Texas Instruments TPS51385EVM User manual

EVM User's Guide: TPS51385EVM

TPS51385 Step-Down Converter Evaluation Module

Description

The TPS51385 is a single, D-CAP3™ control mode,

synchronous buck converter requiring a very low

external component count. TPS51385EVM is a fully

assembled and tested circuit for evaluating the

TPS51385 converter. This EVM operates typical 12-V

input, and provides a 5.1-V output at 7-A.

Features

• 4.5-V to 24-V input voltage range

• 0.6-V to 5.5-V output voltage range

• Support 7-A continuous output current

• Selectable PSM and OOA mode under light load

• Fast load transient response

Applications

•Notebook and PC computers

•Ultrabook, tablet computers

•TV , STB

• Distributed power systems

Top View of TPS51385EVM

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TPS51385 Step-Down Converter Evaluation Module 1

1 Evaluation Module Overview

1.1 Introduction

The TPS51385 evaluation module (EVM) is a single, synchronous buck converter providing 5.1-V at 7-A from a

6-V to 24-V input. This user’s guide describes the TPS51385EVM performance.

Table 1-1. Input Voltage and Output Current Summary

EVM Input Voltage (VIN) Range Output Current (IOUT) Range

TPS51385EVM 6 V to 24 V 0 A to 7 A

This user's guide describes the characteristics, operation, and use of the Texas Instruments TPS51385

evaluation module (EVM). The TPS51385EVM is designed to help user easily evaluate and test the operation

and functionality of the TPS51385. This user's guide includes the following:

• Setup instructions for the hardware

• Printed-circuit board layouts for the EVM

• Schematic diagram

• Bills of material

• Test results for the EVM

1.2 Kit Contents

• One TPS51385EVM board

• EVM disclaimer Read Me

1.3 Specification

A summary of the TPS51385EVM performance specifications is provided in Table 1-2. Specifications are given

for 12-V input voltage and 5.1-V output voltage, unless otherwise noted. The ambient temperature is 25°C for all

measurement, unless otherwise noted.

Table 1-2. TPS51385EVM Performance Specifications Summary

Specifications Test Conditions MIN TYP MAX Unit

VIN Input voltage 6 12 24 V

CH1

Output voltage 5.1 V

Operating frequency VIN = 12 V, IOUT = 7 A 1000 kHz

Output current range 0 7 A

Overcurrent limit VIN = 12 V, LOUT = 1 µH 8.8 A

Output ripple voltage VIN = 12 V, IOUT = 7 A 20 mVPP

1.4 Device Information

TPS51385 is the main device on the EVM board. The TPS51385 is a single, D-CAP3™ control mode,

synchronous buck converter requiring a very low external component count. Features include an accurate

reference voltage, fast load transient response, auto-skip mode operation for light load efficiency, OOA light load

operation with > 25-kHz switching frequency, D-CAP3control mode with good line, load regulation, and does not

require external compensation.

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2 Hardware

2.1 Input and Output Connections

The TPS51385EVM is provided with input and output connectors and test points as shown in Table 2-1. Test

point TP2 provides a place to monitor the VIN input voltages with TP9 providing a convenient ground reference.

TP5 is used to monitor the output voltage with TP12 as the ground reference.

Table 2-1. Connection and Test Points

Reference

Designator Function

J1 VIN (see Table 1-1 for VIN range)

J2 VOUT, 5.1 V at 7-A maximum

JP1 PG pullup control. Short pin 1 and pin 2 to pull PG up to VCC.

JP2 EN high control. Short pin 1 and pin 2 to connect VIN to pin 1 of JP3.

JP3 EN control. Short pin 1 and pin 2 of JP2 to make EN high.

JP4 Mode control. Float or short pin 2 and pin 3 to set PSM mode. Short pin 2 and

pin 1 to set OOA mode.

TP1 VIN positive monitor point

TP2 VIN positive test point

TP3 Switch node (SW) test point

TP4 VOUT positive monitor point

TP5 VOUT positive test point

TP6 EN test point

TP7 PG test point

TP8 GND monitor point

TP9 GND test point

TP10 GND monitor point

TP11 Loop test point

TP12 GND test point

TP13 VCC test point

TP14, TP15, TP16 GND test point

2.2 Modifications

The evaluation module is designed to provide access to the features of the TPS51385. Some modifications can

be made to this module.

2.2.1 Output Voltage Setpoint

To change the output voltage of the EVM, change the value of resistor R4 (Rupper) and R6 (Rlower). The value of

R4 and R6 for a specific output voltage can be calculated using Equation 1.

)

1(6.0V

LOWER

UPPER

OUT u

(1)

2.2.2 Mode Selection

TPS51385 has a MODE pin that can offer two different options of light load performance, as shown in Table 2-2.

Table 2-2. MODE Pin Settings

MODE Pin Light Load Performance

Connect Pin2(MODE) to Pin3(L) of JP4 or leave MODE pin floating PSM

Connect Pin2(MODE) to Pin1(H) of JP4 OOA

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TPS51385 Step-Down Converter Evaluation Module 3

3 Implementation Results

This section describes how to properly connect, set up, and use the TPS51385EVM. The section also includes

test results typical for the evaluation modules.

3.1 Evaluation Setup

1. Make sure that the jumper at JP2 (Enable High Control) is covered to connect VIN to pin 1 of JP3. Also

make sure JP3 (Enable Control) pin 2 and 3 are covered to shunt EN to GND to disable the output.

2. Apply appropriate input voltage to VIN (J1-1) or TP1 and GND (J1-2) or TP8. Connect a power supply

capable of supplying 7-A to J1 through a pair of 20AWG wires. Note that the board cannot support hot

plug-in. The input lines must be connected between J1 and an external power source first before turning on

the power source.

3. Move the jumper at JP3 (Enable Control) from pin 2 and 3 (EN and OFF) to pin 2 and 1 (EN and ON) and

make sure JP2 pin 1 and pin 2 are covered. Then, the output can be enabled.

4. Apply the loading to VOUT (J2-2) or TP4 and GND (J2-1) or TP10. The load must be connected to J2

through a pair of 20AWG wires. The maximum load current capability is 7 A. Minimize wire lengths to reduce

losses in the wires.

3.2 Test Setup and Results

3.2.1 Start-Up

The following figures show the TPS51385EVM start-up waveform relative to EN.

VOUT=2V/div

PG=5V/div

IL=2A/div

EN=5V/div

Figure 3-1. Start-Up Relative to EN, IOUT = 0.1 A (2ms/div)

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VOUT=2V/div

PG=5V/div

IL=5A/div

EN=5V/div

Figure 3-2. Start-Up Relative to EN, IOUT = 7 A (2ms/div)

3.2.2 Shutdown

The following figures show the TPS51385EVM shutdown waveform relative to EN.

VOUT=2V/div

PG=5V/div

IL=2A/div

EN=5V/div

Figure 3-3. Shutdown Relative to EN, IOUT = 0.1 A (2ms/div)

VOUT=2V/div

PG=5V/div

IL=5A/div

EN=5V/div

Figure 3-4. Shutdown Relative to EN, IOUT = 7 A (2ms/div)

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TPS51385 Step-Down Converter Evaluation Module 5

3.2.3 Output Voltage Ripple

The following images show the TPS51385EVM output voltage ripple.

VOUT=20mV/div (AC coupled)

SW=5V/div

Figure 3-5. TPS51385EVM Output Voltage Ripple, IOUT = 10 mA, PSM Mode (100us/div)

VOUT=20mV/div (AC coupled)

SW=5V/div

Figure 3-6. TPS51385EVM Output Voltage Ripple, IOUT = 10 mA, OOA Mode (10us/div)

VOUT=20mV/div (AC coupled)

SW=5V/div

Figure 3-7. TPS51385EVM Output Voltage Ripple, IOUT = 7 A (1us/div)

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4 Hardware Design Files

4.1 Schematic

The following image shows the schematic for the TPS51385EVM.

Figure 4-1. TPS51385EVM Schematic Diagram

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4.2 PCB Layout

The following figures show the board layout for the TPS51385EVM. TPS51385EVM is with four layers. The top

layer contains the main power traces for VIN, VOUT, and GND. Also on the top layer are connections for the pins

of the TPS51385 and a large area filled with ground. Most of the signal traces are also located on the top side.

The input decoupling capacitors C4, C5, and C6 are located as close to VIN pins and PGND pins of the IC as

possible. The input and output connectors, test points, and all of the components are located on the top side.

The bottom layer is a ground plane along with signal ground copper fill and the feedback trace from the point of

regulation to the top of the resistor divider network. Two inner layers are ground plane.

Figure 4-2. Top Assembly

Figure 4-3. Top Layer

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Figure 4-4. Inner1 Layer

Figure 4-5. Inner2 Layer

Figure 4-6. Bottom Layer

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4.3 Bill of Materials

The following table displays the TPS51385EVM bill of materials.

Table 4-1. Bill of Materials

Designator Qty Description Part Number Manufacturer(1)

C1, C6 2 CAP, CERM, 0.1 µF, 25 V, ±10%, X5R, 0603 CL10A104KA8NNNC Samsung Electro-

Mechanics

C4, C5 2 CAP, CERM, 10 μF, 35 V, ±10%, X5R, 0805 GRM21BR6YA106KE43L MuRata

C7, C8, C9 3 CAP, CERM, 22 μF, 10 V, ±20%, X5R, 0805 GRM21BR61A226ME44L MuRata

C12 1 CAP, CERM, 22 pF, 50 V, ±5%, C0G/NP0, 0603 C0603C220J5GACTU Kemet

C13 1 CAP, CERM, 1 μF, 10 V, ±10%, X5R, 0603 C0603C105K8PACTU Kemet

C14 1 CAP, CERM, 0.022 μF, 16 V, ±10%, X7R, 0603 C0603C220J5GACTU Kemet

C15 1 CAP, CERM, 0.01 μF, 16 V, ±10%, X7R, 0603 C0603C103K4RACTU Kemet

D1 1 Diode, Zener, 5.1 V, 200 mW, SOD-323 MMSZ5231BS-7-F Diodes Inc.

H1, H2, H3,

H4 4 Bumpon, Hemisphere, 0.44 × 0.20, Clear SJ-5303 (CLEAR) 3M

J1, J2 2 Terminal Block, 5.08 mm, 2 × 1, Brass, TH ED120/2DS On-Shore Technology

JP1, JP2 2 Header, 100mil, 2 × 1, Gold, TH PBC02SAAN Sullins Connector Solutions

JP3, JP4 2 Header, 100mil, 3 × 1, Tin, TH PEC03SAAN Sullins Connector Solutions

L1 1 Inductor, 1 μH, 14.4 A, 0.0064 Ω, SMD CMLE063T-1R0MS Cyntec

LBL1 1 Thermal Transfer Printable Labels, 1.250" W × 0.250" H

– 10,000 per roll THT-13-457-10 Brady

R1, R5 2 RES, 0, 5%, 0.1 W, 0603 RC0603JR-070RL Yageo

R2 1 RES, 51, 5%, 0.1 W, AEC-Q200 Grade 0, 0603 CRCW060351R0JNEA Vishay-Dale

R3 1 RES, 100 k, 5%, 0.1 W, 0603 CRCW0603100KJNEAC Vishay-Dale

R4 1 RES, 150 k, 1%, 0.1 W, 0603 RC0603FR-07150KL Yageo

R6 1 RES, 20.0 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 ERJ-3EKF2002V Panasonic

R7, R8, R9 3 RES, 20.0 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 CRCW060320K0FKEA Vishay-Dale

SH-JP1, SH-

JP2, SH-JP3,

SH-JP4

4 Shunt, 100 mil, Gold plated, Black SNT-100-BK-G Samtec

TP1, TP4,

TP8, TP10 4 Terminal, Turret, TH, Triple 1598-2 Keystone

TP2, TP3,

TP5, TP6,

TP7, TP11,

TP13

7 Test Point, Miniature, Red, TH 5000 Keystone

TP9, TP12,

TP14, TP15,

TP16

5 Test Point, Miniature, Black, TH 5001 Keystone

U1 1 4.5-V to 24-V Input, 7-A Synchronous Buck Converter TPS51385RJNR Texas Instruments

C2, C3 0 CAP, CERM, 10 μF, 35 V, ±10%, X5R, 0805 GRM21BR6YA106KE43L MuRata

C10, C11 0 CAP, CERM, 22 μF, 10 V, ±20%, X5R, 0805 GRM21BR61A226ME44L MuRata

(1) Unless otherwise noted in the Alternate Part Number or Alternate Manufacturer columns, all parts can be substituted with equivalents.

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