电路图和测试数据如下,pwm为3.3V,1k的。
| 现在用pwm接一阶rc滤波然后串电阻进xtr115, 测试发现占空比大于30 输出电流的线性是很好的。小于30就不行了。测试了下2脚电阻输入电压发现整个过程电压是线性的,这样不就说明RC滤波没问题。 难道是芯片坏了,也没这么个坏法的吧... 请教各位前辈是我哪里做得不对? |
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