Texas Instruments LM5175EVM-HP Manual de usuario

LM5175 Wide VIN 4-Switch Buck-Boost

Converter High Power Evaluation Module

User's Guide

Literature Number: SNVU465

February 2015

Contents

1 Introduction......................................................................................................................... 4

1.1 Features................................................................................................................... 4

1.2 Applications ............................................................................................................... 4

2 Connector, Test Point and Selection Switch Descriptions......................................................... 5

2.1 Connector and Test Point Descriptions ............................................................................... 5

2.2 Selection Switch Descriptions.......................................................................................... 6

2.2.1 S1 Mode ....................................................................................................... 6

2.2.2 S2 ENABLE ................................................................................................... 6

2.2.3 S3 DITHER.................................................................................................... 6

3 Test Setup and Procedure..................................................................................................... 6

3.1 Test Setup................................................................................................................. 6

3.2 Test Procedure ........................................................................................................... 7

4 Test Data and Performance Curve.......................................................................................... 7

4.1 Efficiency .................................................................................................................. 7

4.2 Typical Operation Waveforms.......................................................................................... 8

4.3 Soft Start .................................................................................................................. 9

5 LM5175EVM-HP Schematic.................................................................................................. 10

6 Assembly Drawings and Layout........................................................................................... 11

7 LM5175EVM-HP Bill of Materials........................................................................................... 15

2Table of Contents SNVU465–February 2015

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List of Figures

1 Typical EVM Connection Diagram......................................................................................... 6

2 Efficiency vs. Output Current............................................................................................... 7

3 Efficiency and Power Loss vs. Input Voltage ............................................................................ 7

4 Typical Operation Waveforms (VIN=9 V, IOUT=2 A) ................................................................... 8

5 Typical Operation Waveforms (VIN=12 V, IOUT=2 A).................................................................. 8

6 Typical Operation Waveforms (VIN=15 V, IOUT=2 A).................................................................. 8

7 Turn-on Waveforms (VIN=24 V, IOUT=0 A) ............................................................................. 9

8 Turn-on Waveforms (VIN=24 V, IOUT=10 A)............................................................................ 9

9 4-Switch Buck-Boost Converter Schematic............................................................................. 10

10 Top Assembly............................................................................................................... 11

11 Assembly Bottom .......................................................................................................... 11

12 Top Layer.................................................................................................................... 12

13 Mid-Layer 1 ................................................................................................................. 12

14 Mid-Layer 2 ................................................................................................................. 13

15 Mid-Layer 3 ................................................................................................................. 13

16 Mid-Layer 4 ................................................................................................................. 14

17 Bottom Layer................................................................................................................ 14

List of Tables

1 Connectors and Test Points................................................................................................ 5

2 LM5175EVM-HP Bill of Materials ........................................................................................ 15

SNVU465–February 2015 List of Figures

User's Guide

SNVU465–February 2015

This user’s guide describes the characteristics, operation, and use of the LM5175 high power evaluation

module (EVM). The LM5175EVM-HP is a fully assembled and tested circuit for evaluating the

performance of the LM5175 42 V wide VIN Synchronous 4-Switch Buck-Boost Controller. This user's

guide contains the electrical specification, quick setup procedure, performance curves, application

schematic, and bill of materials (BOM).

1 Introduction

The LM5175 is a synchronous 4-switch buck-boost controller capable of regulating the output voltage at,

below, or above the input voltage. The wide input voltage of 3.5 V to 42 V supports a variety of

applications. The output voltage is adjustable from 0.8 V to 55 V.

The LM5175EVM-HP high power EVM is fully assembled and tested platform for evaluating the operation

and performance of the LM5175 buck-boost controller. The LM5175EVM-HP has an input voltage range

from 6 V to 36 V, the output voltage is set as 12 V using an external feedback resistor divider.

1.1 Features

• Wide input voltage range from 6 V to 36 V

• 12 V nominal output voltage

• Up to 10 A output current capability (120W output power)

• 260kHz switching frequency

• Constant Output Voltage and Constant Output Current Options

• Optional frequency dithering

• Optional parallel FET sites provide flexibility to further extend output power capability

1.2 Applications

• Industrial PCs

• Point of Sale Terminals

• Automotive Start-Stop Systems

• Battery Backup Systems

4SNVU465–February 2015

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Connector, Test Point and Selection Switch Descriptions

2 Connector, Test Point and Selection Switch Descriptions

2.1 Connector and Test Point Descriptions

This EVM includes I/O connectors and test points as shown in Table 1. The power supply must be

connected to input connectors, J1 and J2. The load must be connected to output connectors, J3 and J4.

Table 1. Connectors and Test Points

Reference Designator Description

J1 Input voltage positive connection

J2 Input voltage return connection

J3 Output voltage connection

J4 Output voltage return connection

TP1 (VIN) Input voltage positive test point

TP2 (GND) Input voltage return test point

TP3 (VOUT) Output voltage positive test point

TP4 (GND) Output voltage return test point

TP5 (PGOOD) Power Good output

TP6 (BIAS) BIAS voltage test point

TP7(SYNC) SYNC input

SNVU465–February 2015

Connector, Test Point and Selection Switch Descriptions

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2.2 Selection Switch Descriptions

2.2.1 S1 Mode

This switch provides selection of different operation modes detailed as following:

• Switch in position 1 (Mode pin tied to GND), Hiccup mode disabled and DCM.

• Switch in position 2 (Mode pin tied to 93.1kΩresistor), Hiccup mode enabled and CCM.

• Switch in position 3 (Mode pin tied to VCC), Hiccup disabled and CCM.

Note 1: If Hiccup enabled and DCM combination is desired, change R19 to 49.9 kΩand put switch in

position 2.

2.2.2 S2 ENABLE

This switch enables/disables LM5175 on the EVM, or it can be used to set adjustable VIN UVLO.

• Switch in position 1 (EN pin tied GND), LM5175 disabled.

• Switch in position 2 (EN pin tied to resistor divider network consist of R13 and R18), EN pin along the

resistor divider network to set LM5175 UVLO threshold.

• Switch in position 3 (EN pin tied VCC), LM5175 enabled.

2.2.3 S3 DITHER

This switch enables/disables frequency dithering feature on the EVM.

• Switch in position 1 (EN pin tied GND), frequency dithering feature disabled.

• Switch in position 2 (EN pin tied to C27), frequency dithering feature enabled.

• No connection in position 3, do not apply switch to this position.

3 Test Setup and Procedure

3.1 Test Setup

Figure 1 shows a typical test setup to evaluate the LM5175EVM-HP

Figure 1. Typical EVM Connection Diagram

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Test Setup and Procedure

3.2 Test Procedure

Step 1: Set the power supply current limit to 1 A. Turn off the power supply. Connect the positive output of

the power supply to J1 and the negative output to J2.

Step 2: Connect the load to J3 for the positive connection and J4 for the negative connection.

Step 3: Set the power supply voltage to 9V and the load to 0.1 A. The electronic load voltage should be in

regulation with a nominal 12 V output.

Step 4: Slowly increase the load while monitoring the output voltage between TP3 and TP4. It should

remain in regulation with a nominal 12 V output as the load is increased up to 10 A.

Step 5: Slowly sweep the input voltage from 6 V to 36 V. The output voltage should remain in regulation

with a nominal 12 V output.

Step 6: Turn off the load, and decrease the input voltage down to 0 V to shut down the buck-boost

converter, and then turn on the load to discharge the output capacitors.

4 Test Data and Performance Curve

4.1 Efficiency

Figure 2. Efficiency vs. Output Current Figure 3. Efficiency and Power Loss vs. Input Voltage

SNVU465–February 2015

Test Data and Performance Curve

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4.2 Typical Operation Waveforms

Figure 5. Typical Operation Waveforms (VIN=12 V, IOUT=2

Figure 4. Typical Operation Waveforms (VIN=9 V, IOUT=2 A)

Figure 6. Typical Operation Waveforms (VIN=15 V, IOUT=2 A)

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Test Data and Performance Curve

4.3 Soft Start

Figure 7. Turn-on Waveforms (VIN=24 V, IOUT=0 A) Figure 8. Turn-on Waveforms (VIN=24 V, IOUT=10 A)

SNVU465–February 2015

LM5175EVM-HP Schematic

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5 LM5175EVM-HP Schematic

Figure 9. 4-Switch Buck-Boost Converter Schematic

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Tabla de contenidos

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