12:46 AM
I must confess that I know very little about NTC as ICL. My only limited experience is using it in temperature compensated sensor circuits. This morning I found the following interesting: electronics.stackexchange.com/questions/527337/…. I am thinking of read the datasheet of the NTC ICL in my junk box.
2 hours later…
3:04 AM
It appears that my NTC5D7 resistance is 5Ω at room temperature, and might drop to 0.3Ω at 2A. I think I need only these two parameters to design my MT3608 test setup.
So I read the above EESE Q&A electronics.stackexchange.com/questions/519685/… with the following comments:
(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
@jonk does not say what resistor load he uses. I guess 5R should ba a good start. I also more or less agree with @TimWescott that I should test everything with the seemingly fake MT3608 boost converteres. This is what I am going to do next. Stay tuned, ...
About AeroSemi
http://www.aerosemi.com/aboutus.html
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。
http://www.aerosemi.com/aboutus.html
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。
3:58 AM
AeroSemi profile is impressive. MT3608 is as impressive. All these years I only know LM2596 step up converter, and almost nothing about step down stuff, and so have developed a slight inferiority complex. Learning MT3608 should be self healing, and stop my bad friends LOL at me, and begin to respect me more than I deserve.
2 hours later…
6:08 AM
2 hours later…
8:36 AM
Now I am testing MT3608 5V stepping up to 12V. I am using a 5V switching PSU as input to MT3608 whose output is adjusted to 12V. Regulation is OK when loading current is within 500mA. At 800 mA, output drops from 12V to 6.6V.
(1) MT3608 works OK if output current is within 500mA range. At 800mA, regulation is poor (12V drops to6.6V)
(2) MT3608 has internal software pull up, therefore no inrush current limit (ICL) or current limiting series resistor at input or output side is required. I have not tested using such protection, and so far so good. Of course this is only a preliminary test, and results is not conclusive.
(4) No spark is detected when connecting either connecting wires direct to load, or by switching the rocker switch. The OP's spark incident is perhaps caused by his wearing nylon fabric, static electric charge induced clothing. Perhaps using a anti-static electric charge wrist band, connecting to ground might verify it.
9:02 AM
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