数据搜索系统,热门电子元器件搜索 |
|
ACT2861QI 数据表(PDF) 35 Page - Active-Semi, Inc |
|
ACT2861QI 数据表(HTML) 35 Page - Active-Semi, Inc |
35 / 91 page ACT2861QI Rev 2.0, 27-Apr-2018 Innovative PowerTM www.active-semi.com ActiveSwitcherTM is a trademark of Active-Semi Copyright © 2018 Active-Semi, Inc. 35 Battery Charging Profile The IC follows the standard Li-Ion battery charge profile with four charging phases: dead battery, precondition- ing, constant current, and constant voltage. The battery charge current is a function the battery voltage and the IC’s hardware and register settings. Table 3 shows these settings. Table 3: Charging Current Setting VBAT Charging Current Current set by < VBATDEAD IDBATTERY Fixed at 10mA VBATDEAD ~ VBATSHORT ISHORT I2C Configurable: 1%, 2%, 4%, 8% of IOLIM current VBATSHORT ~ VBATLOW IPRECHG I2C Configurable: 5% to 20% of IOLIM current > VBATLOW ICHG I2C and Hardware Configurable > VTERM 0A None Voltage VBATLOW Battery Voltage Charge Current Trickle Charge Pre- Charge Fast Charge and Voltage Regulation IPRECHARGE ITERM ISHRT Dead Battery VDBATTERY VTERM IDBATTERY IFASTCHARGE Regulate VTERM after charge complete Current Figure 10: Battery Charging Profile Setting Charge Current The battery charging current, ICHG, is set by a combina- tion of a current sense resistor, an OLIM resistor, and a scaling factor defined by I2C bits IFCHG[6:0] in register 0x18h. The maximum allowable charge current is 5A. Figure 11 shows the hardware circuitry that sets IOLIM. IOLIM is the maximum charge current set by hardware. The actual battery charge current, ICHG, can be scaled from 1% to 100% of IOLIM in 1% steps. The following equation defines the final charge current. I I ∗IFCHG 6: 0 Where IOLIM is the hardware programmed charging cur- rent and IFCHG[6:0] is the scaling factor. IFCHG[6:0] is the decimal equivalent value in this register. For exam- ple, if IOLIM, is programmed to 4A and IFCHG[6:0] = 1001011b (75% decimal), the final charge current = 4A * 0.75 = 3A. Note that IFCHG[6:0] is a 7 bit register and can be pro- grammed between 0x00h and 0x7Fh (0% and 127%). If a value of 0x00h is written to the register, the register retains 0x00h, but the IC sets the charge current to 1%. If a value above 0x64h (100%) is written to the register, the IC retains the written value, but sets the charge cur- rent to 100%. To Battery RCS_OUT ROLIM ROSRN ROSRP COSR OSRN OSRP VBAT OLIM RCS_COMP CCS_COMP Figure 11: Charge Current Circuitry The current sense resistor and OLIM resistor set the IOLIM current. 1000 ∗ _ Where ROLIM is the resistor from the OLIM pin to AGND in ohms and RCS_OUT is the current sense resistor value in ohms. The term 1000V^2/A is a constant with the units volts^2/Ampere. The current sense resistor, RCS_OUT, value should be chosen to give a maximum current sense voltage be- tween 20mV and 50mV. 50mV is the absolute maximum allowable voltage. Using lower voltages reduces the re- sistor’s power dissipation, but decreases accuracy. At lower charging currents, additional RC compensation must be placed in parallel with ROLIM. Table 4 gives rec- ommended resistor values for different values of IOLIM current. Contact sales@active-semi.com for compensa- tion information if other configurations are required. |
类似零件编号 - ACT2861QI |
|
类似说明 - ACT2861QI |
|
|
链接网址 |
隐私政策 |
ALLDATASHEETCN.COM |
ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |