ZHCSUA7 December   2023 MCT8314Z

ADVANCE INFORMATION  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 器件比较表
  6. 5 引脚配置和功能
  7. 6 规格
    1. 6.1 绝对最大额定值
    2. 6.2 ESD 等级
    3. 6.3 建议运行条件
    4. 6.4 热性能信息
    5. 6.5 电气特性
    6. 6.6 SPI 时序要求
    7. 6.7 SPI 次级器件模式时序
  8. 7 详细说明
    1. 7.1 概述
    2. 7.2 功能方框图
    3. 7.3 特性说明
      1. 7.3.1  输出级
      2. 7.3.2  PWM 控制模式（1x PWM 模式）
        1. 7.3.2.1 模拟霍尔输入配置
        2. 7.3.2.2 数字霍尔输入配置
        3. 7.3.2.3 异步调制
        4. 7.3.2.4 同步调制
        5. 7.3.2.5 电机运行
      3. 7.3.3  器件接口模式
        1. 7.3.3.1 串行外设接口 (SPI)
        2. 7.3.3.2 硬件接口
      4. 7.3.4  AVDD 线性稳压器
      5. 7.3.5  电荷泵
      6. 7.3.6  压摆率
      7. 7.3.7  跨导（死区时间）
      8. 7.3.8  传播延迟
      9. 7.3.9  引脚图
        1. 7.3.9.1 逻辑电平输入引脚（内部下拉）
        2. 7.3.9.2 逻辑电平输入引脚（内部上拉）
        3. 7.3.9.3 开漏引脚
        4. 7.3.9.4 推挽引脚
        5. 7.3.9.5 七电平输入引脚
      10. 7.3.10 自动同步整流模式（ASR 模式）
      11. 7.3.11 逐周期电流限制
        1. 7.3.11.1 具有 100% 占空比输入的逐周期电流限制
      12. 7.3.12 霍尔比较器（模拟霍尔输入）
      13. 7.3.13 超前角
      14. 7.3.14 FG 信号
      15. 7.3.15 保护功能
        1. 7.3.15.1 VM 电源欠压锁定 (NPOR)
        2. 7.3.15.2 AVDD 欠压锁定 (AVDD_UV)
        3. 7.3.15.3 VCP 电荷泵欠压锁定 (CPUV)
        4. 7.3.15.4 过压保护 (OVP)
        5. 7.3.15.5 过流保护 (OCP)
          1. 7.3.15.5.1 OCP 锁存关断（OCP_MODE = 00b 或 MCT8314ZH）
          2. 7.3.15.5.2 OCP 自动重试 (OCP_MODE = 01b)
          3. 7.3.15.5.3 OCP 仅报告 (OCP_MODE = 10b)
          4. 7.3.15.5.4 OCP 已禁用 (OCP_MODE = 11b)
        6. 7.3.15.6 电机锁定 (MTR_LOCK)
          1. 7.3.15.6.1 MTR_LOCK 锁存关断 (MTR_LOCK_MODE = 00b)
          2. 7.3.15.6.2 MTR_LOCK 自动重试（MTR_LOCK_MODE = 01b 或 MCT8314ZH）
          3. 7.3.15.6.3 MTR_LOCK 仅报告 (MTR_LOCK_MODE= 10b)
          4. 7.3.15.6.4 MTR_LOCK 已禁用 (MTR_LOCK_MODE = 11b)
        7. 7.3.15.7 热警告 (OTW)
        8. 7.3.15.8 热关断 (OTS)
    4. 7.4 器件功能模式
      1. 7.4.1 功能模式
        1. 7.4.1.1 睡眠模式
        2. 7.4.1.2 工作模式
        3. 7.4.1.3 故障复位（CLR_FLT 或 nSLEEP 复位脉冲）
    5. 7.5 SPI 通信
      1. 7.5.1 编程
        1. 7.5.1.1 SPI 格式
    6. 7.6 寄存器映射
      1. 7.6.1 状态寄存器
      2. 7.6.2 控制寄存器
  9. 8 应用和实施
    1. 8.1 应用信息
    2. 8.2 霍尔传感器配置和连接
      1. 8.2.1 典型配置
      2. 8.2.2 开漏配置
      3. 8.2.3 串联配置
      4. 8.2.4 并行配置
    3. 8.3 典型应用
      1. 8.3.1 具有电流限制的三相无刷直流电机控制
        1. 8.3.1.1 详细设计过程
          1. 8.3.1.1.1 电机电压
          2. 8.3.1.1.2 使用自动同步整流模式（ASR 模式）
          3. 8.3.1.1.3 功率损耗和结温损耗
  10. 9 电源相关建议
    1. 9.1 大容量电容
  11. 10布局
    1. 10.1 布局指南
    2. 10.2 布局示例
    3. 10.3 散热注意事项
      1. 10.3.1 功率损耗
  12. 11器件和文档支持
    1. 11.1 文档支持
      1. 11.1.1 相关文档
    2. 11.2 支持资源
    3. 11.3 商标
    4. 11.4 静电放电警告
    5. 11.5 术语表
  13. 12修订历史记录
  14. 13机械、封装和可订购信息
    1. 13.1 封装选项附录
    2. 13.2 卷带封装信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

7.3.11 逐周期电流限制

如果流经低侧 MOSFET 的电流超过 ILIMIT 电流，电流限制电路将激活。在电机启动、高扭矩事件或失速情况下可能会产生大电流。限流电路在三相的低侧功率 FET 上使用内部检测 FET。图 7-22 展示了电流限制电路的实现方式。ILIM 引脚通过将 RLIMIT 从 ILIM 连接到 AGND 来设置 ILIMIT。方程式 3 会计算目标 ILIMIT 阈值所需的电阻值，单位为欧姆。

方程式 3. RLIMIT = 9000/ILIMIT

GUID-20231130-SS0I-W2TK-GQSD-G65GW7VMFTDQ-low.svg

图 7-22 电流限制实现

当电流限制激活时，高侧 FET 将禁用，直到下一个 PWM 周期开始，如图 7-23 所示。通过配置 SPI 器件型号中的 ILIM_RECIR 位，低侧 FET 可以在制动模式或滑行（高阻态）模式下运行。在硬件器件中，当限流触发时，该器件在制动模式下运行。

GUID-7E0813DF-FEB6-4F58-A5EA-4215A4407B0F-low.gif图 7-23 逐周期电流限制运行

当电流限制在同步整流模式下激活时，电流通过低侧 FET 再循环，而高侧 FET 被禁用，如图 7-24 所示。当电流限制在异步整流模式下激活时，电流通过低侧 FET 的体二极管再循环，而高侧 FET 被禁用，如图 7-25 所示。

GUID-24438D68-C003-47D9-8336-DD21452A9439-low.gif图 7-24 制动状态
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