Pre-biased MOSFET?

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Old 08-04-18, 09:20 AM
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Pre-biased MOSFET?

Can anyone recommend a pre-biased MOSFET (or any other fast switching transistor) for my car project? There is TTL level signal in ECU output and the load is COP (coil on plug). I'm not sure about these COP's (I don't have them yet), but from what I have seen on the net the current is up to 6 A and the self-induced impulse in primary coil is up to 350 V. So I figure it has to be at least 10 A and 500 V.

Edit: Found this, won't break the bank and seems to fit the job.
 

Last edited by Bitjam; 08-04-18 at 11:23 AM.
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Old 08-04-18, 11:50 AM
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I don't think TTL will give enough drive.. Check out fig3.
 
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Old 08-04-18, 02:38 PM
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Thanks for pointing this out. Maybe I need to add a transistor then. If I can't find a better MOSFET, that is.
 
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Old 08-05-18, 11:02 AM
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Here again...... what is it you are trying to do ??
 
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Old 08-05-18, 12:42 PM
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Not sure what you ask, anything I can add to the information in my initial post?
 
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Old 08-05-18, 12:48 PM
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You're asking about a mosfet. What are you wanting it to do ?
It is not easy to integrate the spark signal into an electronic circuit.

In other words..... what is the project ?
 
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Old 08-06-18, 04:40 PM
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Project is simple. There is a custom ECU - which outputs at TTL level. (Its output can be inverted in software if needed.) And there are COP's that need to be driven by this ECU. The "amplifier" is missing. As I said above, the COP current is up to 6 A and the impulse in primary is up to 350 V. So that device must withstand a voltage spike. If you can recommend such an amplifier then I'm all ears, that little car of mine has 12 cylinders, BTW. Hmmm ... perhaps two 6 cylinder units is a good idea ...

Edit-0: Getting closer ...

Edit-1: Yup, looks like a winner, less than $2 each from mouser.com. Having a closer look it is more like an IC with everything needed built in. I like that. Keeps the project simple.
 

Last edited by Bitjam; 08-06-18 at 05:13 PM.
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