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Table of Contents
User’s Guide
TPS51315 Step-Down Converter Evaluation Module User's
Guide
ABSTRACT
The TPS51315-EVM evaluation module (EVM), is a D-CAP™ mode, 10-A synchronous buck controller with
integrated MOSFETs providing a fixed 1.5-V output at up to 10 A from a 12-V input bus. The EVM uses the
TPS51315 step down buck controller.
Table of Contents
1 Introduction.............................................................................................................................................................................2
2 Description.............................................................................................................................................................................. 2
3 Typical Applications............................................................................................................................................................... 2
4 Features...................................................................................................................................................................................2
5 Electrical Performance Specifications................................................................................................................................. 2
6 Schematic................................................................................................................................................................................3
7 Test Setup................................................................................................................................................................................4
8 Test Procedure........................................................................................................................................................................ 6
9 Performance Data and Typical Characteristic Curves........................................................................................................ 7
10 EVM Assembly Drawing and PCB layout........................................................................................................................... 9
11 List of Materials................................................................................................................................................................... 11
12 References.......................................................................................................................................................................... 12
13 Revision History................................................................................................................................................................. 12
Trademarks
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Introduction
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1 Introduction
The TPS51315-EVM evaluation module (EVM), is a D-CAP™ mode, 10-A synchronous buck controller with
integrated MOSFETs providing a fixed 1.5-V output at up to 10 A from a 12-V input bus. The EVM uses the
TPS51315 step down buck controller.
2 Description
The TPS51315-EVM is designed to use a regulated 12-V bus to produce a regulated 1.5-V output at up to 10
A of the load current. The TPS51315-EVM is designed to demonstrate the TPS51315 in a typical low-voltage
application while providing a number of test points to evaluate the performance of the TPS51315.
3 Typical Applications
•
•
High current system converters for server and desktop power
Point of load non-isolated DC-DC converters for telecom and datacom application
4 Features
The TPS51315-EVM features include
•
•
•
•
•
•
10-A DC Steady State Current
Support pre-bias output voltage start-up
300-kHz switching frequency
J4 for enable function
Convenient test points for probing critical waveforms and loop response testing
J5 for hiccup overcurrent protection option
5 Electrical Performance Specifications
Table 5-1 gives the EVM performance specifications.
Table 5-1. Performance Specification Summary
SPECIFICATION
TEST CONDITIONS
MIN
TYP
MAX
4.5
12
14
UNITS
INPUT CHARACTERISTICS
VIN
Input voltage range
V
IIN(max)
Maximum input current
VIN = 4.5 V, IO = 10 A
3.9
A
IIN
No load input current
VIN = 14 V, IO = 0 A
30
mA
OUTPUT CHARACTERISTICS
VOUT
Output voltage
VREG
Output voltage regulation
VRIPPLE
Output voltage ripple
1.5
V
Line regulation, 10 V ≤ VIN ≤ 14 V
0.3%
Load regulation, VIN = 12 V, 0 A ≤ IO ≤ 10 A
0.5%
VIN = 12 V, IO = 10 A
Ouptut load current
0
Output overcurrent threshold
30
mVpp
10
A
15
A
300
kHz
SYSTEMS CHARACTERISTICS
2
fSW
Switching frequency
η
Peak efficiency
VIN = 12 V, VOUT = 1.5 V, IO = 4 A
η
Full load efficiency
VIN = 12 V, VOUT = 1.5 V, IO = 10 A
TA
Operating ambient temperature
90.29%
87%
25
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Schematic
6 Schematic
Figure 6-1. TPS51315-EVM Schematic Diagram
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Test Setup
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7 Test Setup
7.1 Test Equipment
7.1.1 Voltage Source
The input voltage source VIN should be a variable DC source between 0 V and 14 V, capable of supplying 10
Adc. Connect VIN to J1 as shown in Figure 7-2.
7.1.2 Multimeters
A voltmeter between 0 V and 15 V should be used to measure VIN at TP6 (VIN) and TP7 (GND). A voltmeter
between 0 V and 5 V for output voltage measurement at TP4 (VOUT) and TP5 (GND). A current meter between 0
A and 10 A (A1) as shown in Figure 7-2 is used for input current measurements.
7.1.3 Output Load
The output load should be an electronic constant resistance mode load capable of between 0 Adc and 20 Adc at
1.5 V.
7.1.4 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, 2-μs/division horizontal resolution, 20-mV/division vertical
resolution. Test points TP4 and TP5 can be used to measure the output ripple voltage. Place the oscilloscope
probe tip through TP4 and rest the ground barrel on TP5 as shown in Figure 7-1. Using a leaded ground
connection may induce additional noise due to the large ground loop.
Metal Ground Barrel
Probe Tip
TP4
TP5
Figure 7-1. Tip and Barrel Measurement for VOUT Ripple
7.1.5 Fan
Some of the components in this EVM may approach temperatures of 60°C during operating. A small fan capable
of 200-400 LFM is recommended to reduce component temperatures while the EVM is operating. The EVM
should not be probed while the fan is not running.
7.1.6 Recommended Wire Gauge
For 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). For J2 to LOAD the minimum recommended wire size is 1 ×
AWG #14, with the total length of wire less than 4 feet (2 feet output, 2 feet return).
4
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Test Setup
7.2 Recommended Test Setup
Figure 7-2 is the recommended test set up to evaluate the TPS51315-EVM. 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.
FAN
V2
Load
+
DC Source
Vin +
V1
A1
Figure 7-2. TPS51315-EVM Recommended Test Set Up
7.2.1 Configuration
1. EN-PSV J4 setting.
a. No Jumper actives PWM mode only.
b. Jumper on pin1 and pin2 actives auto-skip mode
c. Jumper on pin2 and pin3 disables the controller. (Default setting)
2. OCP option J5 setting (only between 10 VIN and 14 VIN)
a. No Jumper actives latch-off OCP. (Default setting)
b. Jumper on J5 actives hiccup OCP. Hiccup OCP is not recommended for sustained over load.
7.2.2 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 as shown in Figure 7-2.
2. Connect a voltmeter V1 at TP6(VIN) and TP7 (GND) to measure the input voltage.
7.2.3 Output Connections
1. Connect Load to J2 and set the load to constant resistance mode to sink 0 Adc before VIN is applied.
2. Connect a voltmeter V2 at TP4 (VOUT) and TP5 (GND) to measure the output voltage.
7.2.4 Other Connections
Place a fan as shown in Figure 7-2 and turn on, making sure air is flowing across the EVM.
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Test Procedure
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8 Test Procedure
8.1 Line/Load Regulation and Efficiency Measurement Procedure
1.
2.
3.
4.
5.
6.
7.
8.
9.
Ensure that the load is set to constant resistance mode and to sink 0 Adc.
Ensure that the jumper provided in the EVM to short on pin 2 and pin 3 of J4 before VIN is applied.
Increase VIN from 0 V to 12 V, using V1 to measure input voltage.
Remove the jumper on J4 to enable the controller.
a. No jumper on J4 to active PWM mode but disable auto-skip mode.
b. Jumper short on pin 1 and pin 2 of J4 to active PWM mode and enable auto-skip mode.
Vary load from between 0 VAdc and 10Adc, VOUT should remain in load regulation.
Vary VIN from 10 V to 14 V. VOUT should remain in line regulation.
Put the jumper on pin 2 and pin 3 of J4 to disable the controller.
Decrease the load to 0 A.
Decrease VIN to 0 V.
8.2 List of Test Points
Table 8-1. Test Point Functions
TEST POINTS
NAME
DESCRIPTION
TP1
GND
GND for 5VBIAS
TP2
5VBIAS
5VBIAS
TP3
SW
Monitor switch node voltage
TP4
VOUT
VOUT
TP5
GND
GND for Vout
TP6
VIN
VIN
TP7
GND
GND for VIN
TP8
PGOOD
Power Good
TP9
EN_PSV
Enable
TP10
5Vin
External 5VIN
TP11
GND
GND for external 5VIN
TP12
GND
GND
8.3 Equipment Shutown Procedure
1. Shut down load.
2. Shut down VIN.
3. Shut down fan.
6
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Performance Data and Typical Characteristic Curves
9 Performance Data and Typical Characteristic Curves
Figure 9-1 through Figure 9-10 present typical performance curves for the TPS51315-EVM
EFFICIENCY
vs
OUTPUT CURRENT
100
90
1.540
Enable
Auto-skip
VOUT – Output Voltage – V
70
h – Efficiency – %
Auto-Skip
Disable Enable VIN (V)
4.5
12
14
1.535
80
60
50
Disable
Auto-skip
40
30
VIN (V)
20
1.550
1.525
1.520
1.515
4.5
12
14
10
0
0.001
OUTPUT VOLTAGE
vs
OUTPUT CURRENT
1.510
0.01
0.1
1
10
0
1
IOUT – Output Current – A
2
3
4
5
6
7
8
9
10
IOUT – Output Current – A
Figure 9-1. TPS51315-EVM Efficiency
Figure 9-2. TPS51315-EVM Load Regulation
Figure 9-3. 0-A to 10-A Load Transient RiseX X
Figure 9-4. 0-A to 10-A Load Transient Fall
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Performance Data and Typical Characteristic Curves
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Figure 9-5. Output RippleX X
Figure 9-6. Enable Turn-OffX X
Figure 9-7. Enable Turn-OnX X
Figure 9-8. Switching Node
Figure 9-9. Overcurrent Protection (OCP) Latch-Off
Figure 9-10. Overcurrent Protection (OCP) Hiccup
.
.
8
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EVM Assembly Drawing and PCB layout
10 EVM Assembly Drawing and PCB layout
Figure 10-1 through Figure 10-8 show the design of the TPS51315-EVM printed circuit board. The EVM has
been designed using 6 layers on a 2-oz. copper circuit board.
Figure 10-1. Top Layer Assembly Drawing (Top
View)
Figure 10-2. Bottom Assembly Drawing (Bottom
View)
Figure 10-3. Top Copper (Top View)
Figure 10-4. Internal Layer 1
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EVM Assembly Drawing and PCB layout
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Figure 10-5. Internal Layer 2
Figure 10-6. Internal Layer 3
Figure 10-7. Internal Layer 4
Figure 10-8. Bottom Copper (Top View)
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List of Materials
11 List of Materials
List of materials for the TPS51315-EVM.
Table 11-1. TPS51315-EVM List of Materials
REFERENCE
DESIGNATOR
QTY
C13, C14, C15, C16,
C17, C18
6
Capacitor, Ceramic, 22 μF, 16V, X5R, 20%, 1210
MuRata
GRM32ER61C226KE20L
C1
1
Capacitor, Ceramic, 22 nF, 50V, X7R, 10%, 0603
STD
STD
C10, C2, C3
3
Capacitor, Ceramic, 10 μF, 16V, X5R, 10%, 0805
STD
STD
C11
1
Capacitor, Ceramic, 4.7 μF, 10V, X5R, 10%, 0603
STD
STD
C19, C4, C12
3
Capacitor, Ceramic, 1 μF, 16V, X7R, 10%, 0603
STD
STD
C20, C5
2
Capacitor, Ceramic, 0.1 μF, 25V, X7R, 10%, 0603
STD
STD
C21
1
Capacitor, Ceramic, 0.56 μF, 25V, X7R, 10%, 0603
STD
STD
C22, C24
2
Capacitor, Ceramic, 1000 pF, 25V, X7R, 10%, 0603
STD
STD
C6, C7, C8, C9
4
Capacitor, Ceramic, 100 μF, 6.3V, X5R, 20%, 1210
MuRata
GRM32ER60J107ME20L
MBR0530T
DESCRIPTION
MFR
PART NUMBER
D1
1
Diode, Schottky, 0.5 A, 30 V
On
Semiconductor
L1
1
Inductor, SMT, 1.0 μH, 13 A, 0.0023 Ω
ICE Components IN06155
Q1
1
Bipolar, N-channel, 40 V, 200 mA, 350 mW, SOT-23
On
Semiconductor
MMBT3904LT1
R1
1
Resistor, Chip, 15 kΩ 1/16W, 1%, 0603
STD
STD
R10
1
Resistor, Chip, 120 kΩ, 1/16W, 1%, 0603
STD
STD
R11
1
Resistor, Chip, 21.5 kΩ, 1/16W, 1%, 0603
STD
STD
R12
1
Resistor, Chip, 0 Ω, 1/16W, 5%, 0603
STD
STD
R2, R6, R7
3
Resistor, Chip, 10 kΩ, 1/16W, 1%, 0603
STD
STD
R3
1
Resistor, Chip, 9.09 kΩ, 1/16W, 1%, 0603
STD
STD
R4
1
Resistor, Chip, 274 kΩ, 1/16W, 1%, 0603
STD
STD
R5
1
Resistor, Chip, 499 Ω, 1/16W, 1%, 0603
STD
STD
R8
1
Resistor, Chip, 100 Ω, 1/16W, 1%, 0603
STD
STD
R9
1
Resistor, Chip, 100 kΩ, 1/16W, 1%, 0603
STD
STD
U1
1
IC, Integrated LDO with switch-over circuit, DGS10
Texas
Instruments
TPS51103DRC
U2
1
IC, Synchronous PWM controller with integrated
switcher,QFN-40
Texas
Instruments
TPS51315RGF
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References
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12 References
Texas Instruments, TPS51315 10-A Step-Down Synchronous Switcher with Integrated MOSFETs data sheet
13 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (February 2012) to Revision C (January 2022)
Page
• Updated the numbering format for tables, figures, and cross-references throughout the document. ................2
• Updated the user's guide title............................................................................................................................. 2
12
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