Texas Instruments TPS563203 Manuale utente

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.

www.ti.com Table of Contents

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TPS563203 and TPS563206 Step-Down Converter Evaluation Module User's

Guide

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

Introduction www.ti.com

2TPS563203 and TPS563206 Step-Down Converter Evaluation Module User's

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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 +

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

www.ti.com Output Voltage Setpoint

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TPS563203 and TPS563206 Step-Down Converter Evaluation Module User's

Guide

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

Test Setup and Results www.ti.com

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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

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

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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TPS563203 and TPS563206 Step-Down Converter Evaluation Module User's

Guide

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%

0.2%

0.4%

0.6%

0.8%

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%

0.2%

0.4%

0.6%

0.8%

VIN=4.2V

VIN=6V

VIN=12V

VIN=17V

Figure 4-5. TPS563206EVM Load Regulation

Test Setup and Results www.ti.com

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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

1.01

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

1.01

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

www.ti.com Test Setup and Results

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TPS563203 and TPS563206 Step-Down Converter Evaluation Module User's

Guide

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

Test Setup and Results www.ti.com

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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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TPS563203 and TPS563206 Step-Down Converter Evaluation Module User's

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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

Test Setup and Results www.ti.com

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