I am currently using the LMG5200 to control the drain volatage on 10W RF amplifiers at around 20v. I have also used it for controlling 50v Drain voltages to an RF FET. As long as I have used this chip it has been unreliable. I have done my best to check its layout and setup against ti reference designs and application notes and can't find any obvious things being done wrong in my setup. I am wondering if there is a common mistake people using these chips for this type of application might make. The chip goes into a hard failure sporadically and needs to be replaced. When the chip fails it stops switching the voltage to the RF drain or sometimes it only switches a little bit of voltage and seems to draw more current than necessary almost as if it is internally shorted.
Hello Matt,
Are you using LMG5200 now as a linear amplifier? LMG5200 is a GaN power stage actually for switched-mode power supply. We do not recommend it for linear power application. That will bring a lot of excessive heat to it and we have test it for this application also.
Thanks and regards,
Lixing
No we are using it as a power supply really. When it is on it connects a dc voltage to the drain of an amplifier when off it grounds the drain voltage of the amplifier.
