Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I want to use this mosfet irfz44n, to drive a highly inductive load, (Coils of a coilgun). Which fly-back protection diode do you recommend.
(I will be using 12V system and the coils will draw around 6A).
Since your coil is basically an air-core coil, it has much less inductance than say a relay or a solenoid. The diode has to carry the coil current, but only for a few msec. Even a nominal 1A 1N400X will handle a 6A pulse provided it happens less than a few times per second. Look at the data sheet. It shows the derating from the non-recurring max pulse based on how frequently it happens...
Thanks for the response, Mike.
Since the coils would have an iron rod (moving through them), I thought they had high inductance. And also because they produced deadly sparks when connecting via bare wires, I thought they need good fly-back protection.
I am going to use 1n4007 then.
1n4000 series are rated for 30A Ifsm.
Are 1n4000 series capable of quicly conduction in the forward direction, so that the mosfet won't experience any spikes? When do i need to use fast diodes such as 1N4148?
hi mike,
sorry to ask basic electronics, but whats the difference between rectifier diode & small signal diode? (I thought they are distinguished by there current capacity and response time) and why do I need rectifier diode here?
The datasheet says that 1N4148 is a high speed diode. (I have been using it for fly-back protection from relays, in several of my circuits)
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.