want_to_see
Newbie level 6
hi all.
I previously built a mosfet driver which drove a N/P array at 120V at 500Khz to 1Mhz.
The device work well but I need more power.
This is for an ultrasound cleaning driver.
Ideally I need something that can drive 200 minimum volts into a capactive load (10nf) while switching at 300 to 500Khz.
Ive looked into high voltage mosfet driver section at IRF, and there are 600 and 1200V sets sold
But the problem is that, via the data sheet, there is a huge amount of heat generated on the driver which limits the frequency response.
With the 600V chips, it starts at around 200Khz and with the 1200, it starts at 100Khz.
Its so close to being usable but I need a few hundread more Khz.
example, ir2184
http://www.irf.com/product-info/datasheets/data/ir2184.pdf
example at 1200V, ir21141 starts to heat at 100Khz
**broken link removed**
Anyone have any ideas on a solution.
Maybe a way to do it without gate driver limitations?
Or alternative devices or chips?
one person even recommended a vacuum tube as they have high bandwidth and are not limited by power. is this feasible?
thanks
I previously built a mosfet driver which drove a N/P array at 120V at 500Khz to 1Mhz.
The device work well but I need more power.
This is for an ultrasound cleaning driver.
Ideally I need something that can drive 200 minimum volts into a capactive load (10nf) while switching at 300 to 500Khz.
Ive looked into high voltage mosfet driver section at IRF, and there are 600 and 1200V sets sold
But the problem is that, via the data sheet, there is a huge amount of heat generated on the driver which limits the frequency response.
With the 600V chips, it starts at around 200Khz and with the 1200, it starts at 100Khz.
Its so close to being usable but I need a few hundread more Khz.
example, ir2184
http://www.irf.com/product-info/datasheets/data/ir2184.pdf
example at 1200V, ir21141 starts to heat at 100Khz
**broken link removed**
Anyone have any ideas on a solution.
Maybe a way to do it without gate driver limitations?
Or alternative devices or chips?
one person even recommended a vacuum tube as they have high bandwidth and are not limited by power. is this feasible?
thanks