Texas Instruments TPS563231EVM-032 User manual

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TPS563231EVM-032 3-A, Synchronous Step-down Converter Evaluation
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User's Guide
SLUUBT7A–July 2018–Revised December 2018
TPS563231EVM-032 3-A, Synchronous Step-down
Converter Evaluation Module
This user's guide contains information for the TPS563231 as well as support documentation for the
TPS563231EVM-032 evaluation module. Included are the performance specifications, schematic, and the
bill of materials of the TPS563231EVM-032.
Contents
1 Introduction ................................................................................................................... 2
2 Performance Specification Summary ..................................................................................... 2
3 Modifications.................................................................................................................. 3
3.1 Output Voltage Setpoint............................................................................................ 3
4 Test Setup and Results..................................................................................................... 4
4.1 Input/Output Connections.......................................................................................... 4
4.2 Start-Up Procedure................................................................................................. 4
4.3 Efficiency............................................................................................................. 5
4.4 Load Regulation..................................................................................................... 6
4.5 Line Regulation ..................................................................................................... 7
4.6 Load Transient Response ......................................................................................... 7
4.7 Output Voltage Ripple.............................................................................................. 8
4.8 Input Voltage Ripple................................................................................................ 9
4.9 Start-Up............................................................................................................. 10
4.10 Shut-Down ......................................................................................................... 11
5 Board Layout................................................................................................................ 12
5.1 Layout............................................................................................................... 12
6 Schematic, Bill of Materials, and Reference............................................................................ 14
6.1 Schematic .......................................................................................................... 14
6.2 List of Materials.................................................................................................... 15
6.3 Reference .......................................................................................................... 15
List of Figures
1 TPS563231EVM-032 Efficiency ........................................................................................... 5
2 TPS563231EVM-032 Light Load Efficiency.............................................................................. 5
3 TPS563231EVM-032 Load Regulation ................................................................................... 6
4 TPS563231EVM-032 Line Regulation.................................................................................... 7
5 TPS563231EVM-032 Load Transient Response, 25% to 75% Load Step .......................................... 7
6 TPS563231EVM-032 Output Voltage Ripple, IOUT = 3 A................................................................ 8
7 TPS563231EVM-032 Output Voltage Ripple, IOUT = 300 mA .......................................................... 8
8 TPS563231EVM-032 Output Voltage Ripple, IOUT = 0 mA ............................................................. 9
9 TPS563231EVM-032 Input Voltage Ripple, IOUT = 3 A.................................................................. 9
10 TPS563231EVM-032 Start-Up Relative to VIN.......................................................................... 10
11 TPS563231EVM-032 Start-Up Relative to EN ......................................................................... 10
12 TPS563231EVM-032 Shut-Down Relative to VIN ...................................................................... 11
13 TPS563231EVM-032 Shut-Down Relative to EN...................................................................... 11
14 Top Assembly............................................................................................................... 12
15 Top Layer ................................................................................................................... 13

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16 Bottom Layer................................................................................................................ 13
17 TPS563231EVM-032 Schematic Diagram.............................................................................. 14
List of Tables
1 Input Voltage and Output Current Summary............................................................................. 2
2 TPS563231EVM-032 Performance Specifications Summary.......................................................... 2
3 Output Voltages.............................................................................................................. 3
4 Connection and Test Points................................................................................................ 4
5 List of Materials............................................................................................................. 15
1 Introduction
The TPS563231 is a single, adaptive on-time, D-CAP3™ mode, synchronous buck converter requiring a
very low external component count. The D-CAP3 control circuit is optimized for low-ESR output capacitors
such as POSCAP, SP-CAP, or ceramic types and features fast transient response with no external
compensation. The switching frequency is internally set at a nominal 600 kHz and enters Advanced Eco-
mode in light load conditions. The high-side and low-side switching MOSFETs are incorporated inside the
TPS563231 package along with the gate-drive circuitry. The low drain-to-source on resistance of the
MOSFETs allows the TPS563231 to achieve high efficiencies and helps keep the junction temperature low
at high output currents. The TPS563231 dc/dc synchronous converter is designed to provide up to a 3-A
output from an input voltage source of 4.5 V to 17 V. The output voltage range is from 0.6 V to 7 V. Rated
input voltage and output current ranges for the evaluation module are given in Table 1.
The TPS563231EVM-032 evaluation module (EVM) is a single, synchronous buck converter providing 3.3
V at 3 A from 4.5-V to 17-V input. This user’s guide describes the TPS563231EVM-032 performance.
Table 1. Input Voltage and Output Current Summary
EVM INPUT VOLTAGE RANGE OUTPUT CURRENT RANGE
TPS563231EVM-032 VIN = 4.5 V to 17 V 0 A to 3 A
2 Performance Specification Summary
A summary of the TPS563231EVM-032 performance specifications is provided in Table 2. Specifications
are given for an input voltage of VIN = 12 V and an output voltage of 3.3 V, unless otherwise noted. The
ambient temperature is 25°C for all measurement, unless otherwise noted.
Table 2. TPS563231EVM-032 Performance Specifications Summary
SPECIFICATIONS TEST CONDITIONS MIN TYP MAX UNIT
Input voltage range (VIN) 4.5 12 17 V
CH1
Output voltage 3.3 V
Operating frequency VIN = 12 V, IO= 3 A 600 kHz
Output current range 0 3 A
Over current limit VIN = 12 V, LO= 3.3 µH A
Output ripple voltage VIN = 12 V, IO= 3 A 15 mVPP

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3 Modifications
These evaluation modules are designed to provide access to the features of the TPS563231. Some
modifications can be made to this module.
3.1 Output Voltage Setpoint
To change the output voltage of the EVMs, it is necessary to change the value of resistor R5. Changing
the value of R5 can change the output voltage above 0.6 V. The value of R5 for a specific output voltage
can be calculated using Equation 1.
(1)
Table 3 lists the R5 values for some common output voltages. Note that the values given in Table 3 are
standard values and not the exact value calculated using Table 3.
Table 3. Output Voltages
OUTPUT VOLTAGE
(V) R5 (kΩ)R6 (kΩ)
L1
(µH) C5 + C6 +C7
(µF)
Min Typ Max
1.0 6.65 10.0 1 1.5 4.7 20 - 68
1.05 7.5 10.0 1 1.5 4.7 20 - 68
1.2 10 10.0 1 1.5 4.7 20 - 68
1.5 15 10.0 1.5 2.2 4.7 20 - 68
1.8 20 10.0 1.5 2.2 4.7 20 - 68
2.5 31.6 10.0 2.2 3.3 4.7 20 - 68
3.3 45.3 10.0 2.2 3.3 4.7 20 - 68
5.0 73.2 10.0 3.3 4.7 4.7 20 - 68
6.5 98.3 10.0 3.3 4.7 4.7 20 - 68

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4 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS563231EVM-032. The section
also includes test results typical for the evaluation modules and efficiency, output load regulation, output
line regulation, load transient response, output voltage ripple, input voltage ripple, start-up, and switching
frequency.
4.1 Input/Output Connections
The TPS563231EVM-032 is provided with input/output connectors and test points as shown in Table 4. A
power supply capable of supplying 3 A must be connected to J1 through a pair of 20-AWG wires. The load
must be connected to J2 through a pair of 20-AWG wires. The maximum load current capability is 3 A.
Wire lengths must be minimized to reduce losses in the wires. Test point TP3 provides a place to monitor
the VIN input voltages with TP4 providing a convenient ground reference. TP9 is used to monitor the output
voltage with TP5 as the ground reference.
Table 4. Connection and Test Points
REFERENCE DESIGNATOR FUNCTION
J1 VIN (see Table 1 for VIN range)
J2 VOUT, 3.3 V at 3-A maximum
JP1 EN control. Shunt EN to GND to disable
TP1 VIN positive power point
TP2,TP11 GND power point
TP3 VIN positive monitor point
TP4,TP5,TP12,TP13 GND monitor test point
TP6 EN test point
TP7 Switch node test point
TP8 Test point for loop response measurements
TP9 VOUT positive monitor point
TP10 VOUT positive power point
4.2 Start-Up Procedure
1. Ensure that the jumper at JP1 (Enable control) pins 1 and 2 are covered to shunt EN to GND, disabling
the output.
2. Apply appropriate VIN voltage to VI (J1-2) and GND (J1-1).
3. Move the jumper at JP1 (Enable control) pins 1 and 2 (EN and GND) to enable the output.

Output Current - A
Efficiency - %
0.001 0.01 0.1 1 3
20
30
40
50
60
70
80
90
100
D02_
VIN = 5V
VIN = 12V
VIN = 17V
Output Current - A
Efficiency - %
0 0.5 1 1.5 2 2.5 3
20
30
40
50
60
70
80
90
100
D01_
VIN = 5V
VIN = 12V
VIN = 17V
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4.3 Efficiency
Figure 1 shows the efficiency for the TPS563231EVM-032 at an ambient temperature of 25°C.
Figure 1. TPS563231EVM-032 Efficiency
Figure 2 shows the efficiency at light loads for the TPS563231EVM-032 at an ambient temperature of
25°C.
Figure 2. TPS563231EVM-032 Light Load Efficiency

Output Current - A
Output Voltage Deviation - %
0 0.5 1 1.5 2 2.5 3
-2
-1.5
-1
-0.5
0
0.5
1
D03_
VIN = 5V
VIN = 12V
VIN = 17V
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4.4 Load Regulation
The load regulation for the TPS563231EVM-032 is shown in Figure 3.
Figure 3. TPS563231EVM-032 Load Regulation

VOUT = 100 mV / div (AC coupled)
IL = 1 A / div
Load Step = 0.75 A t2.25 A , Slew Rate = 500 mA / s
200 s / div
Input Voltage - V
Output Voltage Deviation - %
5 6 7 8 9 10 11 12 13 14 15 16 17
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
D04_
ILOAD = 0 A
ILOAD = 1.5 A
ILOAD = 3 A
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4.5 Line Regulation
The line regulation for the TPS563231EVM-032 is shown in Figure 4.
Figure 4. TPS563231EVM-032 Line Regulation
4.6 Load Transient Response
The TPS563231EVM-032 response to load transient is shown in Figure 5. The current steps and slew
rates are indicated in the figures. Total peak-to-peak voltage variation is as shown.
Figure 5. TPS563231EVM-032 Load Transient Response, 25% to 75% Load Step

Vout = 20 mV / div (AC coupled)
SW = 5 V / div
1 s / div
Vout = 20 mV / div (AC coupled)
SW = 5 V / div
1 s / div
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4.7 Output Voltage Ripple
The TPS563231EVM-032 output voltage ripple is shown in Figure 6,Figure 7, and Figure 8. The output
currents are as indicated.
Figure 6. TPS563231EVM-032 Output Voltage Ripple, IOUT =3A
Figure 7. TPS563231EVM-032 Output Voltage Ripple, IOUT = 300 mA

Vin = 50 mV / div (AC coupled)
SW = 5 V / div
1 s / div
Vout = 20 mV / div (AC coupled)
SW = 5 V / div
1 s / div
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Figure 8. TPS563231EVM-032 Output Voltage Ripple, IOUT = 0 mA
4.8 Input Voltage Ripple
The TPS563231EVM-032 input voltage ripple is shown in Figure 9. The output current is as indicated.
Figure 9. TPS563231EVM-032 Input Voltage Ripple, IOUT =3A

Vin = 5 V / div
Vout = 1 V / div
EN = 3 V / div
1 ms / div
Vin = 5 V / div
Vout = 1 V / div
EN = 3 V / div
2 ms / div
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4.9 Start-Up
The TPS563231EVM-032 start-up waveform relative to VIN is shown in Figure 10.Load=2Ωresistive.
Figure 10. TPS563231EVM-032 Start-Up Relative to VIN
The TPS563231EVM-032 start-up waveform relative to enable (EN) is shown in Figure 11.Load=2Ω
resistive.
Figure 11. TPS563231EVM-032 Start-Up Relative to EN