Texas Instruments TPS563203 Manual de usuario
User’s Guide
TPS563203 and TPS563206 Step-Down Converter
Evaluation Module User's Guide
Table of Contents
1 Introduction.............................................................................................................................................................................2
2 Performance Specification Summary................................................................................................................................... 2
3 Output Voltage Setpoint......................................................................................................................................................... 3
4 Test Setup and Results.......................................................................................................................................................... 3
4.1 Input, Output Connections................................................................................................................................................. 4
4.2 Start-Up Procedure............................................................................................................................................................ 5
4.3 Efficiency............................................................................................................................................................................5
4.4 Load Regulation................................................................................................................................................................. 6
4.5 Line Regulation.................................................................................................................................................................. 7
4.6 Load Transient Response.................................................................................................................................................. 8
4.7 Start-Up..............................................................................................................................................................................9
4.8 Shutdown......................................................................................................................................................................... 10
4.9 Output Voltage Ripple.......................................................................................................................................................11
5 Board Layout.........................................................................................................................................................................12
5.1 Layout.............................................................................................................................................................................. 12
6 Schematic, List of Materials, and Reference......................................................................................................................14
6.1 Schematic........................................................................................................................................................................ 14
6.2 List of Materials................................................................................................................................................................ 15
6.3 Reference.........................................................................................................................................................................15
Trademarks
D-CAP3™ is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
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1 Introduction
In light-load conditions, the TPS563203 operates in Eco-mode to enable higher efficiency by varying its
switching frequency, the TPS563206 operates in FCCM to maintain constant switching frequency. The main
difference is at light loading, but the other behaviors are similar. This user's guide mainly introduces the
TPS563203 and includes some TPS563206 features that are different from the TPS563203.
The TPS56320x is a single, adaptive on-time, D-CAP3™ control mode, synchronous buck converter that requires
a very low external component count. The D-CAP3 control mode 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 600KHz. The high-side and low-side
switching MOSFETs are incorporated inside the TPS56320x package along with the gate-drive circuitry. The low
drain-to-source on resistance of the MOSFETs and fast switching slew rate allow the TPS56320x to achieve
high efficiency and help keep the junction temperature low at high output currents. The TPS56320x DC/DC
synchronous converter is designed to support up to a 3-A continuous current from an input voltage source of 4.2
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 1-1.
The TPS56320xEVM evaluation module (EVM) is a single, synchronous buck converter providing 1.05 V at 3 A
from 4.2-V to 17-V input. This user’s guide describes the TPS56320xEVM performance.
Table 1-1. Input Voltage and Output Current Summary
EVM INPUT VOLTAGE (VIN) RANGE OUTPUT CURRENT (IOUT)
RANGE
TPS563203EVM VIN = 4.2 V to 17 V 0 A to 3 A
TPS563206EVM VIN = 4.2 V to 17 V 0 A to 3 A
2 Performance Specification Summary
A summary of the TPS563203EVM performance specifications is provided in Table 2-1. Specifications are given
for an input voltage of VIN = 12 V and an output voltage of 1.05 V, unless otherwise noted. The ambient
temperature is 25°C for all measurement, unless otherwise noted.
Table 2-1. Performance Specifications Summary
SPECIFICATIONS TEST CONDITIONS MIN TYP MAX UNIT
Input voltage range 4.2 12 17 V
Output voltage set point 1.05 V
Operating frequency VIN = 12 V, IO = 3 A 600 KHz
Output current range 0 3 A
Over current limit VIN = 12 V, LO = 2.2 µH 3.9 A
Output ripple voltage VIN = 12 V, IO = 3 A 11 mVPP
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3 Output Voltage Setpoint
The output voltage of the EVM can be selected by changing the value of resistor R4 (RUPPER) and R6 (RLOWER).
The value of R4 for a specific output voltage can be calculated using Equation 1. The output voltage is set with a
resistor divider from the output node to the FB pin. TI recommends using 1% tolerance or better divider resistors.
Start with a 10 kΩ or 30 kΩ for R6 (RFBB) and use Equation 1 to calculate R4 (RFBT) . To improve efficiency at
light loads, consider using larger value resistors. If the values are too high, the regulator is more susceptible to
noise and voltage errors from the FB input current are noticeable.
VOUT = 0 . 6 × 1 +
R4
R6(1)
4 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS563203EVM. The section also includes
test results typical for the evaluation modules and the following:
• Efficiency
• Output load regulation
• Output line regulation
• Load transient response
• Output voltage ripple
• Start-up
• Shutdown
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4.1 Input, Output Connections
The TPS563203EVM is provided with input, output connectors and test points as shown in Table 4-1. Figure 4-1
shows connectors and jumpers placement on TPS563203EVM board.
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 TP2 provides a place to monitor the VIN input
voltages with TP6 providing a convenient ground reference. TP3 is used to monitor the output voltage with TP10
as the ground reference.
Figure 4-1. TPS563203EVM Connectors and Jumpers Placement
Table 4-1. Connection and Test Points
REFERENCE DESIGNATOR FUNCTION
J1 VIN (see Table 1-1 for VIN range)
J2 VOUT, 1.05 V at 3-A maximum
JP1 EN control. Shunt EN to GND to disable
TP1 VIN positive power point
TP2 VIN positive monitor point
TP3 VOUT positive monitor point
TP4 VOUT positive power point
TP5, TP7 GND power point
TP6, TP10, TP12, TP13 GND monitor point
TP8 Switch node test point
TP9 EN test point
TP11 Test point for loop response measurements
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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 input voltage to VIN (J1-2) and GND (J1-1).
3. Move the jumper at J1 (Enable control) pin 2 and 1 (EN and GND) to enable the output.
4.3 Efficiency
Figure 4-2 shows the efficiency for the TPS563203EVM at an ambient temperature of 25°C. Figure 4-3 shows
the efficiency for the TPS563206EVM at an ambient temperature of 25°C.
IOUT(A)
Efficiency
0.001 0.005 0.02 0.05 0.1 0.2 0.5 1 2 3
0
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
VIN=4.2V
VIN=6V
VIN=12V
VIN=17V
Figure 4-2. TPS563203EVM Efficiency
IOUT(A)
Efficiency
0.001 0.005 0.02 0.05 0.1 0.2 0.5 1 2 3
0
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
VIN=4.2V
VIN=6V
VIN=12V
VIN=17V
Figure 4-3. TPS563206EVM Efficiency
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4.4 Load Regulation
Figure 4-4 shows load regulation for the TPS563203EVM. Figure 4-5 shows load regulation for the
TPS563206EVM.
IOUT(A)
Load Regulation
0.001 0.005 0.02 0.05 0.1 0.2 0.5 1 2 3
-1%
-0.8%
-0.6%
-0.4%
-0.2%
0
0.2%
0.4%
0.6%
0.8%
1%
VIN=4.2V
VIN=6V
VIN=12V
VIN=17V
Figure 4-4. TPS563203EVM Load Regulation
IOUT(A)
Load Regulation
0.001 0.005 0.02 0.05 0.1 0.2 0.5 1 2 3
-1%
-0.8%
-0.6%
-0.4%
-0.2%
0
0.2%
0.4%
0.6%
0.8%
1%
VIN=4.2V
VIN=6V
VIN=12V
VIN=17V
Figure 4-5. TPS563206EVM Load Regulation
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4.5 Line Regulation
Figure 4-6shows line regulation for the TPS563203EVM. Figure 4-7 shows line regulation for the
TPS563206EVM.
VIN(V)
VOUT(V)
4 5 6 7 8 9 10 11 12 13 14 15 16 17
1
1.01
1.02
1.03
1.04
1.05
1.06
1.07
1.08
1.09
1.1
IOUT=0A
IOUT=3A
Figure 4-6. TPS563203EVM Line Regulation
VIN(V)
VOUT(V)
4 5 6 7 8 9 10 11 12 13 14 15 16 17
1
1.01
1.02
1.03
1.04
1.05
1.06
1.07
1.08
1.09
1.1
IOUT=0A
IOUT=3A
Figure 4-7. TPS563206EVM Line Regulation
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4.6 Load Transient Response
Figure 4-8 shows the response to load transient for the TPS563203EVM. Figure 4-9 shows the response to load
transient for the TPS563206EVM. The current steps slew rate is set as 2.5 A/μs.
200us/div
Iout=2A/div
Vout=50mV/div (AC coupled)
Figure 4-8. TPS563203EVM Load Transient Response, 10% to 90% (0.3 A to 2.7 A) Load Step
200us/div
Iout=2A/div
Vout=50mV/div (AC coupled)
Figure 4-9. TPS563206EVM Load Transient Response, 10% to 90% (0.3 A to 2.7 A) Load Step
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4.7 Start-Up
Figure 4-10shows the TPS563203EVM start-up waveform relative to VIN. The load is 3 A.
4ms/div
Vout=500mV/div
VEN=2V/div
VIN=5V/div
Figure 4-10. TPS563203EVM Start-Up Relative to VIN
Figure 4-11shows the TPS563206EVM start-up waveform relative to enable (EN). The load is 3 A.
4ms/div
Vout=500mV/div
VEN=2V/div
VIN=5V/div
Figure 4-11. TPS563206EVM Start-Up Relative to EN
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4.8 Shutdown
Figure 4-12 shows the TPS563203EVM shut-up waveform relative to VIN. The load is 3 A.
4ms/div
Vout=500mV/div
VEN=2V/div
VIN=5V/div
Figure 4-12. TPS563203EVM Shutdown Relative to VIN
Figure 4-12shows the TPS563206EVM shut-up waveform relative to enable (EN). The load is 3 A.
2ms/div
Vout=500mV/div
VEN=2V/div
VIN=5V/div
Figure 4-13. TPS563206EVM Shutdown Relative to EN
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