choosing the right semiconductor

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billybob

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I'm trying to find a semiconductor (npn is preferred) that can handle high frequency in the range of 20khz and as much current possible in the to22 package.
I will attach a heat sink to the transistor. It will be used to drive a small high voltage transformer.

Thank you,
ben
 
20KHz isn't high frequency, in fact it's VERY low frequency as far as transistors are concerned.

Do you mean TO220?.

If you're wanting high current them look at FET's there are some MASSIVE TO220 FET's available - one is rated at 220A.
 
You need to describe how transistor is driven. Using a MOSFET if the interface meant for bipolar
could cause problems, and vice versa. Is it a PWM interface or simple on / off switch type of drive ?
As well type of load, inductive, resistive, and voltage rating needed, etc... Power devices have to be
chosen over a number of design criteria, not in the least SOA considerations.


Regards, Dana.
 
Last edited:
Nigel Goodwin said:
20KHz isn't high frequency, in fact it's VERY low frequency as far as transistors are concerned.

Do you mean TO220?.

If you're wanting high current them look at FET's there are some MASSIVE TO220 FET's available - one is rated at 220A.
Click to expand...
Yes TO220 is what I meant. I’m mostly looking for one that has a low internal resistance so it doesn’t require a huge heat sink.
 
I need two for an astable multi oscillator type circuit. The transistors (or mosfets) will be used as simple switches. I hope that answers your question.
 
billybob said:
I need two for an astable multi oscillator type circuit. The transistors (or mosfets) will be used as simple switches. I hope that answers your question.
Click to expand...
Those crude multi-vibrator circuits are generally pretty crap, very inefficient, and need much larger heat sinks because of it. They are also renowned for their unreliability, as the 'design' is so poor.
 
Nigel Goodwin said:
Those crude multi-vibrator circuits are generally pretty crap, very inefficient, and need much larger heat sinks because of it. They are also renowned for their unreliability, as the 'design' is so poor.
Click to expand...
What circuit would you recommend for switching a small high voltage transformer then?
 
I’m trying to produce steady arcs about a half an inch to an inch gap from parts and a circuit that take up the least amount of space possible.

I don’t see the link you mentioned above
 
Well damn - lost the link somewhere?

It was here:

2.19US $ 1% OFF|8-32v To 45-390v Dc-dc Boost Converter Step Up Power Supply Module High Voltage Zvs Capacitor Charging Board - Integrated Circuits - AliExpress

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However, now you've mentioned what you're looking for, try this link:

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