Texas Instruments TPS53313 User manual

User’s Guide
TPS53313 Step-Down Converter Evaluation Module User's
Guide
Table of Contents
1 Introduction.............................................................................................................................................................................3
2 Description.............................................................................................................................................................................. 3
2.1 Typical Applications............................................................................................................................................................3
2.2 Features............................................................................................................................................................................. 3
3 Electrical Performance Specifications................................................................................................................................. 3
4 Schematic................................................................................................................................................................................4
5 Test Setup................................................................................................................................................................................5
5.1 Test Equipment.................................................................................................................................................................. 5
5.2 Recommended Test Setup.................................................................................................................................................6
6 Configurations........................................................................................................................................................................ 7
6.1 Mode and Soft-Start Time Selection.................................................................................................................................. 7
6.2 Overcurrent Protection (OCP) Selection............................................................................................................................ 7
6.3 Enable Selection................................................................................................................................................................ 7
6.4 Switching Frequency Selection or External Clock Input for Synchronization.....................................................................7
7 Test Procedure........................................................................................................................................................................ 8
7.1 Line/Load Regulation and Efficiency Measurement Procedure......................................................................................... 8
7.2 Control Loop Gain and Phase Measurement Procedure................................................................................................... 8
7.3 List of Test Points............................................................................................................................................................... 8
7.4 Equipment Shutdown......................................................................................................................................................... 8
8 Performance Data and Typical Characteristic Curves........................................................................................................ 9
8.1 Efficiency............................................................................................................................................................................9
8.2 Load Regulation................................................................................................................................................................. 9
8.3 Line Regulation................................................................................................................................................................ 10
8.4 Output Transient...............................................................................................................................................................11
8.5 Output Ripple................................................................................................................................................................... 12
8.6 Switching Node................................................................................................................................................................ 13
8.7 Start Up............................................................................................................................................................................ 14
8.8 Shut Down........................................................................................................................................................................15
8.9 Over-Current Protection................................................................................................................................................... 15
8.10 Synchronization..............................................................................................................................................................16
8.11 Bode Plot........................................................................................................................................................................ 16
8.12 Thermal Image............................................................................................................................................................... 17
9 EVM Assembly Drawing and PCB Layout.......................................................................................................................... 18
10 List of Materials.................................................................................................................................................................. 21
11 Revision History..................................................................................................................................................................22
List of Figures
Figure 4-1. TPS53313EVM-078 Schematic.................................................................................................................................4
Figure 5-1. Tip and Barrel Measurement for VOUT Ripple..........................................................................................................5
Figure 5-2. TPS53313EVM-078 Recommended Test Set Up..................................................................................................... 6
Figure 8-1. Efficiency................................................................................................................................................................... 9
Figure 8-2. Load Regulation........................................................................................................................................................ 9
Figure 8-3. Line Regulation....................................................................................................................................................... 10
Figure 8-4. Output Load 0-A to 3-A Transient Under FCCM Mode (12-V VIN, 1.2-V VOUT, fSW = 600 kHz)............................11
Figure 8-5. Output Load 0-A to 3-A Transient Under Skip Mode (12-V VIN, 1.2-V VOUT, fSW = 600 kHz)............................... 11
Figure 8-6. Output Ripple at No Load (12-V VIN, 1.2-V VOUT, 0-A, Skip Mode, fSW = 600 kHz)............................................. 12
Figure 8-7. Output Ripple at Full Load (12-V VIN, 1.2-V VOUT, 6-A, Skip Mode, fSW = 600 kHz)............................................ 12
Figure 8-8. Switching Node at No Load (12-V VIN, 1.0-V VOUT, 0-A, Skip Mode, fSW = 600 kHz).......................................... 13
Figure 8-9. Switching Node at Full Load (12-V VIN, 1.2-V VOUT, 6-A, Skip Mode, fSW = 600 kHz)......................................... 13
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Figure 8-10. Start-Up Waveform (12-V VIN, 1.2-V VOUT, 6-A IOUT, 1-ms SS)........................................................................ 14
Figure 8-11. Pre-bias Start-Up Waveform (12-V VIN, 1.2-V VOUT, 0-A IOUT, 1-ms SS)..........................................................14
Figure 8-12. Shut-Down Waveform (12-V VIN, 1.2-V VOUT, 0-A IOUT)................................................................................... 15
Figure 8-13. Over-Current Protection Waveform ( 12-V VIN, 1.2-V VOUT, IOUT increases from 6 A to 7.8 A)........................15
Figure 8-14. Synchronization Waveform (12-V VIN, 1.2-V VOUT, 0-A IOUT, free-running frequency = 600 kHz, SYNC
frequency = 750 kHz).............................................................................................................................................................16
Figure 8-15. Loop Gain (12-V VIN, 1.2-V VOUT, 6-A IOUT, Skip Mode, fSW = 600 kHz).......................................................... 16
Figure 8-16. Thermal Image (12-V VIN, 1.2-V VOUT, 6-A IOUT, FCCM Mode, fSW = 600 kHz)............................................... 17
Figure 8-17. Thermal Image (12-V VIN, 1.2-V VOUT, 6-A IOUT, FCCM Mode, fSW = 1.00 MHz)............................................. 17
Figure 9-1. TPS53313EVM-078 Top Layer Assembly Drawing (top view)................................................................................ 18
Figure 9-2. TPS53313EVM-078 Bottom Assembly Drawing (bottom view)...............................................................................18
Figure 9-3. TPS53313EVM-078 Top Copper (top view)............................................................................................................ 19
Figure 9-4. TPS53313EVM-078 Layer 2 (top view)...................................................................................................................19
Figure 9-5. TPS53313EVM-078 Layer 3 (top view)...................................................................................................................20
Figure 9-6. TPS53313EVM-078 Bottom Layer (top view)......................................................................................................... 20
List of Tables
Table 3-1. TPS53313EVM-078 Electrical Performance Specifications(1) ................................................................................... 3
Table 6-1. MODE Selection......................................................................................................................................................... 7
Table 6-2. OCP Selection............................................................................................................................................................ 7
Table 6-3. Switching Frequency Selection...................................................................................................................................7
Table 7-1. Test Point Functions....................................................................................................................................................8
Table 10-1. TPS53313EVM-078 List of Materials......................................................................................................................21
Table of Contents www.ti.com
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1 Introduction
The TPS53313EVM-078 evaluation module (EVM) is a step-down regulator featuring the TPS53313. The
TPS53313 is a fully integrated step-down regulator employing voltage mode control.
2 Description
The TPS53313EVM-078 is designed to use a 12-V voltage rail to produce a regulated 1.2-V output with up to
6-A load current. The TPS53313EVM-078 is designed to demonstrate the TPS53313 in a typical Point-Of-Load
(POL) application while providing a number of test points to evaluate the performance of the TPS53313.
2.1 Typical Applications
• POL applications for 5-V or 12-V step-down rails
2.2 Features
The TPS53313EVM-078 features include:
• Continuous 6-A output current capability
• Support all MLCC output capacitors
• Voltage mode control
• Selectable light-load operation modes (forced continuous conduction mode (FCCM) and skip mode)
• Selectable switching frequency settings (600 kHz and 1.00 MHz)
• Support synchronization to external clock
• Selectable overcurrent threshold
• Soft-stop output discharge during disable
• Overcurrent, overvoltage, undervoltage, and overtemperature protections
• Power-good indication
• Pre-bias output voltage start-up
• Convenient test points for probing critical waveforms
3 Electrical Performance Specifications
Table 3-1. TPS53313EVM-078 Electrical Performance Specifications(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input Characteristic
Voltage range VIN 8.0 12 14 V
Maximum input current VIN = 12 V 0.8 A
No load input current VIN = 12 V, IOUT = 0 A, fSW = 600 kHz under skip
mode
8.0 mA
Output Characteristics
Output voltage 1.2 V
Output voltage regulation Setpoint accuracy,
(VIN = 8.0 V – 14 V, IOUT = 0 A – 6 A)
-1% 1%
Line regulation,
(VIN = 8.0 V – 14 V, IOUT = 6 A)
0.1%
Load regulation,
(VIN = 12 V, IOUT = 0 A – 6 A)
0.2%
Output voltage ripple VIN = 12 V, IOUT = 6 A 10 mVPP
Output load current 0 6.0 A
Over current limit (peak) VIN = 12 V 9
Systems Characteristics
Switching frequency 600/1000 kHz
Peak efficiency VIN = 12 V, IOUT = 3.0 A, fSW = 600 kHz 85.5%
Full load efficiency VIN = 12 V, IOUT = 6.0 A, fSW = 600 kHz 82.4%
Operating temperature 25 °C
(1) Jumpers set to default locations, See section 6 of this user’s guide
www.ti.com Introduction
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4 Schematic
OPEN= ENABLE
1.00MHz>
600kHz>
1
VOUT
GND
4.5A OC>
SKIP 3ms SS>
FCCM 3ms SS>
VIN
GND
6A OC>
FCCM 1mS SS>
SKIP 6ms SS> SKIP 1ms SS>
9A OC>
MODE/SS SELECTION
FCCM 6ms SS>
(External Clock)
FREQUENCY SELECTION
1Not Populated
1
GND
GND
VIN
SW
PG
EN GND
SYNC
GND
CHA
CHB
INJECTION & MEASURING
CONTROL LOOP
Notes:
8V - 14V
1.2V/6A
GND
GND
OCP SELECTION
C19
R3 80.6k
R6 45.3k
R4
300 R5
10.0k
R8
10.0k
R14
0
C13
22uF
TP3 TP6
C10
22uF
C11
22uF
1
2
3
4
5
6
7
8
9
10
11
12
J4
R7
5.60k
R18
0
TP9
C15 0.1uF
C1
1.0uF
1
2
J2
C17 2.2nF
R12 82.0k
R13 160k
R15
R9 10.0k
R10 20.0k
R11 39.0k
TP5
1
2
J1
C6
220pF
R16 10.0
C12
22uF
C14
22uF
TP8
1
2
J5
C16 10nF
1
2
3
4
J3
C5
560pF
R2
51.0k
C2
22uF
TP10
1
EN
2
PG
3
VIN
4
VIN
5
VIN
6
VIN
7PGND
8PGND
9PGND
10 PGND
11 PGND
12 PGND
13 SW
14 SW
15 SW
16 SW
17 VBST
18 BP7
19
BP3
20
AGND
21
RT/SYNC
22
MODE/SS
23
COMP
24
FB
25 PWPD
U1
TPS53313RGE
TP13
C4
22uF
C3
22uF
R17
1.00
C18
1.0nF
TP14
TP2
R1
22.0k
TP1
TP4
C8
1.0uF
C9
1.0uF
C7
10nF
TP12
TP11
TP7
L1
1.0uH
1
2
3
4
5
6
J6
VOUT
GND
GND
Figure 4-1. TPS53313EVM-078 Schematic
Schematic www.ti.com
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5 Test Setup
5.1 Test Equipment
Voltage Source (VIN): The input voltage source, (VIN), should be a 0-V to 15-V variable DC source capable of
supplying 2 ADC. Connect VIN to J2 as shown in Figure 5-2.
Multimeters:
•V1: VIN at TP3 (VIN) and TP6 (GND), 0-V to 15-V voltmeter
•V2: VOUT at TP10 (VOUT) and TP8 (GND)
•A1: VIN input current, 0-ADC to 2-ADC Ammeter
Output Load: The output load should be an electronic constant resistance mode load capable of 0 ADC to 6 ADC
at 1.2 V.
Oscilloscope: A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope
should be set for 1-MΩ impedance, 20-MHz bandwidth, AC coupling, 1-µs/div. horizontal resolution, 20-mV/div.
vertical resolution. Test points TP10 and TP8 can be used to measure the output ripple voltage by placing the
oscilloscope probe tip through TP10 and holding the ground barrel on TP8 as shown in Figure 5-1. Using a
leaded ground connection may induce additional noise due to the large ground loop.
TP10 TP8
Figure 5-1. Tip and Barrel Measurement for VOUT Ripple
Fan: Some of the components in this EVM may approach temperatures of 80°C during operation. A small
fan capable of 200 LFM to 400 LFM is recommended to reduce component temperatures while the EVM is
operating. The EVM should not be probed while the fan is not running.
Recommended Wire Gauge:
•VIN to J2: The recommended wire size is 1x AWG #16 per input connection, with the total length of wire less
than 4 feet (2 feet input, 2 feet return).
•J5 to LOAD: The minimum recommended wire size is 1x AWG #16, with the total length of wire less than 4
feet (2 feet output, 2 feet return).
www.ti.com Test Setup
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5.2 Recommended Test Setup
Figure 5-2 is the recommended test set up to evaluate the TPS53313EVM-078. 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 5-2. TPS53313EVM-078 Recommended Test Set Up
5.2.1 Input Connections
• Prior to connecting the DC input source (VIN), it is advisable to limit the source current from VIN to 2 A
maximum. Make sure VIN is initially set to 0 V and connected to J2 as shown in Figure 5-2.
• Connect a current meter A1 between VIN and J2 to measure the input current.
• Connect a voltmeter V1 at TP3 (VIN) and TP6 (GND) to measure the input voltage.
5.2.2 Output Connections
• Connect Load to J5 and set load to constant resistance mode to sink 0 ADC before VIN is applied.
• Connect a voltmeter V2 at TP10 (VOUT) and TP8 (GND) to measure the output voltage.
5.2.3 Other Connections
• Place a fan as shown in Figure 5-2 and turn on, making sure air is flowing across the EVM.
Test Setup www.ti.com
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6 Configurations
All Jumper selections should be made prior to applying power to the EVM. User can configure this EVM per
following configurations.
6.1 Mode and Soft-Start Time Selection
The operation mode and soft-start time can be set by J4.
6.1.1 Default Setting: Skip Mode, 6-ms SS
Table 6-1. MODE Selection
MODE RESISTANCES OPERATION MODE SOFT-START TIME
10.0 kΩ FCCM 6 ms
20.0 kΩ FCCM 3 ms
39.0 kΩ FCCM 1 ms
82.0 kΩ Skip 6 ms
160 kΩ Skip 3 ms
Open Skip 1 ms
6.2 Overcurrent Protection (OCP) Selection
The OCP threshold can be set by J6.
6.2.1 Default Setting: 9-A OCP
Table 6-2. OCP Selection
OCP SETTING CAPACITANCE OVERCURRENT LIMIT
10 nF 9 A
2.2 nF 4.5 A
Open 6 A
6.3 Enable Selection
The converter can be enabled and disabled by J1.
6.3.1 Default Setting: Short to Disable the Converter
6.4 Switching Frequency Selection or External Clock Input for Synchronization
The switching frequency can be set by J3. If the external clock is used for synchronization, the external clock
should be connected to TP5 (SYNC) and TP7 (GND).
6.4.1 Default setting: 600 kHz
Table 6-3. Switching Frequency Selection
SWITCHING FREQUENCY SETTING RESISTANCES SWITCHING FREQUENCY
80.6 kΩ 600 kHz
45.3 kΩ 1.00 MHz
www.ti.com Configurations
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7 Test Procedure
7.1 Line/Load Regulation and Efficiency Measurement Procedure
1. Set up EVM as described in Section 5 and Figure 5-2.
2. Ensure Load is set to constant resistance mode and to sink 0 ADC.
3. Ensure all jumpers set per Section 6.
4. Increase VIN from 0 V to 12 V. Using V1 to measure VIN voltage.
5. Open jumper J1 to enable the controller.
6. Use V2 to measure VOUT voltage, A1 to measure VIN current.
7. Vary load from 0 ADC to 6 ADC, VOUT should remain in load regulation.
8. Vary VIN from 8.0 V to 14 V, VOUT should remain in line regulation.
9. Short jumper J1 to disable the controller.
10. Decrease load to 0 A.
11. Decrease VIN to 0 V.
7.2 Control Loop Gain and Phase Measurement Procedure
TPS53313EVM-078 contains a 10-Ω series resistor in the feedback loop for loop response analysis.
1. Set up EVM as described in Section 5 and Figure 5-2.
2. Connect isolation transformer to test points marked TP12 and TP11.
3. Connect input signal amplitude measurement probe (channel A) to TP12. Connect output signal amplitude
measurement probe (channel B) to TP11.
4. Connect ground lead of channel A and channel B to TP13.
5. Inject around 10-mV or less signal through the isolation transformer.
6. Sweep the frequency from 500 Hz to 500 kHz with 10-Hz or lower post filter. The control loop gain and
phase margin can be measured.
7. Disconnect isolation transformer from bode plot test points before making other measurements (Signal
injection into feedback may interfere with accuracy of other measurements).
7.3 List of Test Points
Table 7-1. Test Point Functions
TEST POINTS NAME DESCRIPTION
TP1 EN Enable pin
TP2 GND GND
TP3 VIN Input voltage
TP4 PG Power good output
TP5 SYNC Input of external clock for synchronization
TP6 GND GND
TP7 GND GND
TP8 GND GND
TP9 SW Switching node
TP10 VOUT Output voltage
TP11 CHB Input B for loop injection
TP12 CHA Input A for loop injection
TP13 GND GND
TP14 GND GND
7.4 Equipment Shutdown
1. Shut down VIN
2. Shut down Load
3. Shut down FAN
Test Procedure www.ti.com
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8 Performance Data and Typical Characteristic Curves
Figure 8-1 through Figure 8-17 present typical performance curves for TPS53313EVM-078.
8.1 Efficiency
40
45
50
55
60
65
70
75
80
85
90
0 1 2 3 4 5 6
ILOAD - Load Current - A
H- Efficiency - %
VIN = 12 V, fsw = 600 kHz, Skip Mode
VIN = 12 V, fsw = 1.00 MHz, Skip Mode
VIN = 12 V, fsw = 600 kHz, FCCM Mode
VIN = 12 V, fsw = 1.00 MHz, FCCM Mode
Figure 8-1. Efficiency
8.2 Load Regulation
1.18
1.185
1.19
1.195
1.2
1.205
1.21
1.215
1.22
0 1 2 3 4 5 6
ILOAD - Load Current - A
VOUT - Output Voltage - V
VIN = 12 V, fsw =600 kHz, Skip Mode
VIN = 12 V, fsw = 1.00 MHz, Skip Mode
VIN = 12 V, fsw = 600 kHz, FCCM Mode
VIN = 12 V, fsw = 1.00 MHz, FCCM Mode
Figure 8-2. Load Regulation
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8.3 Line Regulation
1.18
1.185
1.19
1.195
1.2
1.205
1.21
1.215
1.22
8 9 10 11 12 13 14
VIN - Input Voltage - V
VOUT - Output Voltage - V
Skip Mode, fsw = 600 kHz, IOUT = 6 A
Skip Mode, fsw = 1.00 MHz, IOUT = 6 A
FCCM Mode, fsw = 600 kHz, IOUT = 6 A
FCCM Mode, fsw = 1.00 MHz, IOUT = 6 A
Figure 8-3. Line Regulation
Performance Data and Typical Characteristic Curves www.ti.com
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8.4 Output Transient
Figure 8-4. Output Load 0-A to 3-A Transient Under FCCM Mode (12-V VIN, 1.2-V VOUT, fSW = 600 kHz)
Figure 8-5. Output Load 0-A to 3-A Transient Under Skip Mode (12-V VIN, 1.2-V VOUT, fSW = 600 kHz)
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8.5 Output Ripple
Figure 8-6. Output Ripple at No Load (12-V VIN, 1.2-V VOUT, 0-A, Skip Mode, fSW = 600 kHz)
Figure 8-7. Output Ripple at Full Load (12-V VIN, 1.2-V VOUT, 6-A, Skip Mode, fSW = 600 kHz)
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8.6 Switching Node
Figure 8-8. Switching Node at No Load (12-V VIN, 1.0-V VOUT, 0-A, Skip Mode, fSW = 600 kHz)
Figure 8-9. Switching Node at Full Load (12-V VIN, 1.2-V VOUT, 6-A, Skip Mode, fSW = 600 kHz)
www.ti.com Performance Data and Typical Characteristic Curves
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8.7 Start Up
Figure 8-10. Start-Up Waveform (12-V VIN, 1.2-V VOUT, 6-A IOUT, 1-ms SS)
Figure 8-11. Pre-bias Start-Up Waveform (12-V VIN, 1.2-V VOUT, 0-A IOUT, 1-ms SS)
Performance Data and Typical Characteristic Curves www.ti.com
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8.8 Shut Down
Figure 8-12. Shut-Down Waveform (12-V VIN, 1.2-V VOUT, 0-A IOUT)
8.9 Over-Current Protection
Figure 8-13. Over-Current Protection Waveform ( 12-V VIN, 1.2-V VOUT, IOUT increases from 6 A to 7.8 A)
www.ti.com Performance Data and Typical Characteristic Curves
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8.10 Synchronization
Figure 8-14. Synchronization Waveform (12-V VIN, 1.2-V VOUT, 0-A IOUT, free-running frequency = 600
kHz, SYNC frequency = 750 kHz)
8.11 Bode Plot
Figure 8-15. Loop Gain (12-V VIN, 1.2-V VOUT, 6-A IOUT, Skip Mode, fSW = 600 kHz)
Performance Data and Typical Characteristic Curves www.ti.com
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8.12 Thermal Image
Figure 8-16. Thermal Image (12-V VIN, 1.2-V VOUT, 6-A IOUT, FCCM Mode, fSW = 600 kHz)
Figure 8-17. Thermal Image (12-V VIN, 1.2-V VOUT, 6-A IOUT, FCCM Mode, fSW = 1.00 MHz)
www.ti.com Performance Data and Typical Characteristic Curves
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9 EVM Assembly Drawing and PCB Layout
The following figures (Figure 9-1 through Figure 9-6) show the design of the TPS53313EVM-078 printed circuit
board. The EVM has been designed using 4 Layers, 2-oz copper circuit board.
Figure 9-1. TPS53313EVM-078 Top Layer Assembly Drawing (top view)
Figure 9-2. TPS53313EVM-078 Bottom Assembly Drawing (bottom view)
EVM Assembly Drawing and PCB Layout www.ti.com
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Figure 9-3. TPS53313EVM-078 Top Copper (top view)
Figure 9-4. TPS53313EVM-078 Layer 2 (top view)
www.ti.com EVM Assembly Drawing and PCB Layout
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Figure 9-5. TPS53313EVM-078 Layer 3 (top view)
Figure 9-6. TPS53313EVM-078 Bottom Layer (top view)
EVM Assembly Drawing and PCB Layout www.ti.com
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