Texas Instruments TPS53015 User manual

User’s Guide
TPS53015 Buck Controller Evaluation Module User's
Guide
Table of Contents
1 Introduction.............................................................................................................................................................................2
2 Description.............................................................................................................................................................................. 2
2.1 Typical Applications............................................................................................................................................................2
2.2 Features............................................................................................................................................................................. 2
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........................................................................................................................................................................ 6
6.1 Enable/Disable Switch S1.................................................................................................................................................. 6
7 Test Procedure........................................................................................................................................................................ 7
7.1 Line/Load Regulation and Efficiency Measurement Procedure......................................................................................... 7
7.2 List of Test Points............................................................................................................................................................... 7
7.3 Equipment Shutdown......................................................................................................................................................... 7
8 Performance Data and Typical Characteristic Curves........................................................................................................ 8
8.1 Efficiency............................................................................................................................................................................8
8.2 Load Regulation................................................................................................................................................................. 8
8.3 Line Regulation.................................................................................................................................................................. 9
8.4 Load Transient................................................................................................................................................................... 9
8.5 Output Ripple................................................................................................................................................................... 10
8.6 Switching Node.................................................................................................................................................................11
8.7 Enable Start-Up................................................................................................................................................................12
8.8 Disable............................................................................................................................................................................. 12
8.9 Thermal Image................................................................................................................................................................. 13
9 EVM Assembly Drawing and PCB Layout.......................................................................................................................... 14
10 List of Materials.................................................................................................................................................................. 17
11 Revision History..................................................................................................................................................................17
Trademarks
D-CAP2™ is a trademark of Texas Instruments.
Eco-mode™ is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
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1 Introduction
The TPS53015EVM-126 evaluation module (EVM) presents an easy-to-use reference design for a typical point-
of-load application in a standalone module using the TPS53015 controller in cost-sensitive applications.
2 Description
The TPS53015EVM-126 provides the user with a convenient way to evaluate the TPS53015 D-CAP2™ mode
control in a cost-sensitive application. Providing a 1.05-V output at up to 8 A from a loosely regulated 12-V (8
V–22 V) source, the TPS53015EVM-126 is designed to demonstrate the TPS53015 in a typical point-of-load
application while providing a number of test points to evaluate the performance of the TPS53015.
2.1 Typical Applications
• Point-of-load regulations in low-power systems for a wide range of applications
– Digital TV power supply
– Network home terminals
– Digital set top box (STB)
– DVD player/recorder
– Game consoles and others
2.2 Features
The TPS53015EVM-126 features:
• D-CAP2™ Mode Control
– Fast Transient Response
– No External Parts Required For Loop Compensation
– Compatible with Ceramic Output Capacitors
• Auto-Skip Eco-mode™ for High Efficiency at Light load
• 500-kHz switching frequency
• Power Good Indication
• Non-Sinking Pre-Biased Soft Start
• Cycle-by-Cycle Over-Current Limit
• Over-current, over-voltage, under-voltage and over-temperature protections
• Convenient test points for probing critical waveforms
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3 Electrical Performance Specifications
Table 3-1. TPS53015EVM-126 Electrical Performance Specifications
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input Characteristics
Voltage range VIN 8.0 12 22 V
Maximum input current VIN = 12 V, IOUT = 8 A 0.9 A
No load input current VIN = 12 V, IOUT = 0 A 0.6 mA
Output Characteristics
Output voltage 1.05 V
Output voltage regulation Setpoint accuracy
(VIN = 12 V, IOUT = 8 A)
–2% 2%
Line regulation
(VIN = 8.0 V–22 V, IOUT = 8 A)
1%
Load regulation
(VIN = 12 V, IOUT = 0 A – 8 A)
1.5%
Output voltage ripple VIN = 12 V, IOUT = 8 A 20 mVpp
Output load current 0 8.0 A
Over current limit VIN = 12 V 11
Systems Characteristics
Switching frequency 500 kHz
Peak efficiency VIN = 12 V, IOUT = 3.2 A 86.5%
Full load efficiency VIN = 12 V, IOUT = 8.0 A 81.4%
Operating temperature 25 °C
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4 Schematic
Notes:
NOT POPULATED
VIN
GND
8V - 22V
VOUT
GND
1.05V/8A
VIN
GND
VOUT
GND
EN SW
Enable
GND
1
Disable (Default)
Enable Circuitry
VREG5
1
11
1
PG
TP5
R5
5.11
C5
0.1uF
TP8 TP7
TP2
L1
1.5uH C7
22uF
TP6
1
2
J2
1
2
J1
C6
22uF
C8
R9
3.01
C12
1000pF
TP1
1VFB 2PG
3VREG5 4EN 5VIN 6
PGND
7
DRVL
8
SW
9
DRVH
10
VBST
U1
TPS53015DGS
C1
10uF
C2
10uF
C3
10uF
4
5
6
S1
SW_G12AP
TP9
G
S DQ1
CSD17507Q5A
G
S D
Q2
CSD17507Q5A
R2
10.0
C13
0.1uF
R6
1.00k
R8
1.00k C11
4.7uF C10
R4
R10
15.4k
TP4
R7
2.05
D1
BAT54XV2T1
R1
8.66k
R3
23.7k
TP3
TP10
R11
140
SH1
C9
C4
VIN
VOUT
PWRGND
PWRGND
AGND
VIN
VIN
VOUT
Figure 4-1. TPS53015EVM-126 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 30-V variable DC source capable of supplying 2 ADC.
Connect VIN to J1 as shown in Figure 5-2.
Multimeters:
•V1: VIN at TP1 (VIN) and TP2 (GND), 0-V to 30-V voltmeter
•V2: VOUT at TP7 (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 8 ADC
at 1.05 V.
Oscilloscope: A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope
should be set for the following:
• 1-MΩ impedance
• 20-MHz bandwidth
• AC coupling
• 1-µs/division horizontal resolution
• 50-mV/division vertical resolution
Test points TP7 and TP8 can be used to measure the output ripple voltage by placing the oscilloscope probe tip
through TP7 and holding the ground barrel on TP8 as shown in Figure 5-1. Using a leaded ground connection
can induce additional noise due to the large ground loop.
TP7 TP8
Figure 5-1. Tip and Barrel Measurement for VOUT Ripple
Fan: Some of the components in this EVM can approach temperatures of 85°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 J1: The recommended wire size is 1x AWG #16 per input connection, with the total length of wire less
than four feet (2-feet input, 2-feet return).
•J2 to LOAD: The minimum recommended wire size is 1x AWG #16, with the total length of wire less than
four feet (2-feet output, 2-feet return)
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5.2 Recommended Test Setup
Figure 5-2 is the recommended test setup to evaluate the TPS53015EVM-126. 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. TPS53015EVM-126 Recommended Test Setup
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 J1 to measure the input current.
• Connect a voltmeter V1 at TP1 (VIN) and TP2 (GND) to measure the input voltage.
Output Connections:
• Connect Load to J2 and set load to constant resistance mode to sink 0 ADC before VIN is applied.
• Connect a voltmeter V2 at TP7 (VOUT) and TP8 (GND) to measure the output voltage.
Other Connections: Place a fan as shown in Figure 5-2 and turn on, making sure air is flowing across the EVM.
6 Configurations
6.1 Enable/Disable Switch S1
The TPS53015EVM-126 is equipped with a switch (S1) to drive the EN pin of the TPS53015. When S1 is
in the Enable position, EN is connected to VIN, and the TPS53015 is enabled and generates a regulated
1.05-V output. When S1 is in the Disable position, EN is connected to GND, and the TPS53015 enters a high
impedance output state.
Default setting: Set S1 to the Disabled position to disable the controller.
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7 Test Procedure
7.1 Line/Load Regulation and Efficiency Measurement Procedure
1. Set up the 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 the switch S1 is set per Section 6.
4. Increase VIN from 0 V to 12 V. Using V1 to measure VIN voltage.
5. Set the switch S1 to Enable position to enable the controller.
6. Use V2 to measure VOUT voltage and A1 to measure VIN current.
7. Vary load from 0 A–8 ADC. VOUT should remain in load regulation.
8. Vary VIN from 8.0 V to 22 V. VOUT should remain in line regulation.
9. Set the switch S1 to Disable position to disable the controller.
10. Decrease load to 0 A.
11. Decrease VIN to 0 V.
7.2 List of Test Points
Table 7-1. Test Point Functions
TEST POINTS NAME DESCRIPTION
TP1 VIN Input voltage
TP2 GND GND
TP3 VREG5 Output of 5-V linear regulator
TP4 PG Power good
TP5 EN Enable pin
TP6 SW Switching node
TP7 VOUT Output voltage
TP8 GND GND
TP9 GND GND
TP10 GND GND
7.3 Equipment Shutdown
1. Shut down VIN.
2. Shut down Load.
3. Shut down FAN.
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8 Performance Data and Typical Characteristic Curves
Figure 8-1 through Figure 8-11 present typical performance curves for TPS53015EVM-126.
8.1 Efficiency
0
10
20
30
40
50
60
70
80
90
100
0.001 0.010 0.100 1.000 10.000
ILOAD - Load Current - A
Efficiency - %
VIN = 8 V
VIN = 12 V
VIN = 22 V
Figure 8-1. Efficiency
8.2 Load Regulation
1
1.02
1.04
1.06
1.08
1.1
0.001 0.010 0.100 1.000 10.000
ILOAD - Load Current - A
VOUT - Output Voltage - V
VIN = 8 V
VIN = 12 V
VIN = 22 V
Figure 8-2. Load Regulation
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8.3 Line Regulation
1
1.02
1.04
1.06
1.08
1.1
8 10 12 14 16 18 20 22
VIN - Input Voltage - V
VOUT - Output Voltage - V
IOUT = 8 A
Figure 8-3. Line Regulation
8.4 Load Transient
Figure 8-4. Output Load 0-A to 8-A Transient (12-V VIN, 1.05-V VOUT)
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8.5 Output Ripple
Figure 8-5. Output Ripple at No Load (12-V VIN, 1.05-V VOUT, 0 A)
Figure 8-6. Output Ripple at Full Load (12-V VIN, 1.05-V VOUT, 8 A)
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8.6 Switching Node
Figure 8-7. Switching Node at No Load (12-V VIN, 1.05-V VOUT, 0 A)
Figure 8-8. Switching Node at Full Load (12-V VIN, 1.05-V VOUT, 8 A)
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8.7 Enable Start-Up
Figure 8-9. Start-Up Waveform (12-V VIN, 1.05-V VOUT, 8-A IOUT)
8.8 Disable
Figure 8-10. Shutdown Waveform (12-V VIN, 1.05-V VOUT, 8-A IOUT)
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8.9 Thermal Image
Figure 8-11. Thermal Image (22-V VIN, 1.05-V VOUT, 8-A IOUT, no Air Flow)
Note
The hottest spot is the surface of snubber resistor and power MOSFET, not the surface of TPS53015
controller device.
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9 EVM Assembly Drawing and PCB Layout
The following figures (Figure 9-1 through Figure 9-5) show the design of the TPS53015EVM-126 printed circuit
board. The EVM has been designed using a 4-layer, 2-ounce copper circuit board.
Figure 9-1. TPS53015EVM-126 Top Layer Assembly Drawing (Top View)
Figure 9-2. TPS53015EVM-126 Top Copper (Top View)
EVM Assembly Drawing and PCB Layout www.ti.com
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Figure 9-3. TPS53015EVM-126 Layer 2 (Top View)
Figure 9-4. TPS53015EVM-126 Layer 3 (Top View)
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Figure 9-5. TPS53015EVM-126 Bottom Layer (Top View)
EVM Assembly Drawing and PCB Layout www.ti.com
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10 List of Materials
The EVM components list according to the schematic shown in Figure 4-1.
Table 10-1. TPS53015EVM-126 List of Materials
QTY REF DES DESCRIPTION PART NUMBER MFR
3 C1, C2, C3 Capacitor, ceramic, 35 V, X5R, 20%, 10 µF, 1210 Std Std
0 C4 Capacitor, ceramic, 35 V, X7R, 10%, 1 µF, 0603 Std Std
1 C5 Capacitor, ceramic, 10 V, X7R, 10%, 0.1 µF, 0603 Std Std
2 C6, C7 Capacitor, ceramic, 10 V, X5R, 20%, 22 µF, 1206 Std Std
0 C8, C9 Capacitor, ceramic, 10 V, X5R, 20%, 22 µF, 1206 Std Std
0 C10 Capacitor, ceramic, 10 V, X7R, 10%, 0.01 µF, 0603 Std Std
1 C11 Capacitor, ceramic, 10 V, X7R, 10%, 4.7 µF, 0603 Std Std
1 C12 Capacitor, ceramic, 50 V, X7R, 10%, 1000 pF, 0603 Std Std
1 C13 Capacitor, ceramic, 50 V, X7R, 10%, 0.1 µF, 0603 Std Std
1 D1 Diode, Schottky, 10 mA, 30 V, SOD523 BAT54XV2T1G On Semi
2 J1, J2 Connector, 15 A, 300 V, male 2 pole, 5.08 mm, 9 mm × 12
mm
ED120/2DS On Shore Tech
1 L1 Inductor, 11 A, 6 mΩ, ±20%, 1.5 µH, 6.6 mm × 7 mm PCMB065T-1R5MS Cyntec
2 Q1, Q2(1)
MOSFET, N-channel, 30 V, 13 A, 11.8 mΩ, SON, 5 mm × 6
mm CSD17507Q5A
TI
MOSFET, N-channel, 30 V, 14 A, 9.0 mΩ, SON, 5 mm × 6
mm CSD17551Q5A
1 R1 Resistor, chip, 1/10 W, 1%, 8.66 kΩ, 0603 Std Std
1 R2 Resistor, chip, 1/10 W, 1%, 10.0 Ω, 0603 Std Std
1 R3 Resistor, Chip, 1/10 W, 1%, 23.7 kΩ, 0603 Std Std
1 R4 Resistor, chip, 1/10 W, 1%, 100 kΩ, 0603 Std Std
1 R5 Resistor, chip, 1/10 W, 1%, 5.11 Ω, 0603 Std Std
2 R6, R8 Resistor, chip, 1/10 W, 1%, 1.00 kΩ, 0603 Std Std
1 R7 Resistor, chip, 1/10 W, 1%, 2.05 Ω, 0603 Std Std
1 R9 Resistor, chip, 1/4 W, 1%, 3.01 Ω, 0805 Std Std
1 R10 Resistor, chip, 1/10 W, 1%, 15.4 kΩ, 0603 Std Std
1 R11 Resistor, chip, 1/10 W, 1%, 140 Ω, 0603 Std Std
1 S1 Switch, on-none-on, 0.28 inch × 0.18 inch G12AP-RO NKK
4 TP1, TP3, TP6,
TP7
Test point, red, thru hole, 0.125 inch × 0.125 inch 5010 Keystone
4 TP2, TP8, TP9,
TP10
Test point, black, thru hole, 0.125 inch × 0.125 inch 5011 Keystone
2 TP4, TP5 Test point, white, thru hole, 0.125 inch × 0.125 inch 5012 Keystone
1 U1 IC, Single Synchronous Step-Down Controller, VSSOP TPS53015DGS TI
1 -- PCB, 2.4 inch × 1.5 inch × 0.062 inch PWR126 TI
(1) The CSD17551Q5A can be used as alternate part to the CSD17507Q5A.
11 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision * (June 2012) to Revision A (December 2021) Page
• Updated the numbering format for tables, figures, and cross-references throughout the document. ................2
• Updated the user's guide title............................................................................................................................. 2
• Edited user's guide for clarity..............................................................................................................................2
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