【应用】功耗低至8μA的国产电压基准LM285用于故障指示器,构成组件简单,长期稳定性良好且噪声低
故障指示器是电力监测的关键节点,负责采集线路电流、对地电场等实时信息,并对故障发生时的电流及电场波形进行数字化同步录波。客户故障指示器项目需求国产化,其中系统对低功耗要求比较高,主控芯片内置的ADC采集时需要外部提供1.2V基准电压,电压基准源功耗要求低至10μA,系统简单原理框图如下:
本文推荐华冠半导体电压基准LM285,该品是一种双极工艺技术制作的微功耗带隙基准电压源,在提供精密基准的同时,只需极低的负载电流,因此特别适用于微功耗电路,可在10μA~20mA电流范围内工作,精度±4mV(±0.3%),十分适合故障指示器应用。其电参数如下:
综上所述,在故障指示器上采用LM285具有以下优势:
1、最小工作电流低至8μA,十分适合系统所需超低功耗;
2、构成组件仅有晶体管和电阻,具有很低的噪声和良好的长期稳定性,可以有效增加产品使用寿命;
3、国产型号交期很好,符合项目国产化要求。
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华冠半导体宣传册
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可定制DC风扇的尺寸范围:15mm~225mm;转速:≤16500 RPM;噪音:≥10.4dB,还可定制厚度、电压、风量、风压等参数,符合 RoHS 标准。
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