Part Number:LMG1205
Hi Don,
I was unable to reply to the previous post (just a blank page when I clicked on it), so I have created a new thread.
In answer to your question, this is our schematic. We have used this successfully in the past to achieve <50ns rise/fall times in a pulsed system at around 10 to 20% duty cycle. We are interested in being able to run this circuit up to 100% duty as we have some test modes where the customer wishes to have the load permanently on. This is not a conventional power supply application, rather we are switching the drain supply of a RF amplifier which runs at 5V. For other applications we sometimes wish to run at 20 or 30V drain supply. (we are also planning to increase the bootstrap cap to ~1uF and Vdd bypass to 10uf)
Kind regards
Mike
Hi, Mike,
Thanks for your question, and your interest in our gate drivers.
It needs to be a little more involved than a resistor. The issue is when you turn off the high-side, the voltage will increase past the voltage rating of the EPC2108's gate and damage it since you would be circumventing the protection we have built in the LMG1205.
You might be able to do something like this, but the difficulty is going to be to keep the output voltage within safe limits for the LMG1205's gate voltage limits.
Alternately, can you switch at like 99% duty cycle to allow the bootstrap cap a chance to recharge?
Can you share a little more about your application?