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Engineering
Electrical Engineering
Transistor questions in control a stepper motor
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[QUOTE="Sherldonnnn, post: 5529777, member: 599889"] Hello, I am Sherldonnnn. I'm very happy I can ask my questions here to get your help. If you can help me solving my questions that will be very nice. Now I am trying to control a stepper motor with a simple transistor-based switch. I still with to consult with the experts here on some basic questions: The transistor I bought from kynix semiconductor has labeling as "S8050 D 331". I used a multimeter to measure its hfe value and it shows 186 (varying between 186 and 188). [ATTACH=full]103872[/ATTACH] However, when i browsing kynix electronics .I found a document from [URL]http://www.kynix.com/Detail/650928/S8050.html[/URL] which appears to me somewhat confusing: [ATTACH=full]103873[/ATTACH] 1. There are hfe1, hfe2, hfe3for this S8050 transistor and for each there are associated MIN, TYP and MAX value. for hfe1and hfe3there areonlya MIN value, but for hfe2the values MIN, TYP and MAX areallexist. Why is the difference? 2. What does hfe1, hfe2and hfe3mean? If they all exist, do I still have a unique value? Which one of them correspond to the186value which I got from the multimeter? 3. Why for each of them there are a range of values (MIN, TYP, MAX)? If the hfe has, for example like hfe2, MIN value as low as100and MAX as high as400, then how can I know exactly which hfe value the transistor will operate on, and consequently, how should I design the circuit (resistance values, saturation mode, etc.)?I could hardly see any clue in this data sheet. Help will be greatly appreciated. Thanks a lot. Regards, Sherldonnnn [ATTACH=full]103874[/ATTACH] [/QUOTE]
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Transistor questions in control a stepper motor
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