Texas Instruments TPS53819AEVM-123 User manual

User's Guide
SLVU719A–May 2012–Revised December 2012
Using the TPS53819AEVM-123 Wide Input Voltage,
Eco-mode, Single Synchronous Step-Down Controller
with PMBus™
The TPS53819AEVM-123 evaluation module (EVM) is designed to evaluate the TPS53819A. The
TPS53819A is a small-size single-buck controller with adaptive on-time D-CAP2 mode control. It provides
a fixed 1.2-V output at up to 25 A from a nominal 12-V input bus. This controller is an analog PWM
controller allowing programming and monitoring via the PMBus interface. The TPS53819AEVM-123 also
uses a 5 mm × 6 mm TI power block MOSFET (CSD87350Q5D) for high power density and superior
thermal performance.
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Contents
1 Description ................................................................................................................... 2
1.1 Typical Applications ................................................................................................ 3
1.2 Features ............................................................................................................. 3
2 Electrical Performance Specifications .................................................................................... 3
3 Schematic .................................................................................................................... 4
4 Test Setup ................................................................................................................... 5
4.1 Test and Configuration Software ................................................................................. 5
4.2 Test Equipment ..................................................................................................... 5
4.3 Recommended Test Setup ....................................................................................... 7
4.4 List of Test Points .................................................................................................. 7
4.5 Jumper Configuration: Enable Selection ........................................................................ 8
5 EVM Configuration Using the Fusion GUI ............................................................................... 8
5.1 Configuration Procedure .......................................................................................... 8
5.2 Default Fusion GUI Screenshots and Description ............................................................. 9
6 Test Procedure ............................................................................................................ 11
6.1 Line and Load Regulation and Efficiency Measurement Procedure ....................................... 11
6.2 Control Loop Gain and Phase Measurement Procedure .................................................... 11
6.3 Equipment Shutdown ............................................................................................ 11
7 Performance Data and Typical Characteristic Curves ................................................................ 12
7.1 Efficiency .......................................................................................................... 12
7.2 Load Regulation .................................................................................................. 12
7.3 Line Regulation ................................................................................................... 13
7.4 fSW Versus Load ................................................................................................... 13
7.5 Bode Plot .......................................................................................................... 14
7.6 Transient Response .............................................................................................. 14
7.7 Output Ripple ..................................................................................................... 15
7.8 Switching Node ................................................................................................... 16
7.9 Turn On Waveform ............................................................................................... 17
7.10 Turn Off Waveform ............................................................................................... 18
7.11 Pre-bias Turn On Waveform .................................................................................... 19
7.12 Thermal Images .................................................................................................. 19
8 EVM Assembly Drawing and PCB layout .............................................................................. 21
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Description www.ti.com
9 Bill of Materials ............................................................................................................. 25
List of Figures
1 TPS53819AEVM-123 Schematic ......................................................................................... 4
2 Tip and Barrel Measurement for VOUT Ripple............................................................................ 6
3 Probe with Short Ground Lead for VOUT Ripple Across C14........................................................... 6
4 TPS53819AEVM-123 Recommended Test Set Up .................................................................... 7
5 Selection of Device Scan Options ........................................................................................ 9
6 TPS53819A GUI Configure General Tab................................................................................ 9
7 TPS53819A GUI Configure, All Config Tab............................................................................ 10
8 TPS53819A GUI Status .................................................................................................. 10
9 TPS53819AEVM-123 Efficiency......................................................................................... 12
10 TPS53819AEVM-123 Load Regulation................................................................................. 12
11 TPS53819AEVM-123 Line Regulation.................................................................................. 13
12 TPS53819AEVM-123 fSW Versus Load ................................................................................. 13
13 TPS53819AEVM-123 Loop Response Gain and Phase ............................................................. 14
14 TPS53819AEVM-123 Load Transient, 12 VIN, 0–15-A Eco-mode ................................................. 14
15 TPS53819AEVM-123 Load Transient, 12 VIN, 0–15-A FCCM ...................................................... 15
16 TPS53819AEVM-123 Output Ripple, 12 VIN, 25 A.................................................................... 15
17 TPS53819AEVM-123 Output Ripple, 12 VIN, 1-A Load Eco-mode ................................................. 16
18 TPS53819AEVM-123 Switching Node, 12-VIN, 25-A Load Full Bandwidth ........................................ 16
19 TPS53819AEVM-123 Enable Turn on Waveform, 12-VIN, 1-ΩLoad ............................................... 17
20 TPS53819AEVM-123 VIN Turn on Waveform, 12-VIN, 1-ΩLoad .................................................... 17
21 TPS53819AEVM-123 Enable Turn off Waveform, 12 VIN, 1-ΩLoad ............................................... 18
22 TPS53819AEVM-123 VIN Turn off Waveform, 12 VIN, 1-ΩLoad .................................................... 18
23 TPS53819AEVM-123 Enable Turn on waveform, 12 VIN, 1-ΩLoad, 1-V Pre-bias ............................... 19
24 TPS53819AEVM-123 Top Board, 12 VIN, 25-A Fan .................................................................. 19
25 TPS53819AEVM-123 Bottom Board, 12 VIN, 25-A Fan .............................................................. 20
26 TPS53819AEVM-123 Top Layer Assembly Drawing (Top view) ................................................... 21
27 TPS53819AEVM-123 Bottom Layer Assembly Drawing (Bottom view)............................................ 21
28 TPS53819AEVM-123 Top Copper (Top view)......................................................................... 22
29 TPS53819AEVM-123 Internal Layer 1 (Top view).................................................................... 22
30 TPS53819AEVM-123 Internal Layer 3 (Top view).................................................................... 23
31 TPS53819AEVM-123 Internal Layer 4 (Top view).................................................................... 23
32 TPS53819AEVM-123 Internal Layer 5 (Top view).................................................................... 24
33 TPS53819AEVM-123 Bottom Copper (Top view)..................................................................... 24
List of Tables
1 TPS53819AEVM-123 Electrical Performance Specifications ......................................................... 3
2 The Functions of Each Test Points....................................................................................... 8
3 Enable Selection ............................................................................................................ 8
4 TPS53819AEVM-123 List of Materials ................................................................................. 25
1 Description
The TPS53819AEVM-123 is designed to use a regulated 12-V bus to produce a regulated 1.2-V output at
up to 25 A of load current. The TPS53819AEVM-123 is designed to demonstrate the TPS53819A in a
typical low voltage application while providing a number of test points to evaluate the performance of the
TPS53819A.
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www.ti.com Electrical Performance Specifications
1.1 Typical Applications
• Point of load systems
• Storage computer
• Server computer
• Multi-function printer
• Embedded computing
1.2 Features
• Regulated 1.2-V output, marginable and trimmable via the PMBus interface
• 25-A DC steady state output current
• D-CAP2™ more control supporting all ceramic output capacitors
• Programmable soft start via the PMBus interface
• Programmable enable function via the PMBus interface
• Fault report via the PMBus interface
• J2 for external enable function
• Supports pre-bias output voltage start-up
• High efficiency and high-power density by using a TI power block MOSFET
• Convenient test points for probing critical waveforms
• Cycle-by-cycle Valley Overcurrent Limit Protection
2 Electrical Performance Specifications
Table 1. TPS53819AEVM-123 Electrical Performance Specifications(1)
Parameter Test Conditions MIN TYP MAX UNITS
INPUT CHARACTERISTICS
Voltage range, VIN 8 12 14 V
Maximum input current VIN = 8 V, IOUT = 25 A 4.3 A
No load input current VIN = 14 V, IOUT = 0 A with auto skip mode 1 mA
OUTPUT CHARACTERISTICS
Output voltage, VOUT 1.2 V
Output load current, IOUT 0 25 A
Line Regulation: Input voltage = 8 V to 14 V 0.5%
Output voltage regulation Load Regulation: Output current = 0 A to 25 A 0.5%
Output voltage ripple VIN = 12 V IOUT = 25 A 10 mVpp
Output over current IOUT_OC Fault Flag Asserted 25 A
SYSTEMS CHARACTERISTICS
Switching frequency 425 kHz
Peak efficiency VIN = 12 V, IOUT = 10 A 91.0%
Full load efficiency VIN = 12 V, IOUT = 25 A 87.9%
Loop bandwidth VIN = 12 V, IOUT = 25 A 111 kHz
Phase margin VIN = 12 V, IOUT = 25 A 91.4 º
Operating temperature 25 ºC
(1) This design uses TI Default PMBus settings
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()2
CLK
PGOOD
DATA
EN
SCL
SDA
FB VDD
GND
SW
ADDR
VBST
DRVH
DRVL
TRIP VREG
ALERT#
VO PwPd
ALERT#
OPEN= ENABLE
VIN
PGND
Input:
VOUT
PGND
Output:
1.2V @ 0 - 25A
8 - 14V
SW
DRVH
DRVL
PGOOD
VREG
LOOPB
GND
VDD
1
1
1
1
1Not Populated
LOOPA
1
1 1
R4
1.00K
R3
300k
R17
10.0k
C18
1uF
R5
0
1
2
J2
C8
1000pF
1
2
3
4
5
6
7
8
9
10
J4
R14
100k
R18
10.0k
C19
1uF
R1
100k
R9
3
C1
22uF
C4
22uF
C3
22uF
+C6
1
2
3
4
J3
1
2
3
4
J1
C7
0.1uF
R2
100k
R6 4.7
1
2
3
4
5 6 7 8
9
10
11
12
13141516
17
U1 TPS53819ARGT
R10
39.2k
C10
100uF
L1
0.440uH
C2
22uF
C5
0.1uF
Q1
CSD87350Q5D
TP1
TP4
TP5
R8 0
TP8
TP7
TP9
TP3
TP6
TP2
R16
0
TP11
TP12
R15
100k
R12
0
TP10
+C15 +C16
C11
100uF
C12
100uF
C13
100uF
C14
100uF
R7
C17
C9
R11
0
R13
TP13
VIN
VREG
VOUT
VIN
VREG
VREG
VOUT
FB
FB
Schematic www.ti.com
3 Schematic
Figure 1. TPS53819AEVM-123 Schematic
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www.ti.com Test Setup
4 Test Setup
4.1 Test and Configuration Software
In order to change any of the default configuration parameters on the EVM, it is necessary to obtain the TI
Fusion Digital Power Designer software.
4.1.1 Description
Fusion Digital Power Designer is the Graphical User Interface (GUI) used to configure and monitor Texas
Instrument’s (TI) TPS53819A power controller on this evaluation module (EVM). The application uses the
PMBus protocol to communicate with the controller over serial bus by way of a TI USB Interface Adapter
EVM included.
4.1.2 Features
Some of the tasks performed with the GUI include:
• Turn on or off the power supply output, either through the hardware control line or the PMBus
operation command.
• Configure common operating characteristics such as VOUT, switching frequency, soft start time and
more.
• Monitor status and warnings or fault conditions real-time.
The software is available for download at this location:
http://focus.ti.com/docs/toolsw/folders/print/fusion_digital_power_designer.html
4.2 Test Equipment
Voltage Source: The input voltage source VIN should be a 0–14-V variable DC source capable of
supplying 30 Adc. Connect VIN to J4 as shown in Figure 3.
Multimeters:
•V1: VIN at TP1 (VIN) to TP4 (PGND)
•V2: VOUT at TP7 (VOUT) to TP9 (PGND)
•A1: VIN input current
Output Load: The output load should be an electronic constant-resistance mode load capable of 0 Adc to
25 Adc at 1.2 V. An electronic constant-current load is also acceptable.
Oscilloscope: A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope
must be set for 1-MΩimpedance, 20-MHz bandwidth, AC coupling, 2-μs per division horizontal resolution,
20-mV per division vertical resolution. As shown in Figure 2, test points TP7 and TP9 can be used to
measure the output ripple voltage by placing the oscilloscope probe tip through TP7 and holding the
ground barrel to TP9. It is not recommended to use a long leaded ground connection because this may
induce additional noise due to a large ground loop. Alternatively the output ripple can be measured directly
across C14 with a short ground lead as shown in Figure 3. To measure other waveforms, adjust the
oscilloscope as needed.
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a
Output Ripple
Measurement directly
Across C14
Test Setup www.ti.com
Figure 2. Tip and Barrel Measurement for VOUT Ripple
Figure 3. Probe with Short Ground Lead for VOUT Ripple Across C14
Fan: Some of this EVM’s components may approach temperatures of 60°C during operation. A small fan
capable of 200–400 LFM is recommended to reduce component temperatures while the EVM is operating.
Exercise caution when touching the EVM while the fan is not running and always exercise caution when
touching any circuits that may be live or energized.
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USB Interface Adapter EVM
DC
Source
VIN Load
V1
PC
A1 V2
TPS53819AEVM-123
PWR123 Rev. B
www.ti.com Test Setup
Recommended Wire Gauge:
•VIN to J1 (12-V input): The recommended wire size is 1 × AWG #14 per input connection, with the
total length of wire less than 4 feet (2 feet input, 2 feet return).
•J3 to LOAD: The minimum recommended wire size is 2 × AWG #14, with the total length of wire less
than 4 feet (2 feet input, 2 feet return).
4.3 Recommended Test Setup
Figure 4 is the recommended test set up to evaluate the TPS53819AEVM-123. Working at an ESD
workstation, make sure that any wrist straps, bootstraps or mats are connected referencing the user to
earth ground before power is applied to the EVM.
Figure 4. TPS53819AEVM-123 Recommended Test Set Up
4.3.1 Input Connections
1. Prior to connecting the DC input source VIN, it is advisable to limit the source current from VIN to 10-A
maximum. Make sure VIN is initially set to 0 V and connected to J1 as shown in Figure 4.
2. Connect a voltmeter V1 at TP1 and TP4 to measure the input voltage.
3. Connect a current meter to A1 to measure the input current.
4.3.2 Output Connections
1. Connect Load to J3 and set Load to constant resistance mode to sink 0 Adc before VIN is applied.
2. Connect a voltmeter V2 at TP7 and TP9 to measure the output voltage.
4.3.3 Other Connections
1. When using a fan, ensure air is flowing across the EVM.
2. Connect the ribbon cable from the USB interface adapter to J4.
4.4 List of Test Points
7
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Table 2. The Functions of Each Test Points
Test Points Name Description
TP1 VIN Input voltage
TP2 VREG 5-V LDO output
TP3 PGOOD Power good
TP4 PGND GND reference for VIN
TP5 DRVH High-side driver output
TP6 SW Switching node
TP7 VOUT Output voltage
TP8 DRVL Low-side driver output
TP9 PGND GND reference for VOUT
TP10 VDD Controller power-supply input
TP11 LOOPB Input B for loop injection
TP12 GND GND for sensitive analog circuitry
TP13 LOOPA Input A for loop injection
4.5 Jumper Configuration: Enable Selection
The controller can be enabled and disabled by J3.
Default setting: No Jumper shorts on J3 to Enable the controller.
Table 3. Enable Selection
Jumper Position Enable Selection
Jumper shorts on J3 Disable the controller
No jumper shorts on J3 Enable the controller
5 EVM Configuration Using the Fusion GUI
In order to configure the TPS53819A controller on the EVM from its default values, it is required to use the
TI Fusion Digital Power Designer software. It is necessary to have input voltage applied to the EVM prior
to launching the software so the TPS53819A may respond to the GUI and the GUI can recognize the
TPS53819A. At least 4.25 V must be applied to the VDD pin to overcome the default UVLO setting.
5.1 Configuration Procedure
1. Adjust the input supply to provide at least 4.25 V.
2. Apply the input voltage to the EVM. Refer to Figure 4 for connections and test setup.
3. Launch the Fusion GUI software. If prompted, select GUI scan mode to DEVICE_CODE only. Refer to
Figure 5 for changing device scanning options. The software will recognize the TPS53819A device on
the EVM and load the GUI.
4. Configure the EVM operating parameters as needed.
CAUTION
Some parameters can be configured, such as switching frequency, to values
that can result in erratic or unexpected behavior on this EVM. Consult the
TPS53819A datasheet for guidance in configuration of parameters and impact
on component selection.
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www.ti.com EVM Configuration Using the Fusion GUI
Figure 5. Selection of Device Scan Options
5.2 Default Fusion GUI Screenshots and Description
Figure 6 is a screenshot of the General tab of the Fusion GUI with default configuration where the general
configuration parameters can be set. After modifying a parameter the Write to Hardware button must be
clicked to apply it. When power cycling all parameters reset to the values stored in flash. To change the
values stored in flash, click the Store RAM to Flash button. Figure 7 is a screenshot of the All Config tab
where all accessible registers are viewed. Figure 8 is a screenshot of the Status screen selected on the
bottom-left corner. The USB adapter settings are found in the File menu of the Digital Fusion GUI.
Figure 6. TPS53819A GUI Configure General Tab
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EVM Configuration Using the Fusion GUI www.ti.com
Figure 7. TPS53819A GUI Configure, All Config Tab
Figure 8. TPS53819A GUI Status
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6 Test Procedure
6.1 Line and Load Regulation and Efficiency Measurement Procedure
1. Set up EVM as described in Section 4 and Figure 4.
2. Ensure Load is set to constant resistance mode and to sink 0 Adc
3. Ensure the jumper provided in the EVM shorts on J2 before VIN is applied.
4. Increase VIN from 0 V to 12 V, using V1 to measure input voltage.
5. Remove the jumper on J3 to enable the controller.
6. Use V2 to measure VOUT voltage.
7. Vary Load from 0 to 25 Adc, VOUT should remain in load regulation.
8. Vary VIN from 8 V to 14 V, VOUT should remain in line regulation.
9. Put the jumper on J3 to disable the controller.
10. Decrease Load to 0 A.
11. Decrease VIN to 0 V.
6.2 Control Loop Gain and Phase Measurement Procedure
TPS53819AEVM-123 contains a place holder for a 10-Ωseries resistor in the feedback loop for loop
response analysis.
1. Replace R16 with a 10-Ωresistor.
2. Set up EVM as described in Section 4 and Figure 4.
3. Connect isolation transformer to test points marked TP13 and TP11.
4. Connect input signal amplitude measurement probe (Loop B) to TP11. Connect output signal
amplitude measurement probe (Loop A) to TP13.
5. Connect ground lead of Loop A and Loop B to TP12.
6. Inject around 10 mV or less signal through the isolation transformer.
7. Sweep the frequency from 100 Hz to 1 MHz with 10 Hz or lower post filter. The control loop gain and
phase margin can be measured.
8. Disconnect isolation transformer from bode plot test points before making other measurements (Signal
injection into feedback may interfere with accuracy of other measurements).
6.3 Equipment Shutdown
1. Shut down Load
2. Shut down VIN
3. Shut down fan
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1.2
1.201
1.202
1.203
1.204
1.205
0 5 10 15 20 25
Output Current (A)
Output Voltage Deviation (%)
DCM
FCCM
VIN = 12V
G000
0
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1 10 100
Output Current (A)
Efficiency (%)
8VIN DCM
12VIN DCM
14VIN DCM
8VIN FCCM
12VIN FCCM
14VIN FCCM
G000
Performance Data and Typical Characteristic Curves www.ti.com
7 Performance Data and Typical Characteristic Curves
Figure 9 through Figure 12 present typical performance curves for TPS53819AEVM-123.
7.1 Efficiency
Figure 9. TPS53819AEVM-123 Efficiency
7.2 Load Regulation
Figure 10. TPS53819AEVM-123 Load Regulation
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1
10
100
1000
10000
100000
1000000
0.01 0.1 1 10 100
Input Voltage (V)
Switching Frequency (Hz)
12VIN DCM
12VIN FCCM
G000
1.196
1.198
1.2
1.202
1.204
5 6 7 8 9 10 11 12 13 14
Input Voltage (V)
Output Voltage Deviation (%)
12VIN 15A Load
G000
www.ti.com Performance Data and Typical Characteristic Curves
7.3 Line Regulation
Figure 11. TPS53819AEVM-123 Line Regulation
7.4 fSW Versus Load
Figure 12. TPS53819AEVM-123 fSW Versus Load
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IOUT
VOUT AC
10 100 1000 10000 100000 1000000
−60
−40
−20
0
20
40
60
−180
−120
−60
0
60
120
180
Frequency (Hz)
Gain (dB)
Phase (°)
Gain
Phase
12VIN 25A Load
G000
Performance Data and Typical Characteristic Curves www.ti.com
7.5 Bode Plot
Figure 13. TPS53819AEVM-123 Loop Response Gain and Phase
7.6 Transient Response
Figure 14. TPS53819AEVM-123 Load Transient, 12 VIN, 0–15-A Eco-mode
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VIN AC
VOUT AC
SW
IOUT
VOUT AC
www.ti.com Performance Data and Typical Characteristic Curves
Figure 15. TPS53819AEVM-123 Load Transient, 12 VIN, 0–15-A FCCM
7.7 Output Ripple
Figure 16. TPS53819AEVM-123 Output Ripple, 12 VIN, 25 A
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SW
VOUT AC
SW
Performance Data and Typical Characteristic Curves www.ti.com
Figure 17. TPS53819AEVM-123 Output Ripple, 12 VIN, 1-A Load Eco-mode
7.8 Switching Node
Figure 18. TPS53819AEVM-123 Switching Node, 12-VIN, 25-A Load Full Bandwidth
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VIN
VREG
VOUT
PG
EN
VREG
VOUT
PG
www.ti.com Performance Data and Typical Characteristic Curves
7.9 Turn On Waveform
Figure 19. TPS53819AEVM-123 Enable Turn on Waveform, 12-VIN, 1-ΩLoad
Figure 20. TPS53819AEVM-123 VIN Turn on Waveform, 12-VIN, 1-ΩLoad
17
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VIN
VREG
VOUT
PG
EN
VREG
VOUT
PG
Performance Data and Typical Characteristic Curves www.ti.com
7.10 Turn Off Waveform
Figure 21. TPS53819AEVM-123 Enable Turn off Waveform, 12 VIN, 1-ΩLoad
Figure 22. TPS53819AEVM-123 VIN Turn off Waveform, 12 VIN, 1-ΩLoad
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EN
VREG
VOUT
PG
www.ti.com Performance Data and Typical Characteristic Curves
7.11 Pre-bias Turn On Waveform
Figure 23. TPS53819AEVM-123 Enable Turn on waveform, 12 VIN, 1-ΩLoad, 1-V Pre-bias
7.12 Thermal Images
NOTE: Hottest point is the CSD87350Q5D
Figure 24. TPS53819AEVM-123 Top Board, 12 VIN, 25-A Fan
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Performance Data and Typical Characteristic Curves www.ti.com
NOTE: Hottest point is below the CSD87350Q5D
Figure 25. TPS53819AEVM-123 Bottom Board, 12 VIN, 25-A Fan
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