bq24075 锂电池 充电电路分析-阿里云开发者社区

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bq24075 锂电池 充电电路分析

简介:      bq24075 锂电池 充电电路分析   本文主要是分析bq24075锂电池充电芯片电路,知道其大致是怎么工作的,其中的一些电阻该如何配置。                             2016-1-22 深圳 南山平山村 曾剑锋 一、参考文章: 1.

     bq24075 锂电池 充电电路分析

  本文主要是分析bq24075锂电池充电芯片电路,知道其大致是怎么工作的,其中的一些电阻该如何配置。

                            2016-1-22 深圳 南山平山村 曾剑锋

一、参考文章:

    1. NTC热敏电阻器
    http://baike.baidu.com/link?url=gD9Ikiv4C21Nhx2WlJwX5_b5vPeMztc4SwwsY5R0Bw-9sHrQFx8CZJBuU9EgMNABz4zgLEKF_j-bsP1qu2QcBa
  2. 103AT-2
    http://www.mouser.cn/ProductDetail/Semitec/103AT-2/?qs=wgO0AD0o1vvcDzsKguD%252bew%3D%3D
  3. bq24075输出问题
    http://www.deyisupport.com/question_answer/analog/battery_management/f/35/t/77294.aspx
  4. bq24075
    http://wenku.baidu.com/link?url=rq7MvZFy49pOHZnRpCO43PXGmLM46ty99skxKXxDalLsVq9zZj92SAGzoPTs28T8ZRRgHDXKYBCVb27oFB5eqncJWAyo7sdFK0_wjDGamV3

二、电路典型接法:

    

三、引脚功能说明:

    

    

四、芯片内部结构:

    

 

五、实际原理图:

    

  1. Program the Input Current Limit (ILIM)
    RILIM = KILIM / II_MAX
    KILIM = 1550from the electrical characteristics table.
    RISET = 1550AΩ / 1.3A = 1.192 kΩ
    Select the closest standard value, which for this case is 1.18 kΩ. Connect this resistor between ILIM (pin 12) and VSS.
  2. Program 6.25-hour Fast-Charge Safety Timer (TMR)
    RTMR = tMAXCHG / (10 × KTMR)
    KTMR = 48 s/kΩ from the electrical characteristics table.
    RTMR = (6.25 hr × 3600 s/hr) / (10 × 45 s/kΩ) = 46.8kΩ
    Select the closest standard value, which for this case is 46.4 kΩ. Connect this resistor between TMR (pin 2) and VSS.
  3. TS Function
    Use a 10kΩ NTC thermistor in the battery pack (103AT-2). For applications that do not require the TS monitoring function, connect a 10kΩ resistor from TS to VSS to set the TS voltage at a valid level and maintain charging.
    103AT-2热敏电阻图:

    

  4. CHG and PGOOD
    LED Status: connect a 1.5kΩ resistor in series with a LED between OUT and CHG to indicate charging status. Connect a 1.5kΩ resistor in series with a LED between OUT and PGOOD to indicate when a valid input source isconnected.
    Processor Monitoring Status: connect a pullup resistor (on the order of 100 kΩ) between the processor’s power rail and CHG and PGOOD
  5. System ON/OFF (SYSOFF) (bq24075 or bq24079 only)
    Connect SYSOFF high to disconnect the battery from the system load. Connect SYSOFF low for normal operation

 

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