Thanks Jay - Yep its a concern especially having read and digested your warnings on changing to higher gate capacity devices, but Im only going to use the new FET devices, or at least test them, in the 500W mode which I should have indicated - so with just two FETS and reading the application notes the 2110 hopefully will be adequate at 475kHz to drive into the combined gate load. Ill know pretty quickly -
I read the blog http://tahmidmc.blogspot.com/2013/01/using-high-low-side-driver-ir2110-with.html
which contains a load of additional info and one of the directives this guy had is to strap a 1K ohm resistor between the Gate and (source)deck to stop unwanted ONs (big bangs) due to potential floating gate charges and or Miller effects etc; wonder what your thoughts are there and in your design are the devices considered to be driven as a low side and therefore each FET could have a 1K inserted as insurance or are they pseudo in parallel (don't think so) in which case the R value would be 2K etc. The guy writes quite well..
The Alaska permanent dividend (oil) fund (1884 bucks this year ) funded this experiment :-) ps do you have any 79 material left?
thanks again for the support
ps overnight just West coastish paths openings on WSPR2 - Im sure we will cross the West East barrier sooner or later...a lot of the stations were suffering from Tstorms or for KH6 hurricane warnings -
From: [email protected]
To: [email protected]
Date: Tue, 14 Oct 2014 07:31:56 -0400
Subject: LF: Re: Alternatives Re: STW34NB20 - used in a number of MF and LF PA designs
At over twice the input capacitance expect my
driver circuit to come up short ;~( .
Jay W1VD WD2XNS
----- Original Message -----
Sent: Monday, October 13, 2014 8:15
Subject: LF: Alternatives Re: STW34NB20 -
used in a number of MF and LF PA designs