1µF
C46
GND_PWR_PRI
SR_CTRL
Schematics
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0.4 Schematics
Figure 0-1. UCD3138ALLCEVM150 Schematics (1 of 9)
Figure 0-2. UCD3138ALLCEVM150 Schematics (2 of 9)
Redundant OVP circuit.
SCI Interface
V+ = +5.4V
V- = -5.4V
External OVP Disable
PFC Communication Connector
UART
20.0k
R32
100
R30
1.00k
R33
20.0k
R29
100
R31
J6
0.1µF
C26
Q5
2N7002-7-F
10.0k
R34
OVLATCH
3_3VD
+12V
DGND
EXT_OVP_DISABLE
SCI_RX1
SCI_TX1
1
2
3
4
5
6
7
8
9
10
11
J5
182-009-213R171
DGND
1 2
3 4
5 6
J7
3_3VD
SCI_RX0
SCI_TX0 AC_P_FAIL_IN
DGND
EN
1
C1+
2
V+
3
C1-
4
C2+
5
C2-
6
V-
7
RIN
8
ROUT
9
INVALID
10
DIN
11
FORCEON
12
DOUT
13
GND
14
VCC
15
FORCEOFF
16
U5
SN65C3221PW
3_3VD
DGND
0.1µF
C22
DGND
0.1µF
C21
0.1µF
C24
0.1µF
C25
0.1µF
C23
Q4B
MMDT4413-7-F
Q4A
MMDT4413-7-F
AGNDAGND
1mV/1A
1.6V/35A
Output Current Sense
Current Share Compensation
Voltage Feedback
ADC12 Monitoring and Protection
Temperature Sense
TEMPERATURE = 159.6 C - TEMP * 85.5 C/V
1.00k
R17
35.7k
R23
35.7k
R19
220pF
C13
0.01µF
C14
1.00k
R22
0.1µF
C11
1.00k
R18
220pF
C15
0.1µF
C12
1.00k
R12
10.0k
R20
1.00k
R21
2200pF
C16
100
R16
TP2
TP3
2200pF
C17
10.0k
R24
1.00k
R25
549
R13
549
R15
549
R14
D7
MMBD914
10.0k
R26
1.00k
R28
2200pF
C20
0.01µF
C18
0.01µF
C19
100
R27
IOSFB
3_3VA
IO_SENSE
IO_SEN-
IO_SEN+
EADC_IOSENSE
AGND
AGND
AGND
AGND
AGND
PWM0
+VO_SENSE
-VO_SENSE
AGND AGND
12V_RTN AGND AGND
+12VEXT
+12V
+12V
VOSADC12
TEMP
3_3VA
AGND
1
2
3
4
5
U3
OPA376AIDBVR
NC
1
2
V+
4
5
VO
3
GND
U4
LM20BIM7/NOPB
R11
+12VFB
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Schematics
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Figure 0-3. UCD3138ALLCEVM150 Schematics (3 of 9)
Figure 0-4. UCD3138ALLCEVM150 Schematics (4 of 9)
0.312V/A
Primary Current Sense
EMI Suppression
16:1:1
300VDC to 400VDC / 2A
Power_Stage
TP10
124
R50
TP13
1.00k
R46
BAT54S
D9
1.00
R48
TP11
1.00
R44
TP12
1.00k
R49
1.00
R45
TP9
BAT54S
D10
124
R51
1.00
R47
1
2
HS1
1
2
HS2
100pF
C43
Q8
IRLB3036PBF
Q9
IRLB3036PBF
Q10
IRLB3036PBF
Q11
IRLB3036PBF
2200 pF
C39
0.015 µF
C36
0.015 µF
C37
0.015 µF
C38
0.015 µF
C40
0.015 µF
C41
0.015 µF
C42
HS6
HS4HS3
HS5
4
3
5
8
7
6
L1
11698
Q6
SPW20N60CFD
Q7
SPW20N60CFD
VRC
VCDS1
VCSS2
BUS+_HV_PRI
IPS
SR1 SR2
+12V
SR_VDS1
SR_VDS2
GND_PWR
AGND
HSG
HSS
LSG
GND_PWR_PRI
GND_PWR_PRI
TRP1
TRP2
GND_PWR
AGND
1
3
2
5
7
6
8
4
T1
11697
2
1
3
4
T2
CS4200V-01L
GND_PWR_PRI
VIN = 350 to 400VDC, Iin max = 1.5A.
Pri_Gate_Drive
TP5
J8
ED120/2DS
2.2µF
C28
2.2µF
C34
10.0k
R38
TP6
TP7
1.5 µF
C31
47 µF
C30
0.1µF
C35
BUS+_HV_PRI
VIN_HV_PRI
GND_PWR_PRI
HSS
LSG
HSG
GND_PWR_PRI
J9
ED120/2DS
10.0k
R43
J10
923345-07-C
HI
1
LI
2
VSS
3
NC/EN
4
COM
5
LO
6
VDD
7
NC
8
NC
9
NC
10
HS
11
HO
12
HB
13
NC
14
U6
UCC27714D
51
R59
51
R60
2.2
R35
D8
MURS360T3G
5.1
R39
220pF
C27
220pF
C29
5.11k
R37
TP4
10.0
R36
5.11k
R42
TP8
10.0
R41
GND_PWR_PRI
GND_PWR_PRI
GND_PWR_PRI
GND_PWR_PRI
GND_PWR_PRI
VCC1
1
GND1
2
INA
3
INB
4
INC
5
IND
6
DISABLE
7
GND1
8
GND2
9
CTRL
10
OUTD
11
OUTC
12
OUTB
13
OUTA
14
GND2
15
VCC2
16
U7
ISO7240CFQDWRQ1
0.1µF
C33
0.1µF
C32
DPWM0A
DPWM0B
3_3V_P
3_3VD
GND_PWR_PRIGND_PWR
VAUX_P
Schematics
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Figure 0-5. UCD3138ALLCEVM150 Schematics (5 of 9)
Figure 0-6. UCD3138ALLCEVM150 Schematics (6 of 9)
SR gate drivers
SR_Control
TP14
0.1µF
C52
0.1µF
C45
TP15
2.2µF
C44
2.2µF
C51
12VS
SR2
GND_PWR GND_PWR
GND_PWR GND_PWR
12VS
GND_PWR
SR1
10.0k
R58
GND_PWR
DPWM1A
DPWM1B
10.0k
R64
GND_PWR GND_PWR
IN
1
DCT
2
VCC
3
OUT
4
VD
5
CTRL
6
GND
7
U9
UCD7138DRS
IN
1
DCT
2
VCC
3
OUT
4
VD
5
CTRL
6
GND
7
U10
UCD7138DRS
SR_VDS1
SR_VDS2
0
R56
C49
DCT0
0
R63
C56
DCT1
20.0
R52
20.0
R53
SR_CTRL
SR_CTRL
DGND
DGND
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Schematics
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Figure 0-7. UCD3138ALLCEVM150 Schematics (7 of 9)
Output capacitor bank
Load current sense
Diode Oring Control
Bleeder
Resistors
Oscilloscope socket.
VOUT = 12V
IOUT = 0A to 29A
OUTPUT
POUT = 340W max
1.00k
R57
47µF
C50
47µF
C53
47µF
C54
47µF
C55 1.00k
R61
47µF
C68
10.0k
R69
10.0k
R62
100k
R65
549
R70
10.0k
R66
10.0
R67
5.11k
R68
0.01µF
C60
2200pF
C57
100pF
C58
100pF
C59
0.01µF
C61
J12
J11
4
7,8
1,2,3
5,6,
Q12
CSD16325Q5
4
7,8
1,2,3
5,6,
Q13
CSD16325Q5
TP17
TP16
470µF
C66
470µF
C67
470µF
C65
470µF
C64
470µF
C63
0.003
R55
0.1µF
C62
TP19
TP18
4.7µF
C48
+12V
IO_SEN+
IO_SEN-
ORING_CTRL
GND_PWR
DGND
DGND
+12VEXT
+12V
DGND
12VS
+12VEXT
+12V
12V_RTN
+12VEXT
12V_RTN
VDD
1
RSET
2
STAT
3
FLTB
4
OV
5
UV
6
GND
7
GATE
8
RSVD
9
C
10
A
11
FLTR
12
BYP
13
PG
14
U11
TPS2411PWR
NT1
Net-Tie
NT2
Net-Tie
NT3
Net-Tie
0.003
R54
0.003
R40
1
2
3
4
5
J13
NT5
Net-Tie
NT4
Net-Tie
Schematics
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Figure 0-8. UCD3138ALLCEVM150 Schematics (8 of 9)
LOGO
PCB
Texas Instruments
H1
4824
H2
4824
H3
4824
H4
4824
H5
1903C
H6
1903C
H7
1903C
H8
1903C
FID2FID1 FID3
SV601150
A
PCB Number:
PCB Rev:
Assembly Note
ZZ1
These assemblies are ESD sensitive, ESD precautionsshall be observed.
Assembly Note
ZZ2
These assemblies must be clean and free from flux and all contaminants. Use of no clean flux is not acceptable.
Assembly Note
ZZ3
These assemblies must comply with workmanship standards IPC-A-610 Class 2, unless otherwise specified.
FID5FID4 FID6
DANGER HIGH VOLTAGE DANGER HIGH VOLTAGE DANGER HIGH VOLTAGE DANGER HIGH VOLTAGE
DANGER HIGH VOLTAGE
CAUTION HOT SURFACECAUTION HOT SURFACE
CAUTION HOT SURFACE CAUTION HOT SURFACE
CAUTION HOT SURFACECAUTION HOT SURFACE CAUTION HOT SURFACE
CAUTION HOT SURFACE
CAUTION HOT SURFACE
LOGO
PCB
CAUTION. READ USER GUIDE BEFORE USE
H9
4824
H10
1903C
H11
4824
H12
1903C
SH-J1
MECH
H13
SP900S-0.009-00-104
MECH
H14
4880SG
MECH
H15
4880SG
MECH
H16
4880SG
MECH
H17
4880SG
MECH
H18
4880SG
MECH
H19
4880SG
MECH
H20
SP900S-0.009-00-104
MECH
H21
3138ACC32EVM-149
LOGO
PCB
FCC disclaimer
LOGO
PCB
Pb-Free Symbol
MECH
H22
HPA172
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Schematics
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Figure 0-9. UCD3138ALLCEVM150 Schematics (9 of 9)
Test Setup
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0.5 Test Setup
0.5.1 Test Equipment
DC Voltage Source: capable of 350 V
DC
to 400 V
DC
, adjustable, with minimum power rating of 400 W, or
current rating not less than 1.5 A, with current limit function. The DC voltage source to be used should
meet IEC61010 safety requirements.
DC Multimeter: One unit capable of 0-V
DC
to 400-V
DC
input range, four digits display preferred; and one
unit capable of 0-V
DC
to 15-V
DC
input range, four digits display preferred.
Output Load: DC load capable of receiving 0 V
DC
to 15 V
DC
, 0 A to 30 A, and 0 W to 360 W or greater,
with display such as load current and load power.
Current-meter, DC, optional in case the load has no display, one unit, capable of 0 A to 30 A. A low ohmic
shunt and DMM are recommended.
Oscilloscope: capable of 500-MHz full bandwidth, digital or analog, if digital 5 Gs/s or better.
Fan: 200 LFM to 400 LFM forced air cooling is recommended, but not a must.
Recommended Wire Gauge: capable of 30 A, or better than number 14 AWG, with the total length of
wire less than 8 feet (a four foot input and a four foot return).
0.5.2 Recommended Test Setup
Figure 0-10. UCD3138ALLCEVM150 Recommended Test Set Up
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Test Setup
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Figure 0-11. Orientation of Board UCD3138ACCEVM149 on Board UCD3138ALLCEVM150
List of Test Points
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0.6 List of Test Points
Table 0-2. UCD3138ACCEVM149 Test Points
TEST POINTS NAME DESCRIPTION
TP1 DGND Digital GND
TP2 Not Used
TP3 Not Used
TP4 HSG Primary high-side MOSFET gate, Q6
TP5 Input + Input + after jumper J10
TP6 Input_P Input voltage positive terminal
TP7 Input_N Input voltage return terminal
TP8 LSG Primary low-side MOSFET gate, Q7
TP9 HSS Primary-side switch node, or the intersection of Q6 and Q7
TP10 SWC Primary side, the intersection of bridge capacitors
TP11 SR_VDS1 Drain of secondary side sync FET Q8 and Q9
TP12 SR_VDS2 Drain of secondary side sync FET Q10 and Q11
TP13 IPS Primary current sense
TP14 SR1 SR gate drive to Q8 and Q9
TP15 SR2 SR gate drive to Q10 and Q11
TP16 Vo_N Output voltage return
TP17 Vo_P Output voltage positive terminal
TP18 Xmer_C Power transformer center point of the secondary side windings.
TP19 GND_PWR Power GND
0.7 List of Terminals
Table 0-3. List of Terminals
TERMINAL NAME DESCRIPTION
J1 Bias Input 3 pin, external power input, 12 V
J2 Analog Signal 40-pin header, analog signal to control card (UCD3138ACCEVM149)
J3 Digital Signal 40-pin header, digital signal to control card
J4 I-Share Current share bus connector, 3-pin
J5 UART1 Standard UART connection, RS232, 9 pin
J6 OVP-1 2-pin header, jump across to disable external OVP
J7 Not Used
J8 Input_P Input voltage positive terminal
J9 Input_N Input voltage return terminal
J10 Jumper Reserved to an input fuse substitution
J11 Output_P Output voltage positive terminal
J12 Output_N Output voltage return terminal
J13 Vout Oscilloscope socket
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Test Procedure
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0.8 Test Procedure
0.8.1 Efficiency Measurement Procedure
WARNING
• Danger of electrical shock! High voltage present during the measurement.
• Do not leave EVM powered when unattended.
• Danger of heat burn from high temperature.
1. Refer to Figure 0-10 for basic set up to measure power conversion efficiency. The required equipment
for this measurement is listed in Section 0.5.1.
2. Before making electrical connections, visually check the boards to make sure no shipping damage
occurred.
3. In this EVM package, two EVMs are included, UCD3138ALLCEVM150, and the
UCD3138ACCEVM149. For this measurement, the UCD3138ALLCEVM150 and
UCD3138ACCEVM149 boards are needed.
4. First install the UCD3138ACCEVM149 board onto the UCD3138ALLCEVM150. Care must be taken
with the alignment and orientation of the two boards, or damage may occur. Refer to Figure 0-11 for
UCD3138ACCEVM149 board orientation.
5. Connect the DC voltage source to J8 (+) and J9 (-). The DC voltage source should be isolated and
meet IEC61010 requirements. Set up the DC output voltage in the range specified in Table 0-1,
between 350 V
DC
and 400 V
DC
; set up the DC source current limit 1.2 A.
NOTE: The board has no fuse installed and relies on the external voltage source current limit for
circuit protection.
6. Connect an electronic load with either constant-current mode or constant-resistance mode. The load
range is from zero to 29 A.
7. Check and make sure a jumper is installed on J6.
8. It is recommended to use the switch SW1 to turn on the board output after the input voltage is applied
to the board. Before applying input voltage, make sure the switch, SW1, is in the OFF position.
9. If the load does not have a current or a power display, a current meter or low ohmic shunt and DMM is
needed between the load and the board for current measurements.
10. Connect a volt-meter across the output connector and set the volt-meter scale 0 V to 15 V on its
voltage, DC.
11. Turn on the DC voltage source output, flip SW1 to ON and vary the load. Record output voltage and
current measurements.
0.8.2 Equipment Shutdown
1. Shut down the DC voltage source.
2. Shut down the electronic load.
Performance Data and Typical Characteristic Curves
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0.9 Performance Data and Typical Characteristic Curves
Figure 0-12 through Figure 0-25 present typical performance curves for UCD3138ALLCEVM150.
0.9.1 Efficiency
Figure 0-12. UCD3138ALLCEVM150 Efficiency
0.9.2 Load Regulation
Figure 0-13. UCD3138ALLCEVM150 Load Regulation
Load Current (A)
Switching Frequency (kHz)
5 7.5 10 12.5 15 17.5 20 22.5 25 27.5 30
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
D001
350 VDC
380 VDC
400 VDC
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Performance Data and Typical Characteristic Curves
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0.9.3 Switching Frequency Control
Figure 0-14. Switching Frequency Control in LLC Mode
0.9.4 Load Operation with LLC and PWM
Figure 15. LLC Resonant Mode Operation at Full Load
(Ch1 = V
GS
of Q7, Ch2 = current in resonant network, 2
A/div, Ch3 = V
DS
of Q7, Ch4 = V
O
ripple)
Figure 16. PWM Mode Operation after F
SW
= 150 kHz
(Ch1 = V
GS
of Q7, Ch2 = V
GS
of Q6, Ch3 = V
GS
of SR2, Ch4 =
V
GS
of SR3)
Performance Data and Typical Characteristic Curves
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0.9.5 Very Light-Load Operation at High Line of Input
Figure 17. PWM Control at 400VDC Input and Light Load
(SR off)
(Ch1 = V
GS
, Q7, Ch2 = V
GS
, Q6, Ch3 = V
GS
, SR1, Ch4 = V
GS
,
SR2)
Figure 18. PWM Control with SR Off and Pulse Skipping
(Ch1 = V
GS
, Q7, Ch2 = V
GS
, Q6, Ch3 = V
GS
, SR1, Ch4 = V
GS
,
SR2)
0.9.6 Output Voltage Ripple
Figure 19. Output Voltage Ripple 380 V
DC
and Full Load
Figure 20. Output Voltage Ripple 380 V
DC
and Half Load
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Performance Data and Typical Characteristic Curves
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0.9.7 Output Turn On
Figure 21. Output Turn On 380 V
DC
with Load Range
Figure 22. Output Turn On 350 V
DC
with Load Range
0.9.8 Other Waveforms
Figure 0-23. 380 V
DC
and 30 A Before OCP Latch-Off Shutdown
(Ch1 = V
DS
of Q7, Ch2 = current of resonant network, Ch3 = V
O
ripple)
Frequency (Hz)
Gain (dB)
Phase (°)
100 200 300 500 7001000 20003000 5000 10000
-50 -150
-40 -120
-30 -90
-20 -60
-10 -30
0 0
10 30
20 60
30 90
40 120
50 150
D001D008D002
Gain
Phase
Frequency (Hz)
Gain (dB)
Phase (°)
100 200 300 500 7001000 20003000 5000 10000
-50 -150
-40 -120
-30 -90
-20 -60
-10 -30
0 0
10 30
20 60
30 90
40 120
50 150
D001D008D002
Gain
Phase
Performance Data and Typical Characteristic Curves
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Figure 0-24. Control Loop Bode Plots at 380 V
DC
and Full Load
Figure 0-25. Control Loop Bode Plots at 400 V
DC
and Full Load
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Texas Instruments Using the UCD3138ALLCEVM150 (Rev. A) User guide

Texas Instruments
Brand
Texas Instruments
Model
Using the UCD3138ALLCEVM150 (Rev. A)
Type
User guide
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