(1) I purchased some cheap boards at about $1 each. The first one I quickly destroyed. But I pretty much knew the problem then. It cannot be powered up without a load present. (It destroys itself without one.) Adding a simple resistor was all that was needed. I've had zero problem with the rest of them. . – @jonk 2020Sep02

(2) The alternative is to go ahead and buy cheap stuff from the surplus or China market, and test everything as it comes in the door. For instance, I'm pretty sure those power supply modules that are so ubiquitous are just copied from vendor's data sheets, without any characterization or testing. – @TimWescott 2020sep02

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西安航天民芯科技有限公司成立于2011年2月， 公司依托雄厚的航天资源优势和品牌优势，以核心团队的技术优势为中心，专注于开发新能源汽车动力电池管理系统、动力电池充电管理芯片、电池电源管理系统芯片、智能家居和物联网芯片、电机管理系统芯片、LED绿色照明驱动芯片、高集成度移动信息终端电源管理单元（PMU）、高低压DC/DC、AC/DC转换器等系列化战略新兴产业电源管理芯片产品及解决方案。

目前公司产品谱系包括动力电池BMS管理系统芯片、32BIT ARM M0系列MCU芯片、BLDC电机控制和管理芯片、高速高精度ADC和DAC芯片、WLED DRIVER、SWITCH CHARGER、HV BUCK DC/DC、AC/DC转换器、音频功放、LED TV专用芯片等。

经过多年的发展，已成长为一家年销售额过亿的规模集成电路设计企业。公司已通过国家级集成电路设计企业、高新技术企业、ISO9001：2015质量体系等多项资质的认证。