Texas Instruments LM5122EVM-2PH User Manual

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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

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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 Figures

List of Tables

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

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

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

SNVU205–APRIL 2013 List of Figures

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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 V

Output Characteristics

Output Voltage I Output Current 7 A

System Characteristics

Switching Frequency 250 kHz Full Load Efficiency V

= 12 V, I

SUPPLY

= 7A 27.02 28 28.98 V

LOAD

= 12 V 96%

SUPPLY

= 20 V 98%

SUPPLY

= 7A 17 A

LOAD

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3 Test Points

3.1 Test Points

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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Table 2. Pin Descriptions

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Oscilloscope

COM

Ampere Meter

Power Supply

Electronic Load

Voltage Meter

COM

-s +s

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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

Test Equipment

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.

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Figure 1. Connection Diagram

100

0 2 4 6 8

EFFICIENCY [%]

LOAD CURRENT [A]

C001

FSW = 250 kHz

OUT

= 28V

SUPPPLY

= 20V

SUPPLY

= 9V

SUPPLY

= 12V

Performance Curves

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

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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

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Figure 2. Efficiency

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6.2 Load Transient

Performance Curves

V C1: V

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

SUPPLY

OUT

6.3 Interleaving

V C1: SW1, C2: SW2

SUPPLY

= 12 V

Figure 3. Load Transient

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Figure 4. Interleaving

Performance Curves

6.4 Light Load Operations

Forced PWM (FPWM) and Skip Cycle mode can be configured by controlling MODE pin voltage. V C1:SW1

C1: SW1

SUPPLY

= 12 V, I

LOAD

= 0 A

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Figure 5. Pulse Skip

C1: SW1

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Figure 6. Skip Cycle

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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6.5 Startup

Performance Curves

V C1: V

SUPPLY

= 12 V, I

, C2: SS, C4: V

OUT

LOAD

6.6 Loop Response

= 0 A

SUPPLY

Figure 8. Startup

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Figure 9. Loop Response

Schematic

7 Schematic

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LM5122EVM-2PH Evaluation Module SNVU205–APRIL 2013

Figure 10. Schematic (Power Block)

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Schematic

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Figure 11. Schematic (Control Block)

Layout

8 Layout

The LM5122 2-phase EVM has been designed using a 4-layer board. Most of components are on the top to allow the user to easily view, probe, and evaluate the LM5122 device.

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Figure 12. Top Silk (Top View)

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Figure 13. Bottom Silk (X-Ray View)

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Layout

Figure 14. Top Copper (Top View)

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Figure 15. Mid1 Copper (X-Ray View)

Layout

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Figure 16. Mid2 Copper (X-Ray View)

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Figure 17. Bottom Copper (X-Ray View)

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9 Bill of Materials

The EVM components are list according to the schematic shown in Figure 10 and Figure 11 .

REFERENCE

DESIGNATOR

C1, C13 MURATA GRM2165C2A471JA01D 2 C2, C3, C12, C14,

C15 C4, C5, C6, C16,

C17, C18 C7 MURATA GRM21BR71H105KA12L 1 C8, C9, C10, C11 CAP ALUM 330 uF 35 V 20% SMD Panasonic EEE-FP1V331AP 4 C19, C20, C29 MURATA GRM188R71E104KA01D 3

C21, C22, C25, C26 MURATA GRM1885C1H101JA01D 4

C23, C24 MURATA GRM21BR71C475KA73L 2

C27, C28, C30 MURATA GRM188R71E474KA12D 3

C31 KEMET C0603C331K5RACTU 1

C32 KEMET C0603C223K5RACTU 1 R1, R7 RES 8.2 Ω 3/4W 5% 2010 SMD Vishay CRCW20108R20JNEF 2

R2, R8 RES, 0.004 Ω, 3 W, 1%, 3015, WIDE Susumu KRL7638-C-R004-F-T1 2 R3, R4, R9, R10 RES, 100 Ω, 1%, 0.1 W, 0603 Vishay CRCW0603100RFKEA 4 R5, R6, R11, R12,

R15, R16, R26, R28, RES, 0 Ω, 5%, 0.1 W, 0603 Panasonic ERJ-3GEY0R00V 10 R35, R36

R19, R33 RES, 49.9k Ω, 1%, 0.1 W, 0603 Vishay CRCW060349K9FKEA 2 R20, R21 RES, 3.3 Ω, 5%, 0.1 W, 0603 Vishay CRCW06033R30JNEA 2 R24 RES, 8.06k Ω, 1%, 0.1 W, 0603 Vishay CRCW06038K06FKEA 1 R25, R27 RES, 78.7k Ω, 1%, 0.1 W, 0603 Vishay CRCW060378K7FKEA 2 R29 RES, 36.5k Ω, 1%, 0.1 W, 0603 Vishay CRCW060336K5FKEA 1 R31 RES, 59.0k Ω, 1%, 0.1 W, 0603 Vishay CRCW060359K0FKEA 1 R32 RES, 2.26k Ω, 1%, 0.1 W, 0603 Vishay CRCW06032K26FKEA 1 R34 RES, 576 Ω, 1%, 0.125 W, 0805 Vishay CRCW0805576RFKEA 1 D1, D2 Diode, Schottky, 60 V, 1 A, SOD-123F NXP PMEG6010CEH 2 Q1, Q2, Q3, Q4 MOSFET N-CH 40 V 100 A LFPAK NXP PSMN4R0-40YS 4

L1, L2 SMD Flat Wire WE-HCI, L Ω = 10.0 µH WURTH 74435561100 2 TP1, TP2, TP3, TP4 Terminal screw, vertical, snap-in Keystone 7693 4 TP5, TP7, TP8 Test Point, TH, Multipurpose, Black Keystone 5011 3 TP6 Test Point, TH, Miniature, White Keystone 5002 1 TP9, TP10 Test Point, TH, Miniature, Black Keystone 5001 2 H1, H2, H5, H6 Standoff, Hex, 0.5"L #4-40 Nylon Keystone 1902C 4

H3, H4, H7, H8 B&F NY PMS 440 0025 PH 4 J1 Header, TH, 100mil, 2x1, Gold plated SAMTEC TSW-102-07-G-S 1

U1, U2 Synchronous Boost Controller Texas Instruments LM5122MH 2

Bill of Materials

Table 3. Bill of Materials

DESCRIPTION MANUFACTURER PART NUMBER QTY

CAP, CER, 470 pF, 100 V, +/-5%, C0G, 0805

CAP CER 3.3 uF 50 V 10% X7R 1206 TDK C3216X7R1H335K160AC 5

CAP CER 10 uF 35 V 10% X7R 1206 Taiyo Yuden GMK316AB7106KL 6 CAP, CER, 1 uF, 50 V, +/-10%, X7R,

0805

CAP, CER, 0.1 uF, 25 V, +/-10%, X7R, 0603

CAP, CER, 100 pF, 50 V, +/-5%, C0G/NP0, 0603

CAP, CER, 4.7 uF, 16 V, +/-10%, X7R, 0805

CAP, CER, 0.47 uF, 25 V, +/-10%, X7R, 0603

CAP, CER, 330 pF, 50 V, +/-10%, X7R, 0603

CAP, CER, 0.022 uF, 50 V, +/-10%, X7R, 0603

MOSFET N-CH 40 V 100 A SON 5x6 Texas Instruments CSD18501Q5A ALT

Machine Screw, Round, #4-40 x 1/4, Nylon

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Bill of Materials

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Texas Instruments LM5122EVM-2PH User Manual

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