Buz11 Mosfet

[abbarue]

Does anyone know what the max frequency range is for the
Buz11 Mosfet?
I've been googling for hours and can't find it.
Thanks

 

[mneary]

It's expressed as 'delay time'. Add up the relevant numbers. Beware that the most difficult part of switching a MOSFET is charging and discharging the gate.

 

[abbarue]

The turn on time is 40 ns
Rise time 200 ns
turn off delay time 240 ns
fall time 110 ns
How do I convert that into max. operating frequency?

 

[hotwaterwizard]

Here is the Datasheet

 

[Hero999]

What do you mean by maximum operating frequency?

Do you mean gain bandwidth product or are you talking about low loss switching?

 

[hotwaterwizard]

http://www.sengpielaudio.com/calculator-timeconstant.htm

**broken link removed**

nanosecond unit
(ns) 10^-9 seconds; one thousand millionth part of a second.
This is the unit in which the fundamental logical operations of modern digital circuits are typically measured. For example, a microprocessor with a clock frequency of 100 megahertz will have a 10 nanosecond clock period.

 

[hotwaterwizard]

nanosecond unit
(ns) 10^-9 seconds; one thousand millionth part of a second.
This is the unit in which the fundamental logical operations of modern digital circuits are typically measured. For example, a microprocessor with a clock frequency of 100 megahertz will have a 10 nanosecond clock period.

https://dictionary.reference.com/browse/nanosecond

If this Quote is true then:


The turn on time is 40 ns = 400 mhz
Rise time 200 ns = 2000 mhz
turn off delay time 240 ns = 2400 mhz
fall time 110 ns = 1100 mhz

 

[hotwaterwizard]

**broken link removed**
http://www.sengpielaudio.com/calculator-period.htm

 

[audioguru]

https://dictionary.reference.com/browse/nanosecond

If this Quote is true then:


The turn on time is 40 ns = 400 mhz
Rise time 200 ns = 2000 mhz
turn off delay time 240 ns = 2400 mhz
fall time 110 ns = 1100 mhz

I think your numbers are backwards, John.
A longer time is a lower frequency, not a higher frequency.

One cycle of 400MHz lasts for only 2.5ns.
One cycle of 2000MHz lasts for 0.5ns.
The total of the rise time, turn off delay time and fall time must be less.

 

[Hero999]

To answer the question the maximum frequency you can switch the MOSFET on and off at is 1/(the sum of all those delays) which is 1/590ns but I doubt you'd get a very good sinewave at that frequency due to the slew rate distortion.

 

[abbarue]

A lot of info here. But I just want to know what the highest recomended operating frequency is for these mosfets.
Most transistors tell you in there data sheet what there frequency range is.
I don't know why they don't do that for the BUZ11 mosfet.
The data sheet mentions 4 different time periods
Should I take the highest of these and multiply it by 4 to get the most efficient time period?
240ns x 4 = 960ns rounded out to 1000ns per cycle.
Now how do I convert that to frequency?
Is it 1 Mhz?

 

[Nigel Goodwin]

Why don't you just tell us what you're trying to do?.

Isn't a BUZ a switching device, and not an amplifier?, so frequency doesn't apply.

 

[Krumlink]

maybe how many times it can switch at a given frequency? Not completely sure, but I think this is what he means.