Return-Path: X-Spam-DCC: paranoid 1170; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.2 required=5.0 tests=BAYES_00,FORGED_HOTMAIL_RCVD, HTML_50_60,HTML_MESSAGE autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id s9EH8AZ8021448 for ; Tue, 14 Oct 2014 19:08:11 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Xe5Sa-00066C-21 for rs_out_1@blacksheep.org; Tue, 14 Oct 2014 18:00:32 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Xe5SZ-000663-JV for rsgb_lf_group@blacksheep.org; Tue, 14 Oct 2014 18:00:31 +0100 Received: from blu004-omc1s17.hotmail.com ([65.55.116.28]) by relay1.thorcom.net with esmtps (TLSv1.2:AES256-SHA256:256) (Exim 4.82) (envelope-from ) id 1Xe5SW-0002Cb-Lw for rsgb_lf_group@blacksheep.org; Tue, 14 Oct 2014 18:00:30 +0100 Received: from BLU177-W32 ([65.55.116.7]) by BLU004-OMC1S17.hotmail.com over TLS secured channel with Microsoft SMTPSVC(7.5.7601.22751); Tue, 14 Oct 2014 10:00:26 -0700 X-TMN: [CrU574D+AwdtfvRH+FziASi8Ly4LLWCZ] X-Originating-Email: [hellozerohellozero@hotmail.com] Message-ID: From: Laurence KL7 L To: "rsgb_lf_group@blacksheep.org" Date: Tue, 14 Oct 2014 09:00:25 -0800 Importance: Normal In-Reply-To: <005c01cfe7a2$761d1790$6401a8c0@JAYDELL> References: <003a01cfe4b7$7706b4b0$4201a8c0@yourc44d19af4e> ,<005201cfe4c0$e985af60$4201a8c0@yourc44d19af4e> ,<00a801cfe4f7$936c7f50$4201a8c0@yourc44d19af4e> ,<005c01cfe7a2$761d1790$6401a8c0@JAYDELL> MIME-Version: 1.0 X-OriginalArrivalTime: 14 Oct 2014 17:00:26.0440 (UTC) FILETIME=[59E49480:01CFE7D0] X-Scan-Signature: bf14357d5ee2e4a717b88d90ab36122c Content-Type: multipart/alternative; boundary="_efb47739-2c4e-4315-9bc0-79a2f1d02a9b_" Subject: LF: : Alternatives Re: STW34NB20 - STW70N60M2?? Jays response X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: RO X-Status: X-Keywords: X-UID: 777 --_efb47739-2c4e-4315-9bc0-79a2f1d02a9b_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks Jay - Yep its a concern especially having read and digested your war= nings on changing to higher gate capacity devices=2C but Im only going to u= se the new FET devices=2C or at least test them=2C in the 500W mode which= I should have indicated - so with just two FETS and reading the applicati= on notes the 2110 hopefully will be adequate at 475kHz to drive into the c= ombined gate load. Ill know pretty quickly - =20 I read the blog http://tahmidmc.blogspot.com/2013/01/using-high-low-side-dr= iver-ir2110-with.html which contains a load of additional info and one of t= he directives this guy had is to strap a 1K ohm resistor between the Gate a= nd (source)deck to stop unwanted ONs (big bangs) due to potential floating= gate charges and or Miller effects etc=3B wonder what your thoughts are th= ere and in your design are the devices considered to be driven as a low sid= e 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 e= tc. The guy writes quite well.. =20 The Alaska permanent dividend (oil) fund (1884 bucks this year ) funded thi= s experiment :-) ps do you have any 79 material left? =20 thanks again for the support =20 ps overnight just West coastish paths openings on WSPR2 - Im sure we will c= ross the West East barrier sooner or later...a lot of the stations were suf= fering from Tstorms or for KH6 hurricane warnings -=20 =20 Laurence KL7L =20 From: jrusgrove@comcast.net To: rsgb_lf_group@blacksheep.org Date: Tue=2C 14 Oct 2014 07:31:56 -0400 Subject: LF: Re: Alternatives Re: STW34NB20 - used in a number of MF and LF= PA designs =0A= =0A= =0A= =0A= =0A= =0A= =0A= Laurence=0A= =0A= At over twice the input capacitance expect my =0A= driver circuit to come up short =3B~( .=0A= =0A= Jay W1VD WD2XNS =0A= WE2XGR/2 =0A= =0A= ----- Original Message ----- =0A= From: =0A= Laurence KL7 L =0A= To: rsgb_lf_group@blacksheep.org =0A= =0A= Sent: Monday=2C October 13=2C 2014 8:15 =0A= PM=0A= Subject: LF: Alternatives Re: STW34NB20 - =0A= used in a number of MF and LF PA designs=0A= =20 STW70N60M2 =0A= 600V VDs 0.031 Ohm on and Imax as 68A - Ill let you know how =0A= they work in cct but it looks like completely over the top Gold over =0A= engineered FET device but I need the insurance give the changes and sudde= n =0A= animal interventions/weather I get up here in Alaska -=20 =20 http://www.mouser.com/ProductDetail/STMicroelectronics/STW70N60M2/?qs=3DRlw= i1sSxVL4hmaII3E%2FvIA%3D%3D =20 I =0A= temp switched over to a 600V FET=2C the end of life or about to be http:/= /www.mouser.com/ProductDetail/STMicroelectronics/STW16N65M5/?qs=3DsGAEpiMZZ= MutXGli8Ay4kNbVQor0Njej2JFFy%252bQzHzg%3d =20 this =0A= is a "smaller" I tot device and gets a little warmer than more lower Ron = ohms =0A= 34NB20 but was running fine in 1Kw W1VD design with no change in tap poin= ts =0A= out optimizing the Voltage/Current ratios.... I have a pair of them at 30= 0W =0A= out and effieciency was about 72% or so. I didnt see any peaky waveform o= n the =0A= drains either.. =20 All =0A= being well Ill be on WSPR2 630m tonight - weather up here is far too warm= - =0A= lake ice has melted and the ducks and Swans are back enroute =0A= South =20 Laurence =0A= KL7L =20 =20 = --_efb47739-2c4e-4315-9bc0-79a2f1d02a9b_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Thanks Jay - Yep its a concern e= specially having read and digested your warnings on changing to higher = =3Bgate capacity devices=2C but =3BIm only going to use =3Bthe new = FET devices=2C or at least test them=2C =3B  =3Bin the 500W mode wh= ich I should have indicated -  =3Bso with just two FETS and reading the= application notes the 2110 hopefully  =3Bwill be adequate at 475kHz to= drive into the combined =3Bgate load. Ill know pretty quickly -
&nb= sp=3B
I read the blog http:= //tahmidmc.blogspot.com/2013/01/using-high-low-side-driver-ir2110-with.html=  =3Bwhich contains a load of additional info and one of the directi= ves this guy had is to strap a 1K ohm resistor between the Gate and =3B= (source)deck to stop unwanted ONs (big bangs) due to potential =3Bfloa= ting gate charges =3Band or Miller effects etc=3B wonder =3Bwhat yo= ur thoughts are there and in your design are the devices considered to be d= riven as a low side and therefore each FET could have a 1K inserted as insu= rance or are they pseudo in parallel (don't think =3Bso) =3Bin whic= h case the R value would be 2K etc. The guy writes quite well..
 =3B=
The Alaska permanent dividend (oil) =3Bfund (1884 bucks this year&n= bsp=3B) funded this =3Bexperiment =3B:-) ps do you have any 79 mate= rial left?
 =3B
thanks again for the support
 =3B
ps ov= ernight 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 sufferin= g from Tstorms or for KH6 hurricane warnings -
 =3B
Laurence KL7= L
 =3B
From: jrusgrove@comcast.netTo: rsgb_lf_group@blacksheep.org
Date: Tue=2C 14 Oct 2014 07:31:56 -04= 00
Subject: LF: Re: Alternatives Re: STW34NB20 - used in a number of MF = and LF PA designs

=0A= =0A= =0A= =0A= =0A= =0A= =0A=
Laurence
=0A=
 =3B
=0A=
At over twice the input capacitance&nb= sp=3Bexpect my =0A= driver circuit to come up short =3B~( .
=0A=
 =3B
=0A=
Jay W1VD =3B WD2XNS =3B =0A= WE2XGR/2 =3B
=0A=
=0A=
----- Original Message -----
=0A=
From: =0A= Laurence KL7 L
=0A= =0A=
Sent: Monday=2C October 13=2C 2014 8:15 =0A= PM
=0A=
Subject: LF: Alternatives Re: STW34NB20 - =0A= used in a number of MF and LF PA designs
=0A=

STW70N60M2 =3B =0A= 600V VDs =3B 0.031 Ohm on and Imax as =3B68A =3B - Ill let yo= u know how =0A= they work in cct but it looks like completely over the top Gold over =0A= engineered FET device but I need the insurance give the changes and sudde= n =0A= animal interventions/weather I get up here in Alaska -
 =3B
http://www.mouser.com/P= roductDetail/STMicroelectronics/STW70N60M2/?qs=3DRlwi1sSxVL4hmaII3E%2FvIA%3= D%3D
 =3B
I&nbs= p=3B =0A= temp switched over to a 600V FET=2C the end of life or about to be http://www.mouser.com/ProductDetail/STMicroelectro= nics/STW16N65M5/?qs=3DsGAEpiMZZMutXGli8Ay4kNbVQor0Njej2JFFy%252bQzHzg%3d
 =3B
this =0A= is a "smaller" I tot device and gets a little warmer than more lower Ron = ohms =0A= 34NB20 but was running fine in 1Kw W1VD design with no change in tap poin= ts =0A= out optimizing the Voltage/Current ratios.... I have a pair of them at 30= 0W =0A= out and effieciency was about 72% or so. I didnt see any peaky waveform o= n the =0A= drains either..
 =3B
All =0A= being well Ill be on WSPR2 630m tonight - weather up here is far too warm= - =0A= lake ice has melted =3B and the ducks and Swans are back enroute =0A= South
 =3B
Lauren= ce =0A= KL7L
 =3B
=  =3B

 =3B
= --_efb47739-2c4e-4315-9bc0-79a2f1d02a9b_--