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关于BQ24040/BQ24090 ISET 和ISET2管脚的使用问题 ？

user6223547
Prodigy 20 points

芯片手册对于ISET和ISET2的描述如下：

ISET:  Programs the Fast-charge current setting. External resistor from ISET to VSS defines fast charge current value. Range is 10.8k (50mA) to 540 Ω (1000mA).

ISET2:Programming the Input/Output Current Limit for the USB or Adaptor source: High = 500mAmax, Low = ISET, FLOAT = 100mA max.

我的疑问如下：在ISET2 = HIGH时，输入/输出电流最大为500mA，这时如果设置RISET = 540 Ω (1000mA) ，ISET2已经限制了最大电流，怎么实现快速充电电流的1000mA ?

  • 0
    TI__Guru*** 130456 points
    The charge rate of either USB or AC mode is set by ISET1. If in USB mode, and ISET1 current is more than USB input current setting, charge current will be equal to USB input current setting.
    USB mode input current is set by ISET2.
    ISET2 pin will program input - output current for USB or Adaptor:
    Low = ISET -- current set by R38 resistor of 1k will set current to about 540mA
    High=500mA -- current limited to 500mA max
    Float=100mA -- current limited to 100mA max
  • 0 回复 Star Xu
    Prodigy 20 points

    Thanks for your answer。