Texas Instruments bq25505 User's Manual
Download Operation & user’s manual of Texas Instruments bq25505 Battery Charger for Free or View it Online on All-Guides.com.
Brand: Texas Instruments
Category: Battery Charger
Type: Operation & user’s manual for Texas Instruments bq25505
Pages: 23 (0.72 Mb)
Download Texas Instruments bq25505 Operation & user’s manual
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
User's Guide
SLUUAA8–September 2013
User's Guide for bq25505 Battery Charger Evaluation
Module for Energy Harvesting
This user’s guide describes the bq25505 evaluation module (EVM), how to perform a stand-alone
evaluation and how to allow the EVM to interface with the system and host. The boost charger output is
configured to deliver up to 4.2-V maximum voltage to its output, VSTOR, using external resistors. This
voltage is applied to the storage element as long as the storage element voltage at VBAT_SEC is above
the internally programmed undervoltage of 2 V. The VBAT_OK indicator toggles high when VSTOR ramps
up to 3 V and toggles low when VSTOR ramps down to 2.8 V.
Contents
1 Introduction ................................................................................................................... 2
1.1 EVM Features ....................................................................................................... 2
1.2 General Description ................................................................................................ 2
1.3 Design and Evaluation Considerations .......................................................................... 3
1.4 bq25505EVM Schematic........................................................................................... 4
1.5 EVM I/O Connections .............................................................................................. 5
2 EVM Performance Specification Summary............................................................................... 7
3 Test and Measurement Summary ......................................................................................... 7
3.1 Test Setups and Results........................................................................................... 8
4 Bill of Materials and Board Layout ....................................................................................... 14
4.1 Bill of Materials .................................................................................................... 14
4.2 EVM Board Layout ................................................................................................ 15
5 PCB Layout Guideline ..................................................................................................... 19
List of Figures
1 bq25505EVM Schematic.................................................................................................... 4
2 Test Setup for Measuring Boost Charger Efficiency .................................................................... 8
3 Charger Efficiency versus Input Voltage.................................................................................. 9
4 Charger Efficiency versus Input Current.................................................................................. 9
5 Test Setup for Measuring Charger Operation .......................................................................... 10
6 Charger Operational Waveforms During Battery Charging ........................................................... 10
7 Test Setup................................................................................................................... 11
8 Switching from Primary to Secondary Battery.......................................................................... 12
9 Test Setup for Charging a Super Capacitor on VBAT_SEC.......................................................... 12
10 Charging a Super Cap on VBAT_SEC ................................................................................. 13
11 EVM PCB Top Silk ......................................................................................................... 15
12 EVM PCB Top Assembly.................................................................................................. 16
13 EVM PCB Top Layer ...................................................................................................... 17
14 EVM PCB Bottom Layer................................................................................................... 18
List of Tables
1 I/O Connections and Configuration for Evaluation of bq25505 EVM ................................................. 5
2 Bill of Materials ............................................................................................................. 14
1
SLUUAA8–September 2013 User's Guide for bq25505 Battery Charger Evaluation Module for Energy
Harvesting
Submit Documentation Feedback
Copyright © 2013, Texas Instruments Incorporated