Texas Instruments TPS7A87 Manuale utente

SBVU038–November 2016

TPS7A87 Evaluation Module

User's Guide

SBVU038–November 2016

TPS7A87 Evaluation Module

This user’s guide describes the operational use of the TPS7A8701EVM-852 evaluation module (EVM) as

a reference design for engineering demonstration and evaluation of the TPS7A8701RTJ, dual low-noise,

low-dropout voltage regulator (LDO). Included in this user’s guide are setup and operating instructions,

thermal and layout guidelines, a printed circuit board (PCB) layout, a schematic diagram, and a bill of

materials (BOM).

Throughout this document, the terms demonstration kit, evaluation board, evaluation module are

synonymous with the TPS7A8701EVM-852.

The following related documents are available through the Texas Instruments web site at

http://www.ti.com.

Related Documentation

Device Literature Number

TPS7A87 SBVS281

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Contents

1 Introduction ................................................................................................................... 3

1.1 Before You Begin................................................................................................... 3

2 EVM Setup.................................................................................................................... 4

2.1 Input/Output Connectors and Jumper Descriptions............................................................ 4

2.2 Soldering Guidelines ............................................................................................... 7

2.3 Equipment Connection............................................................................................. 7

3 Operation ..................................................................................................................... 7

4 PCB Layout................................................................................................................... 8

5 Schematic ................................................................................................................... 11

6 Bill of Materials ............................................................................................................. 12

List of Figures

1 Assembly Layer.............................................................................................................. 8

2 Top Layer Routing........................................................................................................... 8

3 Layer 2 Routing.............................................................................................................. 9

4 Layer 3 Routing.............................................................................................................. 9

5 Bottom Layer Routing ..................................................................................................... 10

6 Schematic ................................................................................................................... 11

List of Tables

1 Bill of Materials ............................................................................................................. 12

Trademarks

All trademarks are the property of their respective owners.

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Introduction

SBVU038–November 2016

TPS7A87 Evaluation Module

1 Introduction

The Texas Instruments TPS7A8701EVM-852 EVM helps design engineers evaluate the operation and

performance of the TPS7A87 linear regulator for possible use in their own circuit application. This

particular EVM configuration contains a dual low-noise, high-PSRR linear regulator, ideal for high-

performance signal chain. The regulator is capable of delivering up to 0.5 A per channel to each load with

low dropout (VIN – VOUT) voltage for high-efficiency operation. For stability, each channel requires a 10-

µF input capacitor and 10-µF output capacitor for the TPS7A87.

1.1 Before You Begin

The following warnings and cautions are noted for the safety of anyone using or working close to the

TPS7A8701EVM-852. Observe all safety precautions.

WARNING

Hot surface. Contact may cause burns. Do not touch.

CAUTION

The circuit module may be damaged by overtemperature. To avoid damage,

monitor the temperature during evaluation and provide cooling, as needed, for

your system environment.

CAUTION

Some power supplies can be damaged by application of external voltages. If

using more than one power supply, check your equipment requirements and

use blocking diodes or other isolation techniques, as needed, to prevent

damage to your equipment.

CAUTION

The circuit module is not a finished product or electrical appliance. The module

does not contain current or voltage thresholds for circuit protection. It must be

used by qualified personnel with additional equipment for evaluation only.

EVM Setup

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2 EVM Setup

This section describes how to properly connect and setup the TPS7A8701EVM-852, including the jumpers

and connectors on the EVM board.

2.1 Input/Output Connectors and Jumper Descriptions

2.1.1 J1 – VIN1

Channel-1, input power-supply voltage connector. Twist together the positive input lead and ground return

lead from the input power supply; keep the leads as short as possible to minimize input wire inductance.

Add additional bulk capacitance between J1 and J4 (use the C1 footprint) if the supply leads are longer

than six inches. For example, an additional 47-µF electrolytic capacitor connected from J1 to ground

improves the transient response of the TPS7A87, while eliminating unwanted ringing on the input because

of long wire connections.

2.1.2 J2 – VOUT1

Channel-1, regulated, output voltage connector.

2.1.3 J3 – VPU1

Channel-1, pullup-voltage selector for PG1. This EVM is designed so that PG1 can be pulled up to either

VOUT1 by shorting J3, or pulled up to another voltage by applying an external voltage to the RPU1 post.

2.1.4 J4 – GND

Return connector for the channel-1, input power supply.

2.1.5 J5 – GND

Channel-1, output, ground return connector.

2.1.6 J6 – VIN2

Channel-2, input, power-supply voltage connector. Twist together the positive input lead and ground return

lead from the input power supply; keep the leads as short as possible to minimize input wire inductance.

Add additional bulk capacitance between J6 and J8 (use the C9 footprint) if the supply leads are longer

than six inches. For example, an additional 47-µF electrolytic capacitor connected from J6 to ground

improves the transient response of the TPS7A87, while eliminating unwanted ringing on the input because

of long wire connections.

2.1.7 J7 – VOUT2

Channel-2, regulated, output voltage connector.

2.1.8 J8 – GND

Return connector for the channel-2, input power supply.

2.1.9 J9 – GND

Channel-2, output, ground return connector.

2.1.10 J10 – ANYOUT2

The channel-2 output voltage of the TPS7A87 is selectable in accordance with the names given to the

output voltage setting pins: 50 mV, 100 mV, 200 mV, 400 mV, 800 mV, 1.6 V, and 1.6 V. For each pin

connected to the ground, the output voltage setting increases by the value associated with that pin name,

starting from the value of the reference voltage of 0.8 V; floating the pins has no effect on the output

voltage.

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EVM Setup

SBVU038–November 2016

TPS7A87 Evaluation Module

2.1.11 J11 – ANYOUT1

The channel-1 output voltage of the TPS7A87 is selectable in accordance with the names given to the

output voltage setting pins: 50 mV, 100 mV, 200 mV, 400 mV, 800 mV, 1.6 V, and 1.6 V. For each pin

connected to the ground, the output voltage setting increases by the value associated with that pin name,

starting from the value of the reference voltage of 0.8 V; floating the pins has no effect on the output

voltage.

2.1.12 J12 – VPU2

Channel-2 pullup voltage selector for PG2. This EVM is designed so that PG2 can be pulled up to either

VOUT1 by shorting J12, or pulled up to another voltage by applying an external voltage to the RPU2 post.

2.1.13 J13 – EN1

Channel-1 output enable. To enable the output for channel 1, connect a jumper to short VIN1 to EN1. To

disable the output, connect a jumper to short EN1 to GND.

2.1.14 J14 – EN2

Channel-2 output enable. To enable the output for channel 2, connect a jumper to short VIN2 to EN2. To

disable the output, connect a jumper to short EN2 to GND.

2.1.15 J15 – CTRL1

Channel-1, soft-start control. Connect a jumper to short VIN1 to CTRL1 for a fast charge time. Connect a

jumper to short CTRL1 to GND for a slower startup.

2.1.16 J16 – CTRL2

Channel-2, soft-start control. Connect a jumper to short VIN2 to CTRL2 for a fast charge time. Connect a

jumper to short CTRL2 to GND for a slower startup.

2.1.17 TP1 – VIN1

Channel-1, input, sense test point.

2.1.18 TP2 – VOUT1

Channel-1, output, sense test point.

2.1.19 TP3 – VOUT2

Channel-2, output, sense test point.

2.1.20 TP4 – VIN2

Channel-2, input, sense test point.

2.1.21 TP5 – EN1

Channel-1, enable, sense test point.

2.1.22 TP6 – EN2

Channel-2, enable, sense test point.

2.1.23 TP7 – GND

Ground.

EVM Setup

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2.1.24 TP8 – GND

Ground.

2.1.25 TP9 – GND

Ground.

2.1.26 TP10 – GND

Ground.

2.1.27 TP11 – GND

Ground.

2.1.28 TP12 – GND

Ground.

2.1.29 TP13 – GND

Ground.

2.1.30 TP14 – GND

Ground.

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EVM Setup

SBVU038–November 2016

TPS7A87 Evaluation Module

2.2 Soldering Guidelines

To avoid damaging the integrated circuit (IC), use a hot-air system for any solder rework to modify the

EVM for the purpose of repair or other application reasons.

2.3 Equipment Connection

1. Set the input power supplies for each channel to 6.5 V (max), and turn the power supplies off.

2. Connect the positive voltage lead from input power supply 1 to VIN1, at the J1 connector of the EVM.

3. Connect the ground lead from input power supply 1 to GND at the J4 connector of the EVM.

4. Connect the positive voltage lead from input power supply 2 to VIN2, at the J6 connector of the EVM.

5. Connect the ground lead from input power supply 2 to GND at the J7 connector of the EVM.

6. Connect a 0-A to 0.5-A load between OUT1 and GND.

7. Connect a 0-A to 0.5-A load between OUT2 and GND.

8. Disable the output for channel 1 by shorting EN1 to GND on J13.

9. Disable the output for channel 2 by shorting EN2 to GND on J14.

3 Operation

1. Turn on the power supplies.

2. Enable the channel 1 output by shorting the EN1 pin to VIN1 on J13.

3. Enable the channel 2 output by shorting the EN2 pin to VIN2 on J14.

4. Vary the respective load and input voltage, as necessary, for test purposes.

PCB Layout

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4 PCB Layout

Figure 1 to Figure 5 illustrate the PCB layout for this EVM.

Figure 1. Assembly Layer

Figure 2. Top Layer Routing

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PCB Layout

SBVU038–November 2016

TPS7A87 Evaluation Module

Figure 3. Layer 2 Routing

Figure 4. Layer 3 Routing

PCB Layout

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Figure 5. Bottom Layer Routing

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