Texas Instruments bq25606, PWR772 User Manual

User's Guide

SLUUBL3A–June 2017–Revised October 2017

bq25606 PWR772 Evaluation Module

This user's guide provides detailed testing instructions for the bq25606 evaluation module (EVM). Also included are descriptions of the necessary equipment, equipment setup, test procedures, the printedcircuit board layouts, schematics, and the bill of materials (BOM).

Throughout this user's guide, the abbreviations EVM, bq25606EVM, PWR772, and the term evaluation module are synonymous with the bq25606 evaluation module, unless otherwise noted.

Contents

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

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

1.2 I/O Descriptions ..................................................................................................... 2

2 Test Summary................................................................................................................ 3

2.1 Equipment ........................................................................................................... 3

2.2 Equipment Setup.................................................................................................... 3

2.3 Test Procedure...................................................................................................... 5

3 PCB Layout Guideline....................................................................................................... 6

4 Board Layout ................................................................................................................. 7

5 Schematic..................................................................................................................... 9

6 Bill of Materials ............................................................................................................. 10

1 Original Test Setup for bq25606 EVM.................................................................................... 4

2 bq25606EVM Top Overlay ................................................................................................. 7

3 bq25606EVM Top Solder Mask............................................................................................ 7

4 bq25606EVM Top Layer ................................................................................................... 7

5 bq25606EVM Signal Layer 1 .............................................................................................. 7

6 bq25606EVM Signal Layer 2 .............................................................................................. 7

7 bq25606EVM Bottom Layer ............................................................................................... 7

8 bq25606EVM Bottom Solder Mask........................................................................................ 8

9 bq25606EVM Bottom Overlay ............................................................................................. 8

10 Schematic for bq25606EVM-772.......................................................................................... 9

1 Device Data Sheets ......................................................................................................... 2

2 EVM Connections............................................................................................................ 2

3 EVM Jumper Connections and Shunt Installation....................................................................... 2

4 Recommended Operating Conditions..................................................................................... 3

5 bq25606EVM-772 BOM ................................................................................................... 10

Trademarks

All trademarks are the property of their respective owners.

List of Figures

List of Tables

SLUUBL3A–June 2017–Revised October 2017

Submit Documentation Feedback

bq25606 PWR772 Evaluation Module

Introduction

1 Introduction

1.1 EVM Features

For detailed features and operation, refer to Table 1 for a list of devices and their data sheets.

Device Data Sheet EVM Label Variant

bq25606 SLUSCK6 BQ25606EVM-772 004

The bq25606 evaluation module (EVM) is a standalone charger module without I2C control.

1.2 I/O Descriptions

Table 2 lists the jumper connections available on this EVM.

Jack Description

J1-VAC Input positive terminal

J1-GND Ground Input: negative terminal (ground terminal)

J2-PMID PMID pin connection

J2-GND Ground

J4-SYS Connected to system

J4-GND Ground

J5-BATSNS_ICHG BATSNS or ICHG pin connection

J5-BAT Connected to battery pack positive node

J5-GND Ground

www.ti.com

Table 1. Device Data Sheets

Table 2. EVM Connections

J3 Output mini-USB port

J6 I2C 4-pin connector J7 USB-TO-GPIO connector (Not populated)

Table 3 lists the EVM jumper connections.

Table 3. EVM Jumper Connections and Shunt Installation

Jack Description bq25606 Setting

JP1 PSEL pin selection Not installed JP2 CE pin setting: pull low to enable the charge Installed JP3 OTG pin setting: pull high to enable OTG mode Short OTG to GND JP4 STAT, PG, CE, INT, and OTG pins pullup source (SYS or

JP5 TS pin to GND Not installed JP6 TS resistor divider pullup source (REGN) connection Installed JP7 Internal 10 kΩ to GND to TS pin Installed JP8 BATSNS selection Not installed

JP9 QON and VSET pin setting Not installed JP10 STAT pin setting Installed JP11 Add SYS cap Not installed JP12 SDA and PG pin setting Installed JP13 D+ and PSEL to J3 Not Installed JP14 D– and PG to J3 Not Installed JP15 D– and PG pin setting Not installed JP16 Add VBUS cap Not installed

bq25606 PWR772 Evaluation Module

BAT)

Short to SYS

SLUUBL3A–June 2017–Revised October 2017

Submit Documentation Feedback

www.ti.com

Table 3. EVM Jumper Connections and Shunt Installation (continued)

Jack Description bq25606 Setting

JP17 Add PMID cap Not installed JP18 Add AT cap Not installed

S1 QON control Default open S2 Switch to short indicator LEDs Default open

Table 4 lists the recommended operating conditions for this EVM.

Symbol Description MIN TYP MAX Unit

Supply voltage, V Battery voltage, V I

BAT

Supply current, I

VBUS

BAT

2 Test Summary

2.1 Equipment

This section includes a list of supplies required for testing this EVM.

1. Power supply: Power supply #1 (PS#1): a power supply capable of supplying 5 V at 3 A is required. While this part can handle larger voltage and current, it is not necessary for this procedure.

2. Load #1:

• (4-quadrant supply, constant voltage < 4.5 V) A 0–20 V, 0–5 A, > 30-W system, DC electronic load

and setting as constant voltage load mode

• Kepco load: BOP 20–5M, DC 0 to ±20 V, 0 to ±5 A (or higher)

3. Load #2: Use with Boost Mode, VAC to GND load, 10 Ω, 5 W or greater.

4. Meters:

• Six Fluke 75 multimeters, (equivalent or better)

• Four equivalent voltage meters and two equivalent current meters. The current meters must be

capable of measuring 5-A+ current

Test Summary

Table 4. Recommended Operating Conditions

Input voltage from AC adapter 3.9 5.0 13.5 V Voltage applied at V Fast charging current 0 3.0 A Discharging current through internal MOSFET 6.0 A Maximum input current from AC adapter input 0 3.0 A

terminal 0 4.208 4.4 V

BAT

2.2 Equipment Setup

Use the following list to set up the equipment:

1. Set PS#1 for 5-V DC, 3-A current limit and then turn off the supply.

2. Connect the output of PS#1 in series with a current meter (multimeter) to J1 (VAC and GND). It is recommended to connect one voltage meter across TP24 and TP27 to measure the input current sensing resistor voltage. The sensing resistor is 10 mΩ.

3. Connect one voltage meter across TP21 (VAC) and TP18 (GND), connect another voltage meter across TP1 (VBUS) and TP18 (GND).

4. Turn on Load #1, set to constant voltage mode and output to 2.5 V. Turn off (disable) load. Connect load to J5 (BAT and GND).

5. Connect one voltage meter across TP9 (BAT) and TP17 (GND) to measure the battery voltage and another voltage meter across TP28 and TP29 to measure the battery current sensing resistor voltage. The sensing resistor is 10 mΩ. An alternate method is to use the optional current meter in series to measure the battery current.

SLUUBL3A–June 2017–Revised October 2017

Submit Documentation Feedback

bq25606 PWR772 Evaluation Module

Test Summary

6. Install shunts as shown in Table 3.

www.ti.com

Figure 1. Original Test Setup for bq25606 EVM

bq25606 PWR772 Evaluation Module

SLUUBL3A–June 2017–Revised October 2017

Submit Documentation Feedback

www.ti.com

2.3 Test Procedure

2.3.1 Charger Mode Verification

1. Enable Load #1 from Section 2.2, Step 4.

2. Measure the voltage across J4 and J5 as follows:

• Measure → V(TP8(SYS), TP17(GND)) = 3.65 V (typical)

• Measure → V(TP9(BAT), TP17(GND)) = 2.5 V (typical)

• Measure → IBAT ( = pre-charge current)

3. Change Load #1 to 3.7 V

• Measure → V(TP8(SYS), TP17(GND)) = 3.8 V (typical)

• Measure → V(TP9(BAT), TP17(GND)) = 3.7 V (typical)

• Measure → IBAT ( = fast charge current)

4. Adjust R10 to change charging current.

5. Adjust R11 to change input current limit.

6. Turn off and disconnect Load #1.

7. Turn off and disconnect PS#1.

2.3.2 Boost Mode Verification

1. Do not install JP3.

2. If the constant voltage load connected from BAT to GND is not a four-quadrant supply (sources current), remove the load and use the power source disconnected in step 1, set to 3.7 V and 2-A current limit and connect between BAT and GND.

3. Apply 10 Ω (5 W or greater) across J1 VAC(+) to GND(–).

4. Verify V Measure → V

5. Turn off and disconnect power supply.

6. Remove 10-Ω resistor at VAC.

to GND since VBUS is the actual boost mode output voltage.

VBUS

= 5.15 V (Typical)

VBUS

Test Summary

2.3.3 Helpful Tips

• The leads and cables to the various power supplies, batteries, and loads have resistance. The current meters also have series resistance. The charger dynamically reduces charge current depending on the voltage sensed at its VBUS pin (using the VINDPM feature), BAT pin (as part of normal termination), and TS pin (through its battery temperature monitoring feature via battery thermistor). Therefore, voltmeters must be used to measure the voltage as close to the IC pins as possible instead of relying on the digital readouts of the power supply. If a battery thermistor is not available, make sure shunts JP6 and JP7 are in place.

• When using a source meter that can source and sink current as your battery simulator, TI highly recommends adding a large (1000+ μF) capacitor at the EVM BAT and GND connectors in order to prevent oscillations at the BAT pin due to mismatched impedances of the charger output and source meter input within their respective regulation loop bandwidths. Configuring the source meter for 4-wire sensing eliminates the need for a separate voltmeter to measure the voltage at the BAT pin. When using 4-wire sensing, always ensure that the sensing leads are connected in order to prevent accidental overvoltage by the power leads.

• For precise measurements of charge current and battery regulation near termination, the current meter in series with the battery or battery simulator should not be set to auto-range and may need be removed entirely. An alternate method for measuring charge current is to either use an oscilloscope with Hall effect current probe or place a 1% or better, thermally capable (for example, 0.010 Ω in 1210 or larger footprint) resistor in series between the BAT pin and battery and measure the voltage across that resistor. The bq25606EVM has the sensing resistors onboard.

SLUUBL3A–June 2017–Revised October 2017

Submit Documentation Feedback

bq25606 PWR772 Evaluation Module

+ 9 hidden pages

Texas Instruments bq25606, PWR772 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual