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???
06/19/08 08:57
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 		 #156034 - High in-rush current consideration
Responding to: ???'s previous message
Is it the same old project you are still working on ?

http://www.8052.com/forum/thr...read=96997

Now coming back to this thread, are you using a 12V/400mA solenoid or 12V / 1 Amp?

Even if it is 400mA solenoid, BS170 is really not suitable choice. Due to high in-rush current drawn by any inductive load, care must be taken to chose a suitbale device capable of handling the worst case conditions. I already invited your attention to this issue in your old thread:

http://www.8052.com/forum/read.phtml?id=97328


Muhammad Naeem said:
Can any body give me why MOSFET burn out.


The answer is very simple - [b][u]Absolute Maximum Ratings [/u][/b] are exceeded.



List of 40 messages in thread
TopicAuthorDate
How to drive solenoids?            01/01/70 00:00      
   Sure a MOSFET but do consider...            01/01/70 00:00      
      Give more infomation?            01/01/70 00:00      
         Suggestons            01/01/70 00:00      
            MOSFET burn out?            01/01/70 00:00      
               possibly            01/01/70 00:00      
               Discharging coil            01/01/70 00:00      
                  Overkill            01/01/70 00:00      
                  Most MOSFETs have those built-in.            01/01/70 00:00      
      same GND bus.            01/01/70 00:00      
         no            01/01/70 00:00      
   Use a solenoid driver!            01/01/70 00:00      
   same GND bus.            01/01/70 00:00      
      High in-rush current consideration            01/01/70 00:00      
         mosfet drive from logic level?            01/01/70 00:00      
            Availability vs Suitability            01/01/70 00:00      
            mosfet drive from logic level            01/01/70 00:00      
               for googling purposes            01/01/70 00:00      
                  not exactly            01/01/70 00:00      
                     using google            01/01/70 00:00      
   about the solonoid valve            01/01/70 00:00      
   ABOUT THE S.V.            01/01/70 00:00      
   H11B1 and IRF510 Drive solenoid But....?            01/01/70 00:00      
      Sounds like inadequate power supply            01/01/70 00:00      
         Suitable Power supply.            01/01/70 00:00      
            12V 6.5A?            01/01/70 00:00      
            Think about it!            01/01/70 00:00      
      do the math            01/01/70 00:00      
   12v 8A power supply            01/01/70 00:00      
      none, except            01/01/70 00:00      
         also            01/01/70 00:00      
      Maybe a better starting point is....            01/01/70 00:00      
      Ever heard of fuses...            01/01/70 00:00      
         difficult, ....            01/01/70 00:00      
            plural            01/01/70 00:00      
               I do not understand            01/01/70 00:00      
                  Split tree of protection...            01/01/70 00:00      
                     Absolutely!            01/01/70 00:00      
                        well,            01/01/70 00:00      
                        The name used...            01/01/70 00:00      

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