Texas Instruments TPS51125AEVM Manual de usuario

User’s Guide

TPS51125A Buck Controller Evaluation Module User's

Guide

Table of Contents

1 Introduction.............................................................................................................................................................................2

2 Performance Specification Summary................................................................................................................................... 2

3 Schematic................................................................................................................................................................................3

4 Test Setup and Results.......................................................................................................................................................... 4

5 Configuration.......................................................................................................................................................................... 5

6 Physical Layouts.................................................................................................................................................................... 6

7 List of Materials.......................................................................................................................................................................8

8 References.............................................................................................................................................................................. 9

9 Revision History......................................................................................................................................................................9

Trademarks

Out-of-Audio™ is a trademark of Texas Instruments.

D-CAP™ is a trademark of to.

is a trademark of TI.

All trademarks are the property of their respective owners.

www.ti.com Table of Contents

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TPS51125A Buck Controller Evaluation Module User's Guide 1

1 Introduction

The TPS51125A is a cost effective, dual-synchronous buck controller targeted for notebook system power

supply solutions. It provides 5-V and 3.3-V LDOs and requires few external components. The 270-kHz VCLK

output can be used to drive an external charge pump, generating gate drive voltage for the load switches without

reducing the efficiency of the main converter. The TPS51125A supports high-efficiency, fast transient response

and provides a combined power-good signal. Out-of-Audio™ mode light-load operation enables low acoustic

noise at much higher efficiency than conventional forced PWM operation. Adaptive on-time D-CAP™ control

provides convenient and efficient operation. The part operates with supply input voltages ranging from 5.5 V to

28 V and supports output voltages from 2 V to 5.5 V.

The TPS51125AEVM evaluation module is a high-efficiency, dual synchronous buck converter providing 5 V at

8 A and 3.3 V at 8 A from 8-V to 25-V input.

2 Performance Specification Summary

Table 2-1 gives the EVM performance specifications and qualifications.

Table 2-1. Performance Specification Summary

SPECIFICATION TEST CONDITIONS MIN TYP MAX UNITS

VIN Input voltage range Voltage applied to VBAT 8 25 V

CHANNEL1

VOUT Output voltage 5 V

fOperating frequency VTONSEL = VVREF, VVIN = 12 V, IOUT = 6 A 245 kHz

IOUT Output current 8 V ≤ VVIN ≤ 25 V 8 A

IOC Overcurrent limit VVIN = 12 V 10

CHANNEL2

VOUT Output voltage 3.3 V

fOperating frequency VTONSEL = VVREF, VVIN = 12 V, IOUT = 6 A 305 kHz

IOUT Output current 8 V ≤ VVIN ≤ 25 V 8 A

IOC Overcurrent limit VVIN = 12 V 10

Introduction www.ti.com

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3 Schematic

Figure 3-1. TPS51125A-EVM Schematic Diagram

www.ti.com Schematic

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TPS51125A Buck Controller Evaluation Module User's Guide 3

4 Test Setup and Results

4.1 Test Setup

Connect the test equipment and TPS51125AEVM board as shown in Figure 4-1.

Electronic

Load1

Electronic

Load2

DMM1

DMM2

12V/10A

Power Supply

DMM3

DMM4

Oscilloscope

CH1

CH2

Oscilloscope

VO2_GND

VO2

CN2

VO1

VO1_GND

VBAT_GND

VBAT

TP1

CN1

HPA557

TPS51125AEVM

1MW

Electronic

Load1

Electronic

Load2

DMM1

DMM2

12V/10A

Power Supply

DMM3

DMM4

Oscilloscope

CH1

CH2

Oscilloscope

VO2_GND

VO2

CN2

VO1

VO1_GND

VBAT_GND

VBAT

TP1

CN1

HPA557

TPS51125AEVM

VO2_GND

VO2

CN2

VO1

VO1_GND

VBAT_GND

VBAT

TP1

CN1

HPA557

TPS51125AEVM

1MW

Figure 4-1. Equipment Setup for TPS51125AEVM Board

4.2 Test Procedure

1. Ensure the switches SW1 (ENTRIP1), SW2 (ENTRIP2), and SW3 (EN0) are in the “OFF” position.

2. Ensure the shunt jumper for JP1 is set to 5-pin to 6-pin (Med1), and the shunt jumper for JP2 is set 3-pin to

4-pin (Auto-skip).

3. Apply appropriate VBAT voltage to VBAT and VBAT_GND terminals.

4. Turn on SW3 (EN0), and both VREG5 (5V-LDO) and VREG3 (3.3V-LDO) start up.

5. When SW3 stays on, VREF (2V-REF) is enabled.

6. When SW3 stays on and turn on SW1 (ENTRIP1), CH1-output starts up.

7. When SW3 stays on and turn on SW2 (ENTRIP2), CH2-output starts up.

4.3 Start-Up Performance

Figure 4-2. 5-V Start-Up Waveforms Figure 4-3. 3.3-V Start-Up Waveforms

Test Setup and Results www.ti.com

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Figure 4-4. 5-V Load Transient Response Figure 4-5. 3.3-V Load Transient Response

5 Configuration

This EVM can be set at a configuration of the user's choice. Please refer to the following specific configuration

setting sections.

5.1 Switching Frequency Selection

The switching frequency can be set by the TONSEL pin using JP1 on the EVM. The default setting is 245 kHz

for CH1 and 305 kHz for CH2.

Table 5-1. Switching Frequency Selection

TONSEL

CONNECTION

SWITCHING FREQUENCY (kHz)

CH1 CH2

GND (SLOW) 200 250

VREF (MED1) 245 305

VREG3 (MED2) 300 375

VREG5 (FAST) 365 460

5.2 Operation Mode Selection

Operation mode can be set by the SKIPSEL pin using JP2 on the EVM. The default setting on the EVM is

auto-skip mode.

Table 5-2. Operation Mode Selection

SKIPSEL CONNECTION OPERATION MODE

GND PWM only

VREF Auto skip

VREG5 Out-of-Audio™

5.3 VCLK ON/OFF Selection

The VCLK drive for the charge-pump can be disabled by pulling down EN0 with 620 kΩ of resistance using S1

on the EVM.

Table 5-3. VLCK Control

END CONNECTION VCLK

OPEN ENABLED

Pull down to GND with 620 kΩ DISABLED

www.ti.com Configuration

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TPS51125A Buck Controller Evaluation Module User's Guide 5

6 Physical Layouts

This section provides the board layout and assembly drawings for the EVM, that include the top layer (Figure

6-1), the bottom layer (Figure 6-2), and inner layer views (Figure 6-3 and Figure 6-4) of the EVM.

Figure 6-1. Top Layer Routing

Figure 6-2. Bottom Layer Routing

Physical Layouts www.ti.com

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Figure 6-3. Inner Layer 1

Figure 6-4. Inner Layer 2

www.ti.com Physical Layouts

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TPS51125A Buck Controller Evaluation Module User's Guide 7

7 List of Materials

List of materials for the TPS51125A-EVM.

Table 7-1. TPS51125A Bill of Materials

RERERENCE

DESIGNATOR QTY DESCRIPTION SIZE MFR PART NUMBER

C1, C2, C3, C4, C13,

C23 6 Capacitor, Ceramic, 0.1 µF, 50 V, X5R, 10% 0603 muRata GRM188B31H104K

C5 1 Capacitor, Ceramic, 1 μF, 25 V, X5R, 10% 0805 TDK C2012X7R1E105K

C6, C7, C24, C25 4 Capacitor, Ceramic, 10 μF, 25 V, BJ, M 1210 Taiyo Yuden TMK325BJ106MM

C8, C9, C14, C16,

C18, C26 0 Capacitor 0603 Any Any

C10, C21 0 Capacitor 7343 (D) Any Any

C11, C22 2 Capacitor, POS, 330 μF, 6.3 V, 25 mΩ, 20% 7343 (D) SANYO 6TPE330ML

C12, C20 0 Capacitor 0805 Any Any

C15, C17 2 Capacitor, Ceramic, 10 μF, 6.3 V, X5R, 10% 0805 TDK C2012X5R0J106K

C19 1 Capacitor, Ceramic, 0.22 µF, 16 V, B, 10% 0603 muRata GRM188B11C224K

CN1, CN2 2 Adaptor, 3.5-mm probe clip ( or 131-5031-00) 0.2 Tektronix 131-4244-00

D1 1 Diode, Schottky Barrier Array, 40 mA, 40 V SOT363 Diodes BAS40DW-04

D2, D5 0 Diode, Schottky, 0.5 A, 30 V SOD123 Any Any

D3, D4 2 Diode, Schottky, 3 A, 20 V SMA Rohm RSX501LA-20 or

RSX501L-20

JP1 1 Header, 2×4-pin, 100 mil spacing (36-pin strip) 0.20 × 0.40 in Sullins PTC36DAAN

JP2 1 Header, 2×3-pin, 100 mil spacing (36-pin strip) 0.20 × 0.30 in Sullins PTC36DAAN

L1, L2 2 Inductor, high-current, 5.9 mΩ, 14 A, SMT 0.425 × 0.45 in Toko FDA1055-3R3M

Q1, Q3 2 MOSFET, N-channel, 30 V, 13.6 A, 9.1 mΩ SO8 IR IRF7821

Q2, Q4 2 MOSFET, N-channel, 30 V, 10 A, 12 mΩ SO8 Fairchild FDS6690AS

R1, R3, R8, R11,

R13, R14 6 Resistor, Chip, 0 Ω, 1/16 W, 1% 0603 Std Std

R2, R16 2 Resistor, Chip, 5.1 Ω, 1/16W, 1% 0603 Std Std

R4 1 Resistor, Chip, 30 kΩ, 1/16W, 1% 0603 Std Std

R5 1 Resistor, Chip, 100 kΩ, 1/16W, 1% 0603 Std Std

R6, R10 2 Resistor, Chip, 130 kΩ, 1/16W, 1% 0603 Std Std

R7, R9 2 Resistor, Chip, 20 kΩ, 1/16W, 1% 0603 Std

R12 1 Resistor, Chip, 13 kΩ, 1/16W, 1% 0603 Std Std

R15 1 Resistor, Chip, 620 Ω, 1/16W, 1% 0603 Std Std

S1 1 Header, 2-pin, 100 mil spacing, (36-pin strip) 0.2 × 0.2 in Sullins PTC36SAAN

SW1, SW2 2 Switch, ON-ON mini toggle 0.28 × 0.18 in Nikkai G-12AP

TP1, TP2, TP3, TP4,

TP5, TP6, TP7 7 Test point, yellow, through-hole 0.125 × 0.125 in Keystone 5014

U1 1 Dual synchronous step-down controller with

OOA operation and 100-mA LDO QFN-24 TI TPS51125ARGE

VBAT, VBAT_GND,

VO1, VO1_GND,

VO2, VO2_GND

6 Pin, wiring terminal 0.12(D) × 0.4 in Mill Max 3138-2-00-15-00-00-080

1 Printed circuit board 3.5 × 2.7 × 0.062

in Any TPS51125AEVM

3 Shunt, 2POs, gold 0.100 × 0.200

inch Molex 15-29-1025

4 Standoff M/F hex 4-40 nylon 0.625 in Keystone 4803

4 Nut hex 4-40 nylon Building

Fasteners NY HN 440

List of Materials www.ti.com

8TPS51125A Buck Controller Evaluation Module User's Guide SLUU408A – FEBRUARY 2010 – REVISED JANUARY 2022

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8 References

Texas Instruments, TPS51125A Dual-Synchronous Buck Controller data sheet

9 Revision History

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

Changes from Revision * (February 2010) to Revision A (January 2022) Page

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

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

www.ti.com References

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TPS51125A Buck Controller Evaluation Module User's Guide 9

STANDARD TERMS FOR EVALUATION MODULES

1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or

documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance

with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.

1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility

evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not

finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For

clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions

set forth herein but rather shall be subject to the applicable terms that accompany such Software

1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,

or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production

system.

2Limited Warranty and Related Remedies/Disclaimers:

2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License

Agreement.

2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM

to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by

neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have

been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications

or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control

techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.

User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)

business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.

2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit

User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty

period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or

replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be

warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day

warranty period.

WARNING

Evaluation Kits are intended solely for use by technically qualified,

professional electronics experts who are familiar with the dangers

and application risks associated with handling electrical mechanical

components, systems, and subsystems.

User shall operate the Evaluation Kit within TI’s recommended

guidelines and any applicable legal or environmental requirements

as well as reasonable and customary safeguards. Failure to set up

and/or operate the Evaluation Kit within TI’s recommended

guidelines may result in personal injury or death or property

damage. Proper set up entails following TI’s instructions for

electrical ratings of interface circuits such as input, output and

electrical loads.

NOTE:

EXPOSURE TO ELECTROSTATIC DISCHARGE (ESD) MAY CAUSE DEGREDATION OR FAILURE OF THE EVALUATION

KIT; TI RECOMMENDS STORAGE OF THE EVALUATION KIT IN A PROTECTIVE ESD BAG.

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