Texas Instruments TPS51124 User manual

User’s Guide

TPS51124 Buck Controller Evaluation Module User's

Guide

Table of Contents

1 Description.............................................................................................................................................................................. 2

2 Electrical Performance...........................................................................................................................................................2

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

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

4.1 Test Setup.......................................................................................................................................................................... 4

4.2 Test Procedure................................................................................................................................................................... 4

4.3 Start-Up Performance........................................................................................................................................................ 5

4.4 Transient Performance.......................................................................................................................................................5

5 Configuration.......................................................................................................................................................................... 6

5.1 Switching Frequency Selection.......................................................................................................................................... 6

5.2 Bootstrap Diode Selection..................................................................................................................................................6

6 EVM Assembly Drawing and PCB Layout............................................................................................................................ 7

7 List of Materials.....................................................................................................................................................................10

8 References.............................................................................................................................................................................11

9 Revision History....................................................................................................................................................................11

Trademarks

D-CAP™ is a trademark of Texas Instruments.

All trademarks are the property of their respective owners.

www.ti.com Table of Contents

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TPS51124 Buck Controller Evaluation Module User's Guide 1

1 Description

The TPS51124 is a dual, adaptive on-time D-CAP™ mode synchronous buck controller. The part enables system

designers to cost-effectively complete the suite of notebook power bus regulators with the absolute lowest

external component count and lowest standby consumption. The fixed frequency emulated adaptive on-time

control supports seamless operation between PWM mode at heavy load condition and reduced frequency

operation at light load for high efficiency down to milli-ampere range. The main control loop for the TPS51124

uses D-CAP mode that is optimized for low-ESR output capacitors such as POSCAP or SP-CAP promises fast

transient response with no external compensation. Simple and separate power-good signals for each channel

allow flexibility of power sequencing. The part provides a convenient and efficient operation with supply input

voltages (V5IN, V5FILT) ranging from 4.5 V to 5.5 V, conversion voltages (drain voltage for the synchronous

high-side MOSFET) from 3 V to 28 V, and output voltages from 0.76 V to 5.5 V.

The HPA178 (TPS51124EVM) evaluation module is a high efficiency, dual synchronous buck converter providing

1.05 V at 10 A and 1.5 V at 10 A from 5-V to 25-V input. This user’s guide describes the HPA178 performance in

medium switching frequency.

2 Electrical Performance

SPECIFICATIONS TEST CONDITIONS MIN TYP MAX UNIT

Input voltage range (V5IN) 4.5 5.0 5.5 V

Input voltage range (VIN) 5 12 25 V

CH1

Output voltage 1.05 V

Operating frequency TONSEL: Float

VIN = 12 V, IOUT1 = 10 A 300 kHz

Output current 10 A

Overcurrent limit VIN = 12 V 13 A

Output ripple voltage VIN = 12 V,IOUT = 10 A 35 mVp-p

CH2

Output voltage 1.5 V

Operating frequency TONSEL: Float

VIN = 12 V, IOUT2 = 10 A 360 kHz

Output current 10 A

Overcurrent limit VIN = 12 V 13 A

Output ripple voltage VIN = 12 V, IOUT2 = 10 A 35 mVp-p

Description www.ti.com

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3 Schematic

Figure 3-1. TPS51124 EVM Schematic Diagram

www.ti.com Schematic

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TPS51124 Buck Controller Evaluation Module User's Guide 3

4 Test Setup and Results

4.1 Test Setup

Connect the test equipment and HPA178 EVM board as shown in Figure 4-1.

HPA178

TPS51124EVM-001

-Electronic

Load2

Oscilloscope

CH2

Electronic

Load1

Oscilloscope

CH1

VO1

VO1_GND

VO2

VO2_GND

12V/10A

Power supply

VIN

_GND

VIN

DMM3

DMM2

DMM1

V5IN

_GND

V5IN CN1

CN2

+ -

DMM4

+ -

5V/1A

Power supply

TP7

TP8

TP4

TP10 TP5

TP6

TP3

TP9

FAN

Figure 4-1. Equipment Setup for HPA178 EVM Board

4.2 Test Procedure

1. Ensure the switches SW1 (EN1) and SW2 (EN2) are in the “OFF” position.

2. Ensure the shunt jumper for JP1 is set 3-pin to 4-pin (Med).

3. Apply appropriate V5IN voltage to V5IN and V5IN_GND terminals.

4. Apply appropriate VIN voltage to VIN and VIN_GND terminals.

5. Turn on SW1 (EN1). The CH1-output will start up.

6. Turn on SW2 (EN2). The CH2-output will start up.

Test Setup and Results www.ti.com

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4.3 Start-Up Performance

Figure 4-2. 1.05-V Start-Up Performance Figure 4-3. 1.5-V Start-Up Performance

4.4 Transient Performance

Figure 4-4. 1.05-V Load Transient Performance Figure 4-5. 1.5-V Load Transient Performance

www.ti.com Test Setup and Results

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TPS51124 Buck Controller Evaluation Module User's Guide 5

5 Configuration

This EVM could be set to the desired configurations of the user.

Please refer to the following specific configuration setting sections.

5.1 Switching Frequency Selection

Switching frequency can be set by the TONSEL pin using JP1 on the EVM. The default setting is medium.

Table 5-1. Switching Frequency Selection

Jumper (JP1) Set to TONSEL Frequency(1)

Typ CH1 CH2

Top(1-2 pin shorted) GND Slow 240 kHz 300 kHz

CENTER(3-4 pin shorted) Float Medium 300 kHz 360 kHz

Bottom(5-6 pin shorted) V5FILT Fast 360 kHz 420 kHz

(1) Frequencies are approximate.

5.2 Bootstrap Diode Selection

Bootstrap diodes (D1, D2) are not populated on this EVM since the TPS51124 has them built in. External

Schottky diodes can be added in order to further improve the efficiency.

Configuration www.ti.com

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6 EVM Assembly Drawing and PCB Layout

Figure 6-1. Top Assembly

Figure 6-2. Top Layer

www.ti.com EVM Assembly Drawing and PCB Layout

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TPS51124 Buck Controller Evaluation Module User's Guide 7

Figure 6-3. Inner Layer 1

Figure 6-4. Inner Layer 2

EVM Assembly Drawing and PCB Layout www.ti.com

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Figure 6-5. Bottom Layer

www.ti.com EVM Assembly Drawing and PCB Layout

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TPS51124 Buck Controller Evaluation Module User's Guide 9

7 List of Materials

Reference

Designator

QTY Description Size Mfr Part Number

— 1 Shunt,100-mil, Black 0.100 3M 929950-00

C1 0 Capacitor,Aluminum 0.26 × 0.26 inch Any Any

C13, C14 2 Capacitor, POSCAP, 330 mF, 2.5-

V18-mW, 20%

7343 SANYO 2R5TPE330MI

C15 1 Capacitor,Ceramic, 4.7 mF,6.3 V, BJ,

20%

0805 TDK C2012X5R0J475K

C16 1 Capacitor,Ceramic, 1 mF,6.3 V, BJ,

20%

0805 TDK C2012X5R0J105K

C17 1 Capacitor,Ceramic, 18 pF, 50 V, BJ,

20%

0805 Std Std

C2, C3, C4, C5 4 Capacitor,Ceramic, 10 mF,25 V, BJ ,

20%

1210 TDK /

TaiyoYuden

C3225JB1E106 /

TMK325BJ106MM

C6, C11 2 Capacitor,Ceramic, 0.1 mF,50 V, BJ,

20%

0805 Std Std

C7, C8 2 Capacitor, POSCAP, 330 mF, 2.5-

V15-mW, 20%

7343 SANYO 2R5TPE330MF

C9, C10, C12, C18 0 Capacitor,Ceramic 0805 Any Any

CN1, CN2 2 Adaptor, 3.5-mm probe clip (or

131-5031-00)

0.2 Tektronix 131-4244-00

D1, D2 0 Diode,Schottky, 0.5 A, 30 V SOD-123 Any Any

J1, J2 2 TerminalBlock, 2-pin, 15 A, 5.1 mm 0.40 × 0.35 inch OST ED1609

JP1 1 Header, 2×3-pin,100mil spacing (36-

pin strip)

0.20 × 0.30 inch Sullins PTC36DAAN

L1, L2 2 Inductor,1.0 μH, 20.5 A, 2 mW 0.496 × 0.532 inch TOKO FDA1254-1R0M

Q1, Q3 2 MOSFET,N-ch, 30 V, 11 A, 12.5 mW SO8 IR IRF7821

Q2, Q4 2 MOSFET,N-ch, 30 V, 13.8 A, 6.8 mW SO8 IR IRF8113

R1, R7 2 Resistor,Chip, 100 kW,1/10W, 1% 0805 Std Std

R12, R13 0 Resistor,Chip 0805 Std Std

R2, R9, R10 3 Resistor,Chip, 3.3 W,1/10W, 1% 0805 Std Std

R3 1 Resistor,Chip, 28.7 kW,1/10W, 1% 0805 Std Std

R4, R6 2 Resistor,Chip, 75 kW,1/10W, 1% 0805 Std Std

R5 1 Resistor,Chip, 73.2 kW,1/10W, 1% 0805 Std Std

R8, R11 2 Resistor,Chip, 6.8 kW,1/10W, 1% 0805 Std Std

SW1, SW2 2 Switch,ON-ON Mini Toggle 0.28 × 0.18 inch Nikkai G12AP

TP1, TP2 2 Testpoint, White, Thru hole 0.125× 0.125 inch Keystone 5012

TP10 1 Testpoint, Orange, Thru hole 0.125× 0.125 inch Keystone 5013

TP3, TP4, TP5, TP6 4 Testpoint, Black, Thru hole 0.125× 0.125 inch Keystone 5011

TP7, TP8 2 Testpoint, Yellow, Thru hole 0.125× 0.125 inch Keystone 5014

TP9 1 Testpoint, Red, Thru hole 0.125× 0.125 inch Keystone 5010

U1 1 IC, Dual Synchronous Step-Down

Controller for Low Voltage Power

Rails

QFN32 TI TPS51124RHB

VIN_GND,VIN,

V5IN,V5IN_GND

4 Pin,Wiring Terminal 0.09(D) × 0.31 inch MillMax 3183-2-00-15-00-

00-080

List of Materials www.ti.com

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