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User's Guide

SLVU402–October 2010

TPS65708EVM

This user’s guide describes the characteristics, operation, and use of the TPS65708 evaluation module

(EVM). The TPS65708EVM-587 is a fully assembled and tested circuit for evaluating the performance of

the TPS65708 four-channel power management unit (PMU). This document includes schematic diagrams,

a printed circuit board (PCB) layout, bill of materials, and test data. Throughout this document, the

abbreviation EVM and the term evaluation module are synonymous with the TPS65708EVM-587 unless

otherwise noted.

Contents

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

1.1 Features ............................................................................................................. 2

1.2 Applications ......................................................................................................... 2

1.3 Power-Supply Requirements ..................................................................................... 2

1.4 Additional Requirements .......................................................................................... 2

2 TPS65708EVM Output Voltages and Current ........................................................................... 2

3 TPS65708EVM Schematic ................................................................................................ 3

4 Connector and Test Point Descriptions .................................................................................. 4

4.1 Enable Jumpers/Switches (RefDes) TPS65708 ............................................................... 4

5 Test Configuration .......................................................................................................... 7

5.1 Hardware Setup .................................................................................................... 7

5.2 Procedure ........................................................................................................... 8

6 TPS65708EVM Assembly Drawings and Layout ....................................................................... 9

7 Bill of Materials ............................................................................................................. 14

List of Figures

1 TPS65708EVM Schematic ................................................................................................ 3

2 Hardware Board Connection .............................................................................................. 7

3 TPS65708EVM Component Placement (Top View).................................................................... 9

4 TPS65708EVM Top-Side Copper (Top View) ......................................................................... 10

5 TPS65708EVM Internal Layer 1 (Top View)........................................................................... 11

6 TPS65708EVM Internal Layer 2 (Top View)........................................................................... 12

7 TPS65708EVM Bottom-Side Copper (Bottom View) ................................................................. 13

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SLVU402–October 2010 TPS65708EVM

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Summary of content (16 pages)

PAGE 1
User's Guide SLVU402 – October 2010 TPS65708EVM This user’s guide describes the characteristics, operation, and use of the TPS65708 evaluation module (EVM). The TPS65708EVM-587 is a fully assembled and tested circuit for evaluating the performance of the TPS65708 four-channel power management unit (PMU). This document includes schematic diagrams, a printed circuit board (PCB) layout, bill of materials, and test data.
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Introduction 1 www.ti.com Introduction The TPS65708 is a small PMU designed for embedded camera modules or other portable, low-power consumer end equipment. It contains two high-efficiency step-down converters, two low-dropout linear regulators (LDOs), and a 7.5-mA current sink for driving an LED. The TPS65708EVM-587 is a fully assembled and tested platform for evaluating the operation and performance of the TPS65708 PMU device. 1.1 Features • • • • • 1.2 Applications • • 1.
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TPS65708EVM Schematic www.ti.com 3 TPS65708EVM Schematic Figure 1 illustrates the TPS65708EVM-587 schematic. NOTE: For reference only; see Table 2 for specific values. Figure 1.
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Connector and Test Point Descriptions www.ti.com 4 Connector and Test Point Descriptions 4.1 Enable Jumpers/Switches (RefDes) TPS65708 4.1.1 J1 VLDO1 This header is the positive output of the LDO1 linear regulator. The default output voltage of the LDO is 2.8 V . The LDO is capable of sourcing up to 200 mA. A load can be connected between J1 and J3 (GND). 4.1.2 J2 S+/S– J2 S+/S– are the sense connection for the output of LDO1.
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Connector and Test Point Descriptions www.ti.com 4.1.10 J9 S+/S– J9 S+/S– are the sense connection for the output of VLDO2. Connect a voltmeter, sense connection of an electronic load, or oscilloscope to this header. 4.1.11 J10 GND J10 is the return connection of LDO2. A load can be connected between J8 (VLDO2) and J10 (GND). The LDO is capable of sourcing up to 200 mA. 4.1.12 J11 VOUTDCDC2 This header is the positive output of the VDCDC2 step-down converter.
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Connector and Test Point Descriptions 4.1.21 www.ti.com J20 PWM_LED/GND J20, pin 1 is the PWM input connection for the LED current sink. Use a signal generator, for example, to drive this input. The PWM dimming frequency can be up to 50 kHz, and the duty cycle should be in the range of 5% to 100%. At a 100% duty cycle, the LED current is 7.5 mA. Average LED current decreases with a decreasing duty cycle.
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Test Configuration www.ti.com 5 Test Configuration 5.1 Hardware Setup Figure 2 illustrates a typical hardware test configuration. Oscilloscope Load PWM J1 J2 J3 VOUT S+ S- GND LDO1 J4 J5 J6 GND VIN LDO1 J20 J7 VIN GND LDO2 GND PWM_LED VOUT LDO2 J10 J22 S+ S- J19 GND S+ S- TPS65708EVM HPA587 J9 J18 DC Power Supply GND LED Cathode JP1 GND S+ S- DCDC1 J16 J15 Load J14 DCDC2 S+ S- GND J11 J12 JP2 ISINK MODE PSM PWM - Load J8 J17 VIN + J13 Load Figure 2.
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Test Configuration 5.2 www.ti.com Procedure Follow these procedures when configuring the EVM for testing. CAUTION Many of the components on the TPS65708EVM-587 are susceptible to damage by electrostatic discharge (ESD). Customers are advised to observe proper ESD handling precautions when unpacking and handling the EVM, including the use of a grounded wrist strap, bootstraps, or mats at an approved ESD workstation. An electrostatic smock and safety glasses should also be worn. 1.
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TPS65708EVM Assembly Drawings and Layout www.ti.com 6 TPS65708EVM Assembly Drawings and Layout Figure 3 through Figure 7 show the design of the show the design of the TPS65708EVM-587 printed circuit board. The EVM has been designed using a four-layer, 1-ounce copper-clad PCB. NOTE: Board layouts are not to scale. These figures are intended to show how the board is laid out; they are not intended to be used for manufacturing TPS65708EVM-587 PCBs. TEXAS INSTRUMENTS Figure 3.
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TPS65708EVM Assembly Drawings and Layout www.ti.com Figure 4.
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www.ti.com TPS65708EVM Assembly Drawings and Layout Figure 5.
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TPS65708EVM Assembly Drawings and Layout www.ti.com Figure 6.
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TPS65708EVM Assembly Drawings and Layout www.ti.com Figure 7.
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Bill of Materials 7 www.ti.com Bill of Materials Table 2 lists the bill of materials for the TPS65708EVM. Table 2. TPS65708EVM-587 Bill of Materials Count RefDes Value Description Size Part Number MFR 0 C1, C5, C8, C9, C11, C14 Open Capacitor, Ceramic 0603 Std Std 2 C2, C6 2.2 µF Capacitor, Ceramic, 6.3 V, X5R, 10% 0603 GRM188R60J225KE19D muRata 2 C3, C4 4.7 µF Capacitor, Ceramic, 6.3 V, X5R, 10 0603 GRM188R60J475KE19D muRata 4 C7, C10, C12, C13 10 µF Capacitor, Ceramic, 6.
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Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.