Texas Instruments TPS51125 Bedienungsanleitung

User’s Guide

TPS51125 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.......................................................................................................................................................................... 6

6 Physical Layouts.................................................................................................................................................................... 7

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

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

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

Trademarks

Out-of-Audio™ and D-CAP™ are trademarks of Texas Instruments.

All trademarks are the property of their respective owners.

www.ti.com Table of Contents

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TPS51125 Buck Controller Evaluation Module User's Guide 1

1 Introduction

The TPS51125 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 TPS51125 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 TPS51125EVM 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. TPS51125-EVM Schematic Diagram

www.ti.com Schematic

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TPS51125 Buck Controller Evaluation Module User's Guide 3

4 Test Setup and Results

4.1 Test Setup

Connect the test equipment and TPS51125EVM board as shown in Figure 4-1.

12V/10A

Power Supply

Electronic

Load1

Electronic

Load2

DMM1

DMM2

DMM3

DMM4

Oscilloscope

CH1

CH2

Oscilloscope

VO2_GND

VO2

CN2

VO1

VO1_GND

VBAT_GND

VBAT

TP1

CN1

HPA312

TPS51125EVM

1MW

12V/10A

Power Supply

Electronic

Load1

Electronic

Load2

DMM1

DMM2

DMM3

DMM4

Oscilloscope

CH1

CH2

Oscilloscope

VO2_GND

VO2

CN2

VO1

VO1_GND

VBAT_GND

VBAT

TP1

CN1

HPA312

TPS51125EVM

VO2_GND

VO2

CN2

VO1

VO1_GND

VBAT_GND

VBAT

TP1

CN1

HPA312

TPS51125EVM

1MW

Figure 4-1. Equipment Setup for TPS51125EVM 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 shunt jumper for JP2 is set to 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.

Test Setup and Results www.ti.com

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4.3 Start-Up Performance

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

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

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TPS51125 Buck Controller Evaluation Module User's Guide 5

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

Configuration www.ti.com

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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

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TPS51125 Buck Controller Evaluation Module User's Guide 7

Figure 6-2. Bottom Layer Routing

Figure 6-3. Inner Layer 1

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Figure 6-4. Inner Layer 2

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TPS51125 Buck Controller Evaluation Module User's Guide 9

7 List of Materials

Table 7-1. TPS51125 List of Materials

RERERENCE

DESIGNATOR QTY DESCRIPTION SIZE MFR PART NUMBER

C1, C2, C3, C4, C13,

C23 6 Capacitor, Ceramic, 100 nF, 50 V, X5R, 10% 0603 muRata GRM188B31H104K

C5 1 Capacitor, Ceramic, 1 μF, 25 V, X5R, 10% 0805 TDK C2012X5R1E105K

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 1 Capacitor, Ceramic, 10 μF, 6.3 V, X5R, 10% 0805 TDK C2012X5R0J106K

C17 1 Capacitor, Ceramic, 33 μF, 6.3 V, X5R, 20% 1206 TDK C3216JB0J336M

C19 1 Capacitor, Ceramic, 220 nF, 50 V, X5R, 10% 0603 muRata GRM188B31C224K

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, 7.3 mΩ, 14 A, SMT 0.425 × 0.45 in Toko FDA1055-3R3M

Q1, Q3 2 MOSFET, N-channel, 30 V, 11 A, 9.1 mΩ SO8 IR IRF7821

Q2, Q4 2 MOSFET, N-channel, 30 V, 11 A, 12.5 mΩ SO8 Fairchild FDS6690AS

R1 0 Resistor 0603 Any Any

R2 1 Resistor, Chip, 100 kΩ, 1/16W, 1% 0603 Std Std

R3, R10, R13, R15 4 Resistor, Chip, 0 Ω, 1/16 W, 1% 0603 Std Std

R4, R14 2 Resistor, Chip, 5.1 Ω, 1/16W, 1% 0603 Std Std

R5 1 Resistor, Chip, 30 kΩ, 1/16W, 1% 0603 Std Std

R6, R8 2 Resistor, Chip, 130 kΩ, 1/16W, 1% 0603 Std Std

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

R11 1 Resistor, Chip, 13 kΩ, 1/16W, 1% 0603 Std Std

R12 1 Resistor, Chip, 620 kΩ, 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, SW3 3 Switch, ON-ON mini toggle 0.28 × 0.18 in Nikkai G-12AP

SW4 0 Switch, ON-ON mini toggle 0.28 × 0.18 in Any Any

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 TPS51125RGE

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 TPS51125EVM

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

List of Materials www.ti.com

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