Texas Instruments bq24720 EVM User Manual Download Page 33

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Bill of Materials, Board Layout, and Schematics

EVM TERMS AND CONDITIONS

Texas Instruments (TI) provides the enclosed Evaluation Module and related material (EVM) to you, the user, (you or user)
SUBJECT TO the terms and conditions set forth below. By accepting and using the EVM, you are indicating that you have read,
understand and agree to be bound by these terms and conditions. IF YOU DO NOT AGREE TO BE BOUND BY THESE TERMS
AND CONDITIONS, YOU MUST RETURN THE EVM AND NOT USE IT.

This EVM is provided to you by TI and is intended for your INTERNAL ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY
. It is provided “AS IS” and “WITH ALL FAULTS.” It is not considered by TI to be fit for commercial use. As
such, the EVM may be incomplete in terms of required design-, marketing-, and/or manufacturing-related protective considerations,
including product safety measures typically found in the end product. As a prototype, the EVM does not fall within the scope of the
European Union directive on electromagnetic compatibility and therefore may not meet the technical requirements of the directive.

Should this EVM not meet the specifications indicated in the EVM User’s Guide, it may be returned within 30 days from the date of
delivery for a full refund of any amount paid by user for the EVM, which user agrees shall be user’s sole and exclusive remedy.
THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY TI TO USER, AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS
FOR ANY PARTICULAR PURPOSE OR NON-INFRINGEMENT.

TI shall have no obligation to defend any claim arising from the EVM, including but not limited to claims that the EVM infringes third
party intellectual property. Further, TI shall have no liability to user for any costs, losses or damages resulting from any such
claims. User shall indemnify and hold TI harmless against any damages, liabilities or costs resulting from any claim, suit or
proceeding arising from user’s handling or use of the EVM, including but not limited to, (i) claims that the EVM infringes a third
party’s intellectual property, and (ii) claims arising from the user’s use or handling of the EVM. TI shall have no responsibility to
defend any such claim, suit or proceeding.

User assumes all responsibility and liability for proper and safe handling and use of the EVM and the evaluation of the EVM. TI
shall have no liability for any costs, losses or damages resulting from the use or handling of the EVM. User acknowledges that the
EVM may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction of the EVM it is the
user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge.

EXCEPT TO THE EXTENT OF THE USER’S INDEMNITY OBLIGATIONS SET FORTH ABOVE, NEITHER PARTY SHALL BE
LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES WHETHER TI IS
NOTIFIED OF THE POSSIBILITY OR NOT.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or infringement of
patents or services described herein.

User agrees to read the EVM User’s Guide and, specifically, the EVM warnings and Restrictions notice in the EVM User’s Guide
prior to handling the EVM and the product. This notice contains important safety information about temperatures and voltages.

It is user’s responsibility to ensure that persons handling the EVM and the product have electronics training and observe good
laboratory practice standards.

By providing user with this EVM, product and services, TI is NOT granting user any license in any patent or other intellectual
property right.

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

Copyright © 2006, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 0 V to 24 V and the output voltage range of 0 V to 20 V.

Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
questions concerning the input range, please contact a TI field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the
EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load
specification, please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than 50°C. The EVM is designed to
operate properly with certain components above 50°C as long as the input and output ranges are maintained. These components
include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of
devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near
these devices during operation, please be aware that these devices may be very warm to the touch.

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

Copyright © 2006, Texas Instruments Incorporated

SLUU237 – January 2006

bq24720/21 EVM (HPA104) for Multi-Cell Synchronous

31

Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface

Summary of Contents for bq24720 EVM

Page 1: ...tware 8 5 The Software Main Window 9 6 The Software Main Window 10 7 The Software Main Window 11 8 The Waveforms at No Load 12 9 Test Setup for bq24720 EVM 13 10 Test Setup for bq24721 EVM 13 11 The S...

Page 2: ...urrent to Li Ion or Li Pol applications The bq24720 21 has a highly integrated battery charge controller designed to work with external host commands The battery voltage charge current and other syste...

Page 3: ...1 and 2 J5 1 2 Use external power supply as the pull up source are short circuited 2 3 Use REF5 as the pull up source J6 Enable charge process when ON Off The pull up power source supplies the LEDs w...

Page 4: ...ied parameters A B If measured values are not within specified limits the unit under test has failed Observe A B Observe if A B occurs If they do not occur the unit under test has failed The assembly...

Page 5: ...he supply 2 Connect the output of power supply number 1 in series with a current meter multimeter to J1 POS GND 3 Connect a voltage meter across J1 POS GND 4 Set the power supply number 2 for 3 3 V 10...

Page 6: ...CIRCUIT V USB V EV2300 Iin I Power supply 1 BQ24720 EVM Oscilloscope L1 PH Test Summary 16 For bq24721 only Set the power supply number 3 for 2 5 V 100 mVDC 1 A 0 1 A current limit and then turn off t...

Page 7: ...7 J7 J7 Power supply 2 ACGD J4 GND ALARM CHGEN SDA SCL POS J6 J6 J6 J5 D8 D10 D11 D7 D9 D18 J12 APPLICATION CIRCUIT V USB V EV2300 Iin I Power supply 1 BQ24721 EVM Oscilloscope L1 PH V Power supply 3...

Page 8: ...he output voltage of PS1 until the D8 BYPASS is on The threshold is approximately 13 V Do not exceed Measure V TP ACDET 1 2 V 0 1 V Measure V J1 POS 13 V 1 V Measure V J8 VSYS 13 V 1 V Measure V TP VR...

Page 9: ...indow and click Write This sets the battery voltage regulation threshold Type 1000 mA in the Charge Current Register on the lower right part of the window and click Write This sets the battery charge...

Page 10: ...2 6 V 200 mV Observe D9 ALARM ON In the software main window click Read All on the top part of the window Observe D9 ALARM off Observe The B2 bit NoVreg of the Status Register turns green voltage loop...

Page 11: ...indow Observe Make sure the phase node voltage PH and the inductor current waveforms look like Figure 8 SLUU237 January 2006 bq24720 21 EVM HPA104 for Multi Cell Synchronous 11 Switch Mode Charger Wit...

Page 12: ...n on the Kepco load Connect the output of the electronic load in series with a current meter multimeter to J8 VSYS GND Make sure a voltage meter is connected across J8 VSYS GND Turn on the power of th...

Page 13: ...ND VSYS J8 GND VBAT IOUT GND REF J3 J2 J11 J10 J9 J7 Power supply 2 ACGD J4 GND ALARM CHGEN SDA SCL POS J6 J5 D8 D10 D11 D7 D9 APPLICATION CIRCUIT Isys V I USB V EV2300 Electr Load Kepco Load Iin I Po...

Page 14: ...ent output If not change it to 1 Click Write Measure V J4 IOUT 600 mV 30 mV Click Read All Observe The B3 bit NoIreg of the Status Register turns green charge current loop active The window should be...

Page 15: ...nic load Measure I sys 2500 mA 200 mA I bat 500 mA 300 mA II 3000 mA 400 mA Measure V J4 IOUT 100 mV 80 mV Change the B3 bit IOUTBT of the Control Register to 0 adapter current output Click Write Meas...

Page 16: ...sure V J8 ACGD 1 465 V 300 mV Slowly increase the output voltage of PS3 to 2 5 V 100 mV Measure I bat 3000 mA 200 mA 2 4 5 Voltage Regulation and NonSynchronous Operation at Light Load Slowly increase...

Page 17: ...ndow Observe The inductor current waveform is like Figure 15 The inductor current does not drop below 0 A SLUU237 January 2006 bq24720 21 EVM HPA104 for Multi Cell Synchronous 17 Switch Mode Charger W...

Page 18: ...r to 1 disable the charging Click Write Change the B4 bit LEARN of the Control Register to 1 learn cycle Click Write Measure V J8 VSYS 12 3 V 300 mV battery connected to system Observe D10 ACSW ON off...

Page 19: ...10 ACSW ON ON D11 BATDRV ON OFF Turn off PS1 Measure V J8 VSYS 12 3 V 300 mV battery connected to system Observe D10 ACSW ON OFF D11 BATDRV ON ON D8 BYPASS ON OFF Observe The B1 bit CHGOFF of the Stat...

Page 20: ...ti com Test Summary Figure 17 The Software Main Window bq24720 21 EVM HPA104 for Multi Cell Synchronous 20 SLUU237 January 2006 Switch Mode Charger With System Power Selector and SMBus SBS Like Interf...

Page 21: ...gh side gate resistor R17 must be lower than 5 to assure the break before make 1 The control stage and the power stage are layed out separately At each layer the signal ground and the power ground are...

Page 22: ...ND Liteon 1 1 J1 Terminal Block 2 pin 15 A 5 1 mm 0 40 0 35 ED1609 OST 1 1 J2 Terminal Block 2 pin 6 A 3 5 mm 75525 ED1514 OST 1 1 J3 Terminal Block 4 pin 6 A 3 5 mm 0 55 0 25 ED1516 OST 1 1 J4 Termin...

Page 23: ...X 6 32 NYL 0 500 sf_thvt_325_rnd 4816 Keystone ST4 TP1 TP2 TP3 TP4 TP5 TP6 TP13 TP14 TP19 TP22 18 18 5002 Test Point White Thru Hole Color Keyed 0 100 0 100 5002 Keystone TP24 TP26 TP27 TP29 TP31 TP32...

Page 24: ...yout Bill of Materials Board Layout and Schematics Figure 18 Top Assembly 24 bq24720 21 EVM HPA104 for Multi Cell Synchronous SLUU237 January 2006 Switch Mode Charger With System Power Selector and SM...

Page 25: ...of Materials Board Layout and Schematics Figure 19 Bottom Assembly SLUU237 January 2006 bq24720 21 EVM HPA104 for Multi Cell Synchronous 25 Switch Mode Charger With System Power Selector and SMBus SBS...

Page 26: ...ill of Materials Board Layout and Schematics Figure 20 Layer 1 26 bq24720 21 EVM HPA104 for Multi Cell Synchronous SLUU237 January 2006 Switch Mode Charger With System Power Selector and SMBus SBS Lik...

Page 27: ...ill of Materials Board Layout and Schematics Figure 21 Layer 2 SLUU237 January 2006 bq24720 21 EVM HPA104 for Multi Cell Synchronous 27 Switch Mode Charger With System Power Selector and SMBus SBS Lik...

Page 28: ...ill of Materials Board Layout and Schematics Figure 22 Layer 3 28 bq24720 21 EVM HPA104 for Multi Cell Synchronous SLUU237 January 2006 Switch Mode Charger With System Power Selector and SMBus SBS Lik...

Page 29: ...ill of Materials Board Layout and Schematics Figure 23 Layer 4 SLUU237 January 2006 bq24720 21 EVM HPA104 for Multi Cell Synchronous 29 Switch Mode Charger With System Power Selector and SMBus SBS Lik...

Page 30: ...Board Layout and Schematics Figure 24 Top Silk The schematic is shown on the following pages 30 bq24720 21 EVM HPA104 for Multi Cell Synchronous SLUU237 January 2006 Switch Mode Charger With System P...

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Page 33: ...the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge EXCEPT TO THE EXTENT OF THE USER S INDEMNITY OBLIGATIONS SET FORTH ABOVE NEITHER PARTY SHAL...

Page 34: ...ute a license from TI to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual pro...

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