在一个设计中用到TPS61160芯片,采用PWM模式,电路是数据表推荐的电路。在常温下可以通过PWM调整背光亮度,但在低温时(-25度)就不能调整亮度了,即使再恢复到常温也不行,需要重启才能继续调整亮度,有人知道原因吗?还有如何避免这种现象?
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IC的调光逻辑跟温度无关,但高低电平逻辑门槛可能会有变化。建议观察下低温下的PWM信号是否有与常温下有异常。