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BQ24600充电电流不能配置

原理图如下面图片,4节锂电池,输入电压24V,当不接锂电池的 时候,输出的电压超过21V,连接上锂电池后,由于24V电源驱动能力有限,电源被拉低至锂电池电压14.6V,充电电流就是电源的最大负载能力3A,调节ISET电压值至0.5V以下,上述现象不变。请大家帮忙看看是什么问题。谢谢