Texas Instruments bq24720 EVM User Manual
  1. Manuals
  2. Brands
  3. Texas Instruments Manuals
  4. Motherboard
  5. bq24720 EVM
  6. User manual
Texas Instruments bq24720 EVM User Manual

Texas Instruments bq24720 EVM User Manual

For multi-cell synchronous switch-mode charger with system power selector and smbus sbs-like interface
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
bq24720/21 EVM (HPA104) for Multi-Cell Synchronous
Switch-Mode Charger With System Power Selector and
1
2
3
Circuit Design and Layout Guideline
4
Bill of Materials, Board Layout, and Schematics
1
Connections of the EV2300 Kit
2
3
4
5
6
7
8
9
10
11
12
13
14
The Software Main Window
15
The Waveforms at I
16
17
18
19
20
21
22
23
24
SLUU237 - January 2006
..........................................................................................
......................................................................................
List of Figures
...................................................................
.......................................................................
.....................................................................
.....................................................................
.....................................................................
....................................................................
....................................................................
.....................................................................
....................................................................
.....................................................................
.....................................................................
...............................................................
(bat)
.....................................................................
.....................................................................
.....................................................................................
..................................................................................
..............................................................................................
..............................................................................................
..............................................................................................
..............................................................................................
.............................................................................................
Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface
SMBus SBS-Like Interface
Contents
...........................................................
..............................................
...........................................................
...........................................................
................................
bq24720/21 EVM (HPA104) for Multi-Cell Synchronous
User's Guide
SLUU237 - January 2006
2
4
21
22
5
6
7
8
9
10
11
12
13
13
14
15
16
17
18
19
20
24
25
26
27
28
29
30
1

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the bq24720 EVM and is the answer not in the manual?

Questions and answers

Related Manuals for Texas Instruments bq24720 EVM

Summary of Contents for Texas Instruments bq24720 EVM

  • Page 1: Table Of Contents

    Bill of Materials, Board Layout, and Schematics List of Figures ..............Connections of the EV2300 Kit ............Original Test Setup for bq24720 EVM ............Original Test Setup for bq24721 EVM ........ The Main Window of the bq2472x SMB Evaluation Software ...............

  • Page 2: Introduction

    www.ti.com Introduction Introduction EVM Features • Evaluation Module For Both bq24720 and bq24721 • High Efficiency NMOS-NMOS Synchronous Buck Charger With User-Selectable 300 kHz or 500 kHz Frequency • Battery/Adapter to System Power Selector Function • SBS-Like SMBus Interface for Control and Status Communications With Host •...
  • Page 3 www.ti.com Introduction Jack Description J5–REF IC reference voltage VREF5 (pin 11) J5–VPUP Pull-up voltage source J5–EXT External power supply J6–CHGEN CHGEN pin (1) output J6–GND Ground J7–VPUP Pull-up voltage source J7–LEDPWR LED Pull-up power line J8–ACGD/TS ACGOOD pin (15) output for bq24720, TS pin (15) output for bq24721 J8–GND Ground J8–VBAT...

  • Page 4: Test Summary

    www.ti.com Test Summary Test Summary Definitions This procedure details the configure of the HPA104 evaluation board. On the test procedure, the following naming conventions are followed. See the HPA104 schematic for details. VXXX : External voltage supply name (VADP, VBT, VSBT) LOADW: External load name (LOADR, LOADI) V(TPyyy):...
  • Page 5 www.ti.com Test Summary 2.2.6 COMPUTER • A computer with at least one USB port and a USB cable. The EV2300 USB driver and the bq2472x SMB evaluation software must be properly installed. 2.2.7 EV2300 SMBUS COMMUNICATION KIT • An EV2300 SMBUS communication kit. 2.2.8 SOFTWARE •...

  • Page 6: Original Test Setup For Bq24720 Evm

    17. (For bq24721 only) Connect the output of the power supply number 3 to J8 (ACGD, GND). After the steps above, the test setup for bq24720 EVM is shown in Figure 2. The test setup for bq24721...

  • Page 7: Original Test Setup For Bq24721 Evm

    www.ti.com Test Summary Oscilloscope Oscilloscope BQ24721 EVM BQ24721 EVM Power Power supply #3 supply #3 ACGD ACGD VBAT VBAT VSYS VSYS Power Power APPLICATION CIRCUIT APPLICATION CIRCUIT supply #1 supply #1 ALARM ALARM IOUT IOUT D8 D10 D11 D7 D9 D8 D10 D11 D7 D9 EV2300 EV2300...

  • Page 8: The Main Window Of The Bq2472X Smb Evaluation Software

    www.ti.com Test Summary Figure 4. The Main Window of the bq2472x SMB Evaluation Software Procedure 2.4.1 AC Adapter Detection Threshold Make sure EQUIPMENT SETUP steps are followed. Turn on PS2 (For bq24721 only) Turn on PS3 Turn on PS1 Measure→ V(J8(VSYS)) = 0 V ± 500 mV Measure→...

  • Page 9: The Software Main Window

    www.ti.com Test Summary 2.4.2 Charge Parameters Setting Increase the voltage of PS1 until V(J1(POS)) = 19 V ± 0.1 V. Measure→ V(J8(VBAT, GND)) = 0 V ± 1 V In the software main window, click Read All on the top part of the window. The window is shown in Figure Figure 5.

  • Page 10: The Software Main Window

    www.ti.com Test Summary Figure 6. The Software Main Window Install J6. Observe→ D7 (CHG EN) ON. Change the B0 bit (CHGEND) of Control Register to 0. (Enable the charging). Click Write. Measure→ V(J8(VBAT)) = 12.6 V ± 200 mV Observe→ D9 (ALARM) ON. In the software main window, click Read All on the top part of the window.

  • Page 11: The Software Main Window

    www.ti.com Test Summary Figure 7. The Software Main Window Observe → Make sure the phase node voltage (PH) and the inductor current waveforms look like Figure SLUU237 – January 2006 bq24720/21 EVM (HPA104) for Multi-Cell Synchronous Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface...

  • Page 12: The Waveforms At No Load

    www.ti.com Test Summary Figure 8. The Waveforms at No Load 2.4.3 Charge Current and AC Current Regulation (DPM) Change the B0 bit (CHGEND) of Control Register to 0. (Enable the charging). Click Write. Connect the output of the Kepco load in series with a current meter (multimeter) to J8 (VBAT, GND). Make sure a voltage meter is connected across J8 (VBAT, GND).

  • Page 13: Test Setup For Bq24720 Evm

    D8 D10 D11 D7 D9 D8 D10 D11 D7 D9 EV2300 EV2300 CHGEN CHGEN Power Power supply #2 supply #2 Figure 9. Test Setup for bq24720 EVM Oscilloscope Oscilloscope BQ24721 EVM BQ24721 EVM Power Power supply #3 supply #3 Electr.

  • Page 14: The Software Main Window

    www.ti.com Test Summary Change the B0 bit (CHGEND) of Control Register to 0. (Enable the charging). Click Write. = 1000 mA ± 200 mA Measure→ I (bat) Type in 3000 (mA) in the Charge Current Register and click Write. = 3000 mA ± 200 mA Measure→...

  • Page 15: The Waveforms At I

    www.ti.com Test Summary Figure 12. The Waveforms at I = 3 A (bat) Enable the output of the electronic load. = 2500 mA ± 200 mA, I = 3000 mA ± 200 mA, I = 4300 mA ± 300 mA Measure→...

  • Page 16: The Software Main Window

    www.ti.com Test Summary Figure 13. The Software Main Window Turn off the electronic load. = 0 ± 100 mA, I = 3000 mA ± 200 mA. Measure→ I (sys) (bat) 2.4.4 Charger Cut-Off by Thermistor (bq24721 ONLY) = 0 A ± 10 mA. Slowly increase the output voltage of PS3 until I (bat) Measure→...

  • Page 17: The Software Main Window

    www.ti.com Test Summary Figure 14. The Software Main Window 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 Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface...
  • Page 18 www.ti.com Test Summary Figure 15. The Waveforms at I = 300 mA (bat) 2.4.6 Learn Cycle Measure→ V(J8(VSYS)) = 19 V ± 1 V (adapter connected to system) Observe→ D10 (ACSW ON) ON, D11 (BATDRV ON) OFF. Change the B0 bit (CHGEND) of the Control Register to 1 (disable the charging). Click Write. Change the B4 bit (LEARN) of the Control Register to 1.

  • Page 19: The Software Main Window

    www.ti.com Test Summary Figure 16. The Software Main Window 2.4.7 Power Path Selection Change the B4 bit (LEARN) of the Control Register to 0. (no learn). Click Write. Measure→ V(J8(VSYS)) = 19 V ± 1 V (adapter connected to system) Observe→...
  • Page 20 www.ti.com Test Summary Figure 17. The Software Main Window bq24720/21 EVM (HPA104) for Multi-Cell Synchronous SLUU237 – January 2006 Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface...
  • Page 21 www.ti.com Circuit Design and Layout Guideline Circuit Design and Layout Guideline Optional Components The bq24720/21 EVM has all components required for robust operation on a wide range of different operating conditions and ac adapter/load transients. However, some of its components might not be required, or can be of distinct value, depending on the application condition.
  • Page 22 www.ti.com Bill of Materials, Board Layout, and Schematics Bill of Materials, Board Layout, and Schematics Bill of Materials bq24720 bq24721 Ref Des Value Description Size Part Number -001 -002 C1, C3, C5, C6, C7, C15, C20, 0.1 µF C21, C25, C26, Capacitor, Ceramic, 0.1-µF, 50-V, X7R, 10% 0805 C0805C104K5RACTU...
  • Page 23 www.ti.com Bill of Materials, Board Layout, and Schematics bq24720 bq24721 Ref Des Value Description Size Part Number -001 -002 R27, R30 Resistor, Chip, 20 kΩ, 1/10-W, 5% 0805 R28, R29, R31, 2.2k Resistor, Chip, 1/10W, 5% 0805 R34, R39, R65 Resistor, Chip, 1/16W, 5% 0402 R4, R6, R9...

  • Page 24: Top Assembly

    www.ti.com Bill of Materials, Board Layout, and Schematics Board Layout Figure 18. Top Assembly bq24720/21 EVM (HPA104) for Multi-Cell Synchronous SLUU237 – January 2006 Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface...

  • Page 25: Bottom Assembly

    www.ti.com Bill of Materials, Board Layout, and Schematics Figure 19. Bottom Assembly SLUU237 – January 2006 bq24720/21 EVM (HPA104) for Multi-Cell Synchronous Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface...

  • Page 26: Layer

    www.ti.com Bill of Materials, Board Layout, and Schematics Figure 20. Layer 1 bq24720/21 EVM (HPA104) for Multi-Cell Synchronous SLUU237 – January 2006 Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface...

  • Page 27: Layer

    www.ti.com Bill of Materials, Board Layout, and Schematics Figure 21. Layer 2 SLUU237 – January 2006 bq24720/21 EVM (HPA104) for Multi-Cell Synchronous Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface...

  • Page 28: Layer

    www.ti.com Bill of Materials, Board Layout, and Schematics Figure 22. Layer 3 bq24720/21 EVM (HPA104) for Multi-Cell Synchronous SLUU237 – January 2006 Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface...

  • Page 29: Layer

    www.ti.com Bill of Materials, Board Layout, and Schematics Figure 23. Layer 4 SLUU237 – January 2006 bq24720/21 EVM (HPA104) for Multi-Cell Synchronous Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface...

  • Page 30: Top Silk

    www.ti.com Bill of Materials, Board Layout, and Schematics Figure 24. Top Silk Schematics The schematic is shown on the following pages. bq24720/21 EVM (HPA104) for Multi-Cell Synchronous SLUU237 – January 2006 Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface...

  • Page 33: Sluu237 – January 2006 Bq24720/21 Evm (Hpa104) For Multi-Cell Synchronous

    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.
  • Page 34 TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions:...

This manual is also suitable for:

Bq24721 evm

Table of Contents