Texas Instruments LM5122EVM-2PH User manual

LM5122EVM-2PH Evaluation Module

User's Guide

Literature Number: SNVU205

APRIL 2013

Contents

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

2 Features and Electrical Performance ..................................................................................... 4

3 Test Points ......................................................................................................................... 4

3.1 Test Points ............................................................................................................... 4

4 Test Equipment ................................................................................................................... 5

4.1 Power Supply ............................................................................................................ 5

4.2 Electronic Load .......................................................................................................... 5

4.3 Meters ..................................................................................................................... 5

4.4 Oscilloscope .............................................................................................................. 5

5 Test Setup and Procedure .................................................................................................... 5

5.1 Precaution & Wire Gauge .............................................................................................. 5

5.2 Test Setup ................................................................................................................ 6

5.3 Quick Test Procedure ................................................................................................... 6

6 Performance Curves ............................................................................................................ 6

6.1 Efficiency ................................................................................................................. 6

6.2 Load Transient ........................................................................................................... 7

6.3 Interleaving ............................................................................................................... 7

6.4 Light Load Operations .................................................................................................. 8

6.5 Startup .................................................................................................................... 9

6.6 Loop Response .......................................................................................................... 9

7 Schematic ......................................................................................................................... 10

8 Layout .............................................................................................................................. 12

9 Bill of Materials ................................................................................................................. 15

2Table of Contents SNVU205–APRIL 2013

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List of Figures

1 Connection Diagram........................................................................................................ 5

2 Efficiency..................................................................................................................... 6

3 Load Transient .............................................................................................................. 7

4 Interleaving................................................................................................................... 7

5 Pulse Skip.................................................................................................................... 8

6 Skip Cycle.................................................................................................................... 8

7 Forced PWM................................................................................................................. 8

8 Startup........................................................................................................................ 9

9 Loop Response.............................................................................................................. 9

10 Schematic (Power Block)................................................................................................. 10

11 Schematic (Control Block)................................................................................................ 11

12 Top Silk (Top View) ....................................................................................................... 12

13 Bottom Silk (X-Ray View) ................................................................................................ 12

14 Top Copper (Top View)................................................................................................... 13

15 Mid1 Copper (X-Ray View)............................................................................................... 13

16 Mid2 Copper (X-Ray View)............................................................................................... 14

17 Bottom Copper (X-Ray View)............................................................................................ 14

List of Tables

1 Electrical Performance Specifications.................................................................................... 4

2 Pin Descriptions............................................................................................................. 4

3 Bill of Materials............................................................................................................. 15

SNVU205–APRIL 2013 List of Figures

User's Guide

SNVU205–APRIL 2013

LM5122EVM-2PH Evaluation Module

1 Introduction

The LM5122EVM-2PH evaluation module (EVM) provides the design engineer with a fully functional dual

phase synchronous boost converter to evaluate the Texas Instruments LM5122 synchronous boost

controller device. The EVM provides 28 V output at up to 7 A current from a 9 V to 20 V input. The EVM is

designed to start up from a single power supply without any additional bias voltage.

2 Features and Electrical Performance

• 9 V to 20 V input voltage range

• 28 V target output voltage

• Up to 7 A output current

• 250 kHz typical switching frequency

• Dual phase interleaved operation

Table 1. Electrical Performance Specifications

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Input Characteristics

Input Voltage 9 12 20 V

Input Current VSUPPLY = 12 V, ILOAD = 7A 17 A

Output Characteristics

Output Voltage ILOAD = 7A 27.02 28 28.98 V

Output Current 7 A

System Characteristics

Switching Frequency 250 kHz

Full Load Efficiency VSUPPLY = 12 V 96%

VSUPPLY = 20 V 98%

3 Test Points

3.1 Test Points

Table 2. Pin Descriptions

PIN NAME DESCRIPTIONS

TP7, TP8 Power Ground

TP5, TP9, TP10 Analog Ground

TP6 UVLO

J1#1 External Synchronization Pulse Positive Input

J1#2 External Synchronization Pulse Negative Input

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Oscilloscope

ACOM

Ampere Meter

Power Supply

Electronic Load

+- V

Voltage Meter

COM

-s +s

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Test Equipment

4 Test Equipment

4.1 Power Supply

Power Supply should be capable of 20 V / 25 A, current monitoring and remote sensing.

4.2 Electronic Load

Electronic load should be capable of 32 V / 7 A. Use Constant Current (CC) mode.

4.3 Meters

One current meter is required to measure input current accurately. Maximum current rating of the meter

should be carefully considered. Input current can be as high as 25 A at full load current and minimum

input voltage. Output voltage is monitored by a voltage meter which should be capable of monitoring up to

32 V.

4.4 Oscilloscope

Oscilloscope and 10x probe with at least 20 MHz bandwidth are required.

5 Test Setup and Procedure

Figure 1. Connection Diagram

5.1 Precaution & Wire Gauge

Prolonged operation with low input voltage at full power will cause heating of the MOSFETs. A fan with a

minimum of 200LFM should be always provided.

Wire gauge for the input power supply should be 6-8 AWG minimum and no longer than 1 foot each for

VIN and GND. Wire gauge for the output electronic load should be 12 AWG minimum and no longer than

1 foot each for VOUT and GND.

SNVU205–APRIL 2013 LM5122EVM-2PH Evaluation Module

100

0 2 4 6 8

EFFICIENCY [%]

LOAD CURRENT [A]

C001

FSW = 250 kHz

VOUT = 28V

VSUPPPLY = 20V

VSUPPLY = 9V

VSUPPLY = 12V

Performance Curves

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5.2 Test Setup

5.2.1 Power Supply

Connect the power supply’s positive terminal (+) to ‘A’ terminal of ampere meter and negative terminal (-)

to TP4 GND. Connect the power supply’s positive remote sense terminal to TP2 VIN and negative remote

sense terminal to TP4 GND.

5.2.2 Meter

Connect ‘COM’ terminal of ampere meter to TP2 VIN. Double check ‘A’ terminal is connected to the power

supply’s positive terminal.

Voltage meter is used to measure output voltage. Connect positive terminal (V) of the voltage meter to

TP1 VOUT and negative terminal (COM) of the voltage meter to TP3 GND.

5.2.3 Load

Connect electronic load’s positive terminal (+) to TP1 VOUT and negative terminal (-) to TP3 GND.

5.3 Quick Test Procedure

5.3.1 Startup

• Set load current to 0 A and turn the load on

• Set power supply current limit to 25 A

• Turn on the power supply and increase voltage slowly up to 20 V

• Increase load current slowly up to 7 A

5.3.2 Shutdown

• Turn off the load

• Decrease the input voltage down to 0 V

• Turn on the load and discharge output capacitor

6 Performance Curves

The following curves are presented for reference, the actual field data may differ from these curves. Actual

performance data can be affected by measurement techniques, equipment setting and environmental

variables.

6.1 Efficiency

Figure 2. Efficiency

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Performance Curves

6.2 Load Transient

VSUPPLY = 12 V, 3.5 A to 7 A and 7 A to 3.5 A load transient

C1: VOUT

Figure 3. Load Transient

6.3 Interleaving

VSUPPLY = 12 V

C1: SW1, C2: SW2

Figure 4. Interleaving

SNVU205–APRIL 2013 LM5122EVM-2PH Evaluation Module

Performance Curves

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6.4 Light Load Operations

Forced PWM (FPWM) and Skip Cycle mode can be configured by controlling MODE pin voltage.

VSUPPLY = 12 V, ILOAD =0A

C1:SW1

Figure 5. Pulse Skip

C1: SW1

Figure 6. Skip Cycle

C1: SW1

Figure 7. Forced PWM

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-180

-135

-90

-45

135

180

-40

-30

-20

-10

100 1000 10000 100000

GAIN [dB]

FREQUENCY [Hz]

C002

PHASE

GAIN

VSUPPLY = 12V

LOAD

= 7.0A

PHASE [°]

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Performance Curves

6.5 Startup

VSUPPLY = 12 V, ILOAD =0A

C1: VOUT, C2: SS, C4: VSUPPLY

Figure 8. Startup

6.6 Loop Response

Figure 9. Loop Response

SNVU205–APRIL 2013 LM5122EVM-2PH Evaluation Module

Schematic

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7 Schematic

Figure 10. Schematic (Power Block)

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Table of contents

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