Texas Instruments Using the UCC27714EVM-551 (Rev. A) User guide

Texas Instruments
Brand
Texas Instruments
Model
Using the UCC27714EVM-551 (Rev. A)
Type
User guide
Using the UCC27714EVM-551
User's Guide
Literature Number: SLUUB02A
July 2015–Revised September 2015
User's Guide
SLUUB02A–July 2015–Revised September 2015
600-W Phase-Shifted Full-Bridge (PHSB) Converter
Based on the 600-W PHSB UCC28950 Converter
Cautions and Warnings
CAUTION:
Caution! Do not leave EVM powered when unattended.
HOT SURFACE:
Caution Hot Surface! Contact may cause burns. Do not touch. Please take the proper
precautions when operating.
HIGH VOLTAGE:
Danger High Voltage! Electric shock possible when connecting board to live wire. Board should
be handled with care by a professional. For safety, use of isolated test equipment with
overvoltage/overcurrent protection is highly recommended.
2
600-W Phase-Shifted Full-Bridge (PHSB) Converter Based on the 600-W SLUUB02A–July 2015–Revised September 2015
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WARNING
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General Texas Instruments High Voltage Evaluation (TI HV EMV) User Safety Guidelines
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 those working around you. Contact TI's Product Information Center
http://ti.com/support for further information.
Save all warnings and instructions for future reference.
WARNING
Failure to follow warnings and instructions may result in personal
injury, property damage or death due to electrical shock and 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 suitable 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 50Vrms/75VDC must be
electrically located within a protected Emergency Power Off EPO protected power strip.
(e) Use 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:
As a precautionary measure, it is always good engineering practice to assume that the entire EVM
may have fully accessible and active high voltages.
(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.
3
SLUUB02A–July 2015–Revised September 2015 600-W Phase-Shifted Full-Bridge (PHSB) Converter Based on the 600-W
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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 or safety glasses with side shields or protect
EVM in an adequate lucent plastic box with interlocks from accidental touch.
Limitation for safe use:
EVMs are not to be used as all or part of a production unit.
4
600-W Phase-Shifted Full-Bridge (PHSB) Converter Based on the 600-W SLUUB02A–July 2015–Revised September 2015
PHSB UCC28950 Converter
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Introduction
1 Introduction
This 600-W EVM was designed to demonstrate how the UCC28950 control device, UCC27524A and
UCC27714 gate drivers could be used in high-efficiency applications by achieving ZVS from 50% to 100%
load. To achieve this high efficiency the UCC28950 was designed to drive synchronous rectifiers on the
secondary side of the full-bridge converter. The UCC28950 also incorporates a burst mode and DCM
function to improve no-load efficiency. Please see UCC28950 data sheet for details.
The UCC277714 is a high-speed, high-voltage, high-side/low-side gate driver optimized for driving
MOSFETs in high-frequency, switch-mode power supplies that are based on bridge-type topologies. It
enables users to eliminate bulky gate-drive transformers in offline power supplies and achieve fast
switching of power MOSFETs by virtue of its low propagation delay and high-peak-drive current.
2 Description
The UCC27714EVM-551 is a 600-W phase-shifted, full-bridge converter that converts a 370-V
DC
to 410-
V
DC
input to a regulated 12-V output. This converter was designed to maintain ZVS down to 50% load.
2.1 Features
• ZVS from 50% to 100% load
• Higher Efficiency for 80-plus Applications
• Burst Mode/DCM Function (reduces no-load power dissipation to meet green mode requirements)
• Features UCC28950 controller, UCC27714 High-Voltage, High-Side/Low-Side Gate Driver,
UCC27524A Dual-Channel Low-Side Gate Driver and CSD19506KCS MOSFETs
2.2 Typical Applications for Phase-Shifted Full Bridge
• Server, Telecom Power Supplies
• Industrial Power Systems
• High-Density Power Architectures
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Electrical Performance Specifications
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3 Electrical Performance Specifications
Table 1. UCC27714EVM-551 Electrical Specifications
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input Characteristics
DC input voltage range 370 390 410 V
Maximum input current V
IN
= 370 V
DC
to 410 V
DC
2 A
Output Characteristics
Output voltage (V
OUT
) V
IN
= 370 V
DC
to 410 V
DC
11.4 12 12.6 V
Output current (I
OUT
) V
IN
= 370 V
DC
to 410 V
DC
50 A
Continuous output power (P
OUT
) V
IN
= 370 V
DC
to 410 V
DC
600 W
Load regulation V
IN
= 370 V
DC
to 410 V
DC
150 mV
I
OUT
= 5 A to 50 A
Line regulation V
IN
= 370 V
DC
to 410 V
DC
150 mV
I
OUT
= 5 A to 50 A
Output ripple voltage V
IN
= 370 V
DC
to 410 V
DC
200 mV
I
OUT
= 5 A to 50 A
Holdup time V
IN
stepped from 390 V
DC
to 0 V
DC
17 ms
P
OUT
= 500 W
System
Full load efficiency V
IN
370 V to 390 V, P
OUT
= 500 W 93% 94%
(1)
Operation ambient temperature full load, forced-air cooling 400 LFM at 25°C.
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600-W Phase-Shifted Full-Bridge (PHSB) Converter Based on the 600-W SLUUB02A–July 2015–Revised September 2015
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CS
SYNC
OUTA
OUTC
OUTF
OUTE
VOUT
OUTF
OUTD
OUTB
GND
GND
OUTE
PWRGND
CS
VOUT
390V/2A
PWRGND
PWRGND
J1
VIN+
TP6
PWRGND
0.47µF
C2
TP1
VBULK
1.0Meg
R12
1.0Meg
R3
10.0k
R17
HS1
Q3,Q4
3.01
R5
TP10
VBIAS
TP11
PWRGND
TP7
SYNC
SYNC
GND
GND
D9
MURS360T3G
Q1, Q2
10.0k
R25
6.19
R22
GND
D6
ES3BB-13-F
GND
1500µF
C4
1500µF
C5
GND
TP2
LOOP-
TP3
LOOP+
J2
VIN-
1
3
5
6
4
2
7
9
10
8
12
11
14
13
J5
1.0Meg
R14
3.01
R15
10.0k
R11
10.0k
R10
10.0k
R16
HS2
2
3
1
5
T1
PE-63587
D4
ES3BB-13-F
100k
R6
1.00k
R7
1µF
C11
1µF
C12
1000pF
C13
330µF
C3
3.01
R4
22µF
C24
1µF
C23
1µF
C18
Q6, Q7
48.7
R1
4.87k
R2
D1
1N4148W-7-F
10.0k
R24
6.19
R21
TP5
VOUT-
1500µF
C6
1500µF
C7
GND
49.9
R9
1500µF
C8
12V/50A
FC1
5.11
R29
Q1
SPP20N60C3
Q3
SPP20N60C3
3.01
R13
Q6
CSD19506KCS
D12
BAT54-7-F
D13
BAT54-7-F
L1
75PR8108
9
1
7
12
3
10
T2
75PR8107
Q7
CSD19506KCS
0.22µF
C1
1µF
C9
1µF
C10
TP4
VOUT+
1.00k
R8
J4
J3
HS3
1
2
3
4
5
6
7
8
L2
60PR964
ENA
1
INA
2
GND
3
INB
4
OUTB
5
VDD
6
OUTA
7
ENB
8
U3
UCC27524AD
Q2
SPP20N60C3
Q4
SPP20N60C3
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
U1
UCC27714D
D10
MURS360T3G
D11
MURS360T3G
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
U2
UCC27714D
GND
PWRGND
PWRGND
PWRGND
GND
OUTA
OUTB
OUTC
OUTD
Q8
MMBT2222A
Q5
MMBT2222A
7.15k
R20
7.15k
R26
PWRGND
GND
5.6V
D14
MMSZ5232B-7-F
5.6V
D15
MMSZ5232B-7-F
TP8
VBIAS2
TP9
PWRGND
22µF
C21
1µF
C20
5.11
R23
PWRGND
1µF
C22
1µF
C19
PWRGND
GND
7.15k
R27
GND
5.11k
R28
7.15k
R30
7.15k
R34
7.15k
R32
5.11k
R31
5.11k
R35
5.11k
R33
1µF
C17
PWRGND
1µF
C16
PWRGND
0.1µF
C14
0.1µF
C15
2.20
R18
2.20
R19
D3
BAT54-7-F
D5
BAT54-7-F
D7
BAT54-7-F
D8
BAT54-7-F
VBIAS2
VBIAS2
VBIAS2
VBIAS2
VBIAS
VBIAS
VBIAS
VBIAS
GND
VCC1
1
GND1
2
INA
3
INB
4
INC
5
IND
6
NC
7
GND1
8
GND2
9
EN
10
OUTD
11
OUTC
12
OUTB
13
OUTA
14
GND2
15
VCC2
16
U4
ISO7240MDW
GND
Pins Description
1 SYNC
2 CS
3 OUTA
4 OUTD
5 OUTB
6 OUTC
8 OUTF
9 VBIAS
10 OUTE
7, 11, 12 GND
13, 14 VOUT
FC2
F1
Fuse, 2A, 250V, TH
i
SW
D2
MURS360T3G
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Schematic
4 Schematic
Figure 1. UCC27714EVM-551 Power Stage Schematic
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SLUUB02A–July 2015–Revised September 2015 600-W Phase-Shifted Full-Bridge (PHSB) Converter Based on the 600-W
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VREF
OUTE
OUTA
VOUT
SYNC
OUTD
OUTB
VREF
CS
OUTC
OUTF
VOUT
OUTC
OUTF
VBIAS
OUTE
OUTD
VREF
CS
SYNC
OUTA
VBIAS
VOUT
1µF
C1
GND
560pF
C4
No Pop
R12
GND
0
R17
No Pop
R16
0
R20
No Pop
R19
1.00k
R18
1.00k
R25
No Pop
R23
OUTB
No Pop
R27
0
R26
0.15µF
C2
12.1k
R3
2.37k
R2
2.37k
R1
56.2k
R8
0.1µF
C6
22.6
R15
0
R21
16.9k
R24
No Pop
R5
2.37k
R7
27.4k
R9
9.09k
R6
No Pop
C8
61.9k
R11
127k
R14
No Pop
R13
330pF
C7
13.3k
R10
12.1k
R4
825k
R29
No Pop
R28
5600pF
C3
1µF
C5
1.00k
R22
1
2
3
4
5
6
7
8
9
10
11
12
13
14
J1
DF11-14DP-2DS(52)
VREF
1
EA+
2
EA-
3
COMP
4
SS/EN
5
DELAB
6
DELCD
7
DELEF
8
TMIN
9
RT
10
RSUM
11
DCM
12
ADELEF
13
ADEL
14
CS
15
SYNC
16
OUTF
17
OUTE
18
OUTD
19
OUTC
20
OUTB
21
OUTA
22
VDD
23
GND
24
U1
UCC28950PW
VREF
EA+
EA-
COMP
SS/EN
DELAB
DELCD
DELEF
TMIN
RT
DCM
RSUM
ADEL
CS0
SYNC0
OUTF
OUTE
OUTD
OUTC
OUTB
OUTA
VDD
ADELEF
ADEL
ADEL
ADELEF
ADELEF
CS0
CS0
DCM
DCM
GND
CS0
GND
GND
Pins Description
1 SYNC
2 CS
3 OUTA
4 OUTD
5 OUTB
6 OUTC
8 OUTF
9 VBIAS
10 OUTE
7, 11, 12 GND
13, 14 VOUT
Schematic
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Figure 2. UCC27714EVM-551 Daughter Card Controller Schematic
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600-W Phase-Shifted Full-Bridge (PHSB) Converter Based on the 600-W SLUUB02A–July 2015–Revised September 2015
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-
Electronic or
Resistive
Load
+
Volt Meter 3
V
OUT
500V
DC Source
+ -
Volt Meter 1
V
IN
Volt Meter 2
I
IN
=V
RSHUNT1
/R
SHUNT1
TP5-
TP4+
- +
0-20v DC Bias
Supply
TP11
TP10
TP6 -
TP1 +
400 LFM Fan
J3
J4
J2
J1
+ -
0-20v DC Bias
Supply
TP8 TP9
R
SHUNT1
R
SHUNT2
Volt Meter 4
I
IN
=V
RSHUNT1
/R
SHUNT1
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Recommended Basic Test Equipment
5 Recommended Basic Test Equipment
Voltage Sources:
• 500-V
DC
Source Capable of 750 W
• Two DC Power Supply Capable of 20 V
Volt Meters: 4-V Meters
Output Load: 25-V/750-W Load
Precision Shunt Resistors for Measuring Efficiency:
• R
SHUNT1
= 5 A/100 mV
• R
SHUNT2
= 50 A/50 mV
Fan: 400 LFM
Recommended Wire Gauge:
• 18 AWG at V
IN
, V
IN
– to Source
• 8 AWG at V
OUT
, V
OUT
– to Electronic/Resistive Loads
6 Recommended Test Setup
Figure 3. Test Setup to Measure Efficiency
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Recommended Test Setup
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6.1 List of Test Points
Table 2. Test Points
TEST POINTS NAME DESCRIPTION
TP1 VBULK Input voltage positive (VIN+)
TP2 N/A Voltage loop injection point 1
TP3 N/A Voltage loop injection point 2
TP4 VOUT+ Output voltage positive
TP5 VOUT– Output voltage negative
TP6 PWRGND Input voltage ground (VIN–)
TP7 SYNC Synchronization input
TP8 VBIAS2 Bias 2 positive
TP9 GND2 Bias 2 negative
TP10 VBIAS Bias positive
TP11 GND1 Bias negative
7 Power On/Off Procedure
NOTE: It is important to follow the power up and power down procedure to ensure the EVM does
not get damaged.
This EVM was designed to show the performance of the UCC28950, UCC27714 and
UCC27524A in a phase-shifted, full-bridge and is not a standalone power supply. This EVM
does not included input under voltage lockout (UVLO) circuitry that would be present in a
standalone power supply.
1. The EVM was not designed to startup from 0-V input voltage. Please make sure the input voltage is in-
between 370 V and 410 V before applying the bias voltages.
2. Connect test setup similar to Figure 3 before applying power to the EVM.
3. Apply 370 V
DC
to 410 V
DC
to the input of the power converter with the 500-V
DC
source.
4. Set the 0-V to 20-V bias power supplies to 11 V, 12 V Maximum, (This powers the UCC28950 PWM
Controller).
5. When powering down the unit set the 0-V to 20-V DC supply to 0 V.
6. For safety before handling the EVM make sure there are not voltages present on the EVM greater than
50 V (Volt Meter 1).
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Test Data
8 Test Data
8.1 Line/Load Regulation and Efficiency Test Data
Table 3. Line/Load Regulations and Efficiency Test Data
SET V
IN
MEASURED V
IN
I
IN
V
OUT
I
OUT
EFFICIENCY
370 370.3 0.202 12.124 5.02 81%
370 370.0 0.302 12.123 8.02 87%
370 370.2 0.351 12.123 10.02 93%
370 370.2 0.857 12.123 25.03 96%
370 369.9 1.743 12.12 50.02 94%
390 390.4 0.192 12.123 5.02 81%
390 390.4 0.288 12.123 8.03 87%
390 390.3 0.334 12.123 10.03 93%
390 390.3 0.814 12.123 25.03 96%
390 390.0 1.654 12.120 50.07 94%
410 410.1 0.184 12.123 5.02 81%
410 410.1 0.276 12.123 8.02 86%
410 410.1 0.320 12.123 10.03 93%
410 410.0 0.776 12.122 25.04 95%
410 410.0 1.575 12.12 50.07 94%
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Frequency (Hz)
Gain (dB)
Phase (°)
100 200 500 1000 2000 5000 10000 100000
-44 -200
-24 -100
-4 0
16 100
36 200
56 300
D001D008D002
Gain
Phase
Frequency (Hz)
Gain (dB)
Phase (°)
100 200 500 1000 2000 5000 10000 100000
-44 -200
-24 -100
-4 0
16 100
36 200
56 300
D001D008D002
Gain
Phase
Output Power (%)
Efficiency (%)
20% 30% 40% 50% 60% 70% 80% 90% 100%
92%
93%
94%
95%
96%
D001
370V Efficiency
390V Efficiency
410V Efficiency
Output Power (%)
Efficiency (%)
10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
80%
82%
84%
86%
88%
90%
92%
94%
96%
D001
370V Efficiency
390V Efficiency
410V Efficiency
Test Data
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8.2 Efficiency Test Data
Figure 4. Efficiency 10% to 100% Load Figure 5. Efficiency 20% to 100% Load
8.3 Control Loop Gain and Phase Measurement
Figure 6. Loop Gain/Phase at 50 A, f
C
= 2 kHz, PM = 90 Figure 7. Loop Gain/Phase at 5 A, f
C
= 6 kHz, PM = 45
Degrees Degrees
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Test Data
8.4 Transient Response
Startup CH3 = V
OUT
.
Figure 8. V
IN
= 390 V, I
OUT
= 0 A Figure 9. V
IN
= 390 V, I
OUT
= 5 A
Figure 10. V
IN
= 390 V, I
OUT
= 50 A
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Test Data
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8.5 Load Transient Response
CH4 = I
OUT
, CH3 = V
OUT
with 10-V
DC
Offset
Figure 11. V
IN
= 390 V I
OUT
= 50 A to 5 A Figure 12. V
IN
= 390 V, I
OUT
= Stepped from 5 A to 50 A
8.6 Output Ripple Voltage
CH3 = V
OUT
Figure 13. V
IN
= 390 V, I
OUT
= 50 A
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Test Data
8.7 Valley Switching
Loads Lower than 25 A, switch nodes valley switch
(CH1 = Q3g, CH2 = Q4g)
Figure 14. V
IN
= 390 V, I
OUT
= 5 A Figure 15. V
IN
= 390 V, I
OUT
= 5 A
(V
IN
= 390 V, I
OUT
= 5 A AB Valley Switching (Q3d = CH1)) (V
IN
= 390 V, I
OUT
= 5A CD Valley Switching (Q4d = CH3))
Loads Greater than 25 A, the switch nodes ZVS
Figure 16. V
IN
= 390 V, I
OUT
= 25 A Figure 17. V
IN
= 390 V, I
OUT
= 25 A
(V
IN
= 390 V, I
OUT
= 5 A AB Valley Switching (Q3d=CH1) ) (V
IN
= 390 V, I
OUT
= 5 A CD Valley Switching (Q4d=CH3))
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Test Data
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Figure 18. V
IN
= 390 V, I
OUT
= 50 A Figure 19. V
IN
= 390 V, I
OUT
= 50 A
(V
IN
= 390 V, I
OUT
= 5 A AB Valley Switching (Q3d=CH1)) (V
IN
= 390 V, I
OUT
= 5 A CD Valley Switching (Q4d = CH3))
16
600-W Phase-Shifted Full-Bridge (PHSB) Converter Based on the 600-W SLUUB02A–July 2015–Revised September 2015
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Test Data
8.8 UCC27714 Gate Drive Performance
8.8.1 LI, LO propagation delay CH1 (VDD), CH2(LO), CH3(LI)
Figure 20. LI, LO Turn-On Propagation Delay Figure 21. LI, LO Turn-Off Propagation Delay
8.8.2 First LI LO Pulse at Power Up
(CH1 (VDD), CH2(LO), CH3(LI),
Drop in VDD at first LO pulse due to charging HB capacitor)
Figure 22. VDD Drop On First Bootstrap Capacitor Charging
17
SLUUB02A–July 2015–Revised September 2015 600-W Phase-Shifted Full-Bridge (PHSB) Converter Based on the 600-W
PHSB UCC28950 Converter
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Test Data
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8.8.3 HI HO Propagation Delay
(CH2 (LO), CH1(HI), CH3(HO), CH4(VDD)
HO was measured with a 1:20 differential probe)
Figure 23. HI, HO Turn-On Propagation Delay
Figure 24. HI, HO Turn-Off Propagation Delay
18
600-W Phase-Shifted Full-Bridge (PHSB) Converter Based on the 600-W SLUUB02A–July 2015–Revised September 2015
PHSB UCC28950 Converter
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Copyright © 2015, Texas Instruments Incorporated
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Test Data
8.8.4 HB (CH2), HI(CH1), HO(CH3), LO(CH4) During Power Up
1. HB and HO were measured with 1:20 differential probes.
2. HB charges up on first LO pulse.
3. HO will not become active on the first HI pulse.
• Includes a built-in fixed delay, please refer to the UCC27714 data sheet for details.
Figure 25. HB and HO Measurement During Start Up
8.8.5 Q3g(CH1), Q1g(CH3), Q4g(Ch2), Q2g(Ch4) During Soft-Start Power Up
1. VBIAS1 and VBIAS2 set at 11 V.
2. UCC28950 soft start capacitor C2 pulled to ground and then released to activate soft start.
3. Q1g and Q2g measured with 1:20 differential probes.
4. Q1g and Q2g are driven with HO pins from the UCC27714 U1 and U2.
There is roughly a 90us delay before the HO outputs become active.
This is a combination of the UCC28950’s burst mode function and UCC27714 built-in delay check the
device data sheets for delay details.
Figure 26. Q
g
Measurement During Startup
19
SLUUB02A–July 2015–Revised September 2015 600-W Phase-Shifted Full-Bridge (PHSB) Converter Based on the 600-W
PHSB UCC28950 Converter
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated
Test Data
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UCC28950 during soft start enters burst mode.
Please refer to the UCC28950 data sheet for details.
Figure 27. UCC28950 Burst-Mode Function
Q3g (CH1), Q1g (CH3), Q4g (Ch2), Q2g (V
OUT
) during soft-start startup.
Ch1 = 1:20 differential probe.
Figure 28. UCC28950 Burst-Mode Function During Soft Start
20
600-W Phase-Shifted Full-Bridge (PHSB) Converter Based on the 600-W SLUUB02A–July 2015–Revised September 2015
PHSB UCC28950 Converter
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated
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Texas Instruments Using the UCC27714EVM-551 (Rev. A) User guide

Texas Instruments
Brand
Texas Instruments
Model
Using the UCC27714EVM-551 (Rev. A)
Type
User guide
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