Texas Instruments TPS65265 Manuale utente

User’s Guide

TPS65265 Buck Converter Evaluation Module User's

Guide

ABSTRACT

This document presents the information required to operate the TPS65265 PMIC as well as the support

documentation including schematic, printed-circuit board (PCB) layout, hardware setup, and bill of materials.

Table of Contents

1 Background.............................................................................................................................................................................2

2 Schematic................................................................................................................................................................................3

3 Board Layout...........................................................................................................................................................................4

4 Bench Test Setup Conditions................................................................................................................................................ 7

4.1 Header Description and Jumper Placement...................................................................................................................... 7

5 Power-Up Procedure.............................................................................................................................................................. 9

6 Bill of Materials..................................................................................................................................................................... 10

7 Revision History................................................................................................................................................................... 10

Trademarks

All trademarks are the property of their respective owners.

www.ti.com Table of Contents

SLVUAK9A – DECEMBER 2015 – REVISED MAY 2021

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TPS65265 Buck Converter Evaluation Module User's Guide 1

1 Background

The TPS65265 PMIC is a triple 5-A/3-A/2-A output current, synchronous step-down (buck) converter with

an operational range of 4.5 to 17 V. The feedback voltage reference for each buck is 0.6 V. Each buck is

independent with dedicated enable and loop compensation. The TPS65265 supports PSM mode and FCC

mode.

As there are many possible options to set the converters, Table 1-1 presents the performance specification

summary for the EVM.

Table 1-1. Summary of Performance

Test Conditions Performance

VIN = 4.5 to 17 V

spa

fsw = 610 kHz

spa

(25°C ambient)

Buck1, 1.2 V, up to 5 A

spa

Buck2, 1.5 V, up to 3 A

spa

Buck3, 1.8 V, up to 2 A

The evaluation module is designed to provide access to the features of the TPS65265. Some modifications

can be made to this module to test performance at different input and output voltages, current and switching

frequency. Please contact the TI Field Applications Group for advice on these matters.

Background www.ti.com

2TPS65265 Buck Converter Evaluation Module User's Guide SLVUAK9A – DECEMBER 2015 – REVISED MAY 2021

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2 Schematic

Figure 2-1 illustrates the TPS65265EVM-705 EVM schematic.

0.047uF

C15

0.01uF

C26

22uF

C17

GND

DNI

TP8

0.047uF

C22

R11

22uF

C23

GND

R12

DNI

TP11

GND

22uF

GND

0.047uF

GND

TP9

TP10

GND

TP6

TP7

GND

TP1

TP3

EN1

GND

TP2

TP4

VIN

10.0k

VOUT1 1.2V 5A

VOUT2 1.5V 3A

VOUT3 1.8V 2A

VIN 12V

VFB1

22uF

C18

GND

VFB2

VFB3

22uF

C24

GND

VFB3

GND

0.01uF

C27

GND

GND EN2

GND

GND EN3

GND

10.0k

R16

20.0k

R17

EN1

EN2

EN3

GND

VIN

GND

15.0k

R10

DNI

R13

R22

V7V

1uF

C16

22uF

1uF

C10

1uF

C11

82.5k

R15

PGOOD

82pF

C13

22pF

C12

22pF

C21

GND

22pF

C29

DNI

TP5

10.0k

GND

VFB1

22pF

C19

GND

22pF

C25

GND

4.7uH

22uF

DNI

GND GND

DNI

22uF

GND GND

MODE

GND

V7V

DNI

C32

DNI

C34

DNI

C33

MODE

PG_DLY

7,8 1,2,3

5,6, DNI

DNI

C30

DNI

C31

GND

PGOOD

VOUT1

VOUT2

VOUT1

VOUT2

SYNC

DNI

GND

DNI

TP12

DNI

TP14

VOUT4 1.8V 2AVo

GND

PGOOD

GND

2.2uH

V7V

PGOOD

EN1

EN2

EN3

FB2 6

COMP2 7

MODE

BST2 9

PGND2 10

LX2 11

PVIN2

PVIN3

LX3 14

PGND3 15

BST3 16

SQE_DLY

COMP3 18

FB3 19

ROSC

AGND 21

FB1 22

COMP1 23

PG_DLY

BST1 25

PGND1 26

PGND1 27

LX1 28

LX1 29

PVIN1

PSM

PAD

TPS65265RHBR

10.0k

R27

DNI

TP15

DNI

TP16

TP13

22uF

100k

R21

100k

R18

100k

R19

100k

R20

10.0k

2700pF

C14

2700pF

C20

2700pF

C28

6.8k

R14

6.8k

33k

R23

33k

R24

33k

R25

33k

R26

Figure 2-1. TPS65265EVM-705 Schematic

www.ti.com Schematic

SLVUAK9A – DECEMBER 2015 – REVISED MAY 2021

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TPS65265 Buck Converter Evaluation Module User's Guide 3

3 Board Layout

Figure 3-1 through Figure 3-5 illustrate the TPS65265EVM-705 PCB layout.

Figure 3-1. Component Placement (Top Layer)

Figure 3-2. Board Layout (Top Layer)

Board Layout www.ti.com

4TPS65265 Buck Converter Evaluation Module User's Guide SLVUAK9A – DECEMBER 2015 – REVISED MAY 2021

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Figure 3-3. Board Layout (Second Layer)

Figure 3-4. Board Layout (Third Layer)

www.ti.com Board Layout

SLVUAK9A – DECEMBER 2015 – REVISED MAY 2021

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TPS65265 Buck Converter Evaluation Module User's Guide 5

Figure 3-5. Board Layout (Bottom Layer)

Board Layout www.ti.com

6TPS65265 Buck Converter Evaluation Module User's Guide SLVUAK9A – DECEMBER 2015 – REVISED MAY 2021

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4 Bench Test Setup Conditions

4.1 Header Description and Jumper Placement

Figure 4-1 shows the jumper and pin placement on the TPS65265EVM-705 board.

Figure 4-1. TPS65265EVM-705 Header Description and Jumper Placement

Test points:

1. LX of VOUT1

2. LX of VOUT2

3. LX of VOUT3

VOUT1, VOUT2, VOUT3, VIN, PGOOD, PG_DLY, SYNC

Table 4-1. Input/Output Connection

# Function Description

J1 Buck1 Connector Output of Buck1

J2 Buck2 Connector Output of Buck2

J3 Buck3 Connector Output of Buck3

J5 VIN Connector Apply power supply to this connector

Table 4-2. Jumpers

# Function Placement Comment

J6 Buck1 enable (EN1) Connect EN1 to GND to disable VOUT1

spa

Connect EN1 to HIGH or leave open to enable VOUT1

J7 Buck2 enable (EN2) Connect EN2 to GND to disable VOUT2

spa

Connect EN2 to HIGH or leave open to enable VOUT2

www.ti.com Bench Test Setup Conditions

SLVUAK9A – DECEMBER 2015 – REVISED MAY 2021

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TPS65265 Buck Converter Evaluation Module User's Guide 7

Table 4-2. Jumpers (continued)

# Function Placement Comment

J8 Buck3 enable (EN3) Connect EN3 to GND to disable VOUT3

spa

Connect EN3 to HIGH or leave open to enable VOUT3

J9 MODE Power sequencing mode control pin.

spa

Connect MODE pin to GND or HIGH, set the power sequence with

pre-defined power up and power down sequence.

spa

Leave open to set power up and down with dedicated enable pin.

Bench Test Setup Conditions www.ti.com

8TPS65265 Buck Converter Evaluation Module User's Guide SLVUAK9A – DECEMBER 2015 – REVISED MAY 2021

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5 Power-Up Procedure

Power-up with dedicated enable pin:

1. Apply 4.5 V–17 V to J5

2. Toggle J6 , J7, or J8 to enable VOUT1, VOUT2, and VOUT3, respectively

3. Apply loads to the output connectors

Six bucks power sequence schemes with the pre-defined power up and power down sequence, shown in Table

5-1.

1. Connect J9 to GND or high

2. Connect J6 to High(or Low), J7 to High(or Low)

3. Apply 4.5 V–18 V to J5

4. Toggle J8 to enable VOUT1, VOUT2, and VOUT3 (power up sequence shown in Table 5-1)

5. Apply loads to the output connectors

Table 5-1. Power Sequencing

Mode EN1 EN2 EN3 Start Sequencing Shutdown Sequencing

Low High High Used to start/stop bucks in

sequence

buck1→buck2→buck3 Buck3→buck2→buck1

Low Low High Buck2→buck1→buck3 Buck3→buck1→buck2

Low High Low Buck2→buck3→buck1 Buck1→buck3→buck2

High High High Buck1→buck3→buck2 Buck2→buck3→buck1

High Low High Buck3→buck1→buck2 Buck2→buck1→buck3

High High Low Buck3→buck2→buck1 Buck1→buck2→buck3

High/Low Low Low Reserved Reserved Reserved

www.ti.com Power-Up Procedure

SLVUAK9A – DECEMBER 2015 – REVISED MAY 2021

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TPS65265 Buck Converter Evaluation Module User's Guide 9

6 Bill of Materials

Table 6-1 lists the TPS65265EVM-705 BOM.

Table 6-1. TPS65265EVM-705 Bill of Materials

# Value Qty Designator Footprint Manufacturer Manufacturer Part Number Description

1 47nF 3 C8, C9, C17 0603 Generic CAP 47nF 50V CERAMIC X7R 0603

2 10nF 1 C7 0603 Generic CAP 10nF 50V CERAMIC X7R 0603

3 3.3nF 1 C4 0603 Generic CAP 3.3nF 50V CERAMIC X7R 0603

4 22uF 4 C10, C11, C12, C18 1206 Generic CAP 22uF 16V CERAMIC X5R 1206

5 22pF 3 C2, C3, C5 0603 Generic CAP 22pF 16V CERAMIC X7R 0603

6 82pF 1 C1 0603 Generic CAP 82pF 50V CERAMIC X7R 0603

7 4.7uF 2 C19, C20 0603 Generic CAP 4.7uF 50V CERAMIC X7R 0603

8 10uF 3 C13, C14, C15 1206 Generic CAP 10uF 16V CERAMIC X5R 1206

9 1uF 3 C6, C16, C21 0603 Generic CAP 1uF 50V CERAMIC X7R 0603

10 4.99K 1 R52 0603 Generic RES 4.99k OHM 1/10W 1% 0603 SMD

11 36.5K 1 R51 0603 Generic RES 36.5k OHM 1/10W 1% 0603 SMD

12 10K 1 R42 0603 Generic RES 10k OHM 1/10W 1% 0603 SMD

13 31.6K 1 R41 0603 Generic RES 31.6k OHM 1/10W 1% 0603 SMD

14 8.67K 1 R32 0603 Generic RES 8.67 OHM 1/10W 1% 0603 SMD

15 19.6K 1 R22 0603 Generic RES 19.6k OHM 1/10W 1% 0603 SMD

16 39K 2 R21, R31 0603 Generic RES 39k OHM 1/10W 1% 0603 SMD

17 51K 1 R10 0603 Generic RES 51k OHM 1/10W 1% 0603 SMD

18 100K 2 R8, R9 0603 Generic RES 100k OHM 1/10W 1% 0603 SMD

19 0 6 R2, R3, R4, R5, R6,

0603 Generic RES 0k OHM 1/10W 1% 0603 SMD

20 20K 3 R1, R11, R12 0603 Generic RES 20k OHM 1/10W 1% 0603 SMD

21 4.7uH 3 L1, L2, L3 IND_744311470 Wurth Electronics

Inc

744311470 SMT power inductor

22(1) HEADER

3 PIN

6 JP1, JP2, JP3, JP4,

JP5, JP6

JMP0.3 Mil-Max 800-10-064-10-001000 Three Pin Header, Break SIPs into groups of 3

23 ED500/2

8 J1, J2, J3, J4, J5, J6,

J7, J8

TB_2X5.0MM OnShore

Technology Inc

ED500/2DS Terminal Block, 2-pin, 15-A, 5.0mm

24 Test

Point

White

9 TP1, TP2, TP3, TP4,

TP5, TP6, TP8, TP9

TP Keystone 5002 TEST POINT PC MINI .040"D WHITE

25 Test

Point

Black

6 TP10, TP11, TP12,

TP13, TP14, TP15

TP Keystone 5001 TEST POINT PC MINI .040"D BLACK

26 6 Jumper, 2.54mm, open top, Applied on item 22

27(2) 4 3M SJ-5303 (CLEAR) BUMPON HEMISPHERE .44X.20 CLEAR

28 1 U1 RHB Texas

Instruments

TPS65262RHBR

(1) Item 22: split into 3 pins

(2) Install item 27 on bottom at corners

7 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision * (December 2015) to Revision A (May 2021) Page

• Updated user's guide title................................................................................................................................... 2

• Updated the numbering format for tables, figures, and cross-references throughout the document. ................2

Bill of Materials www.ti.com

10 TPS65265 Buck Converter Evaluation Module User's Guide SLVUAK9A – DECEMBER 2015 – REVISED MAY 2021

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