Class D with above 2.5Mhz output?

[chchyong89]

Is there any class D amplifier that is fast enough to have 50V/us or above? So i am expecting the output pwm is beyond 2.5Mhz.

So i am looking for an chip Class D that able to work over 200khz, and if possible DC output too!

I have bought some irs2092, TPA3255, but their output is just around 400~500khz.

Attached is the output that i wish to generate, and the load will be very low.

I have tried to drive with 4xparallel LME49600, surprisingly they cant do the job.

 

[Osvaldo de Banfield]

My simple design runs at 280KHz without any truoble.

 

[Mark Tillotson]

Is there any class D amplifier that is fast enough to have 50V/us or above? So i am expecting the output pwm is beyond 2.5Mhz.

That's GaNFET territory I think.

 

[MorbidFractal]

Looks very much like you are trying to recreate the drain waveform on a single/two switch forward/flyback convertor?

 

[chchyong89]

That's GaNFET territory I think.

I am considering Ganfet too...

 

[chchyong89]

Looks very much like you are trying to recreate the drain waveform on a single/two switch forward/flyback convertor?

It is for piezo actuator use.

 

[littleyam]

I know that waveform. It's from a piezoelectric printhead The original design actually switches up to 5MHz.

I have used ganfet with some success to replicated the waveform, but I do not have time to debug everything. Class AB with heatsink and some airflow work fine for us.

 

[chchyong89]

Haha yes its inkjet piezos, guess you are from the same industries with me too.

 

[chchyong89]

this is the epson soc that translate paralleled dac data into high and low side pwm driving signals thats up to 2.5mhz++! interesting little high speed DAC