Post by thread:[OT] Samsung Rubbish

Well, maybe a tad unfair but ... The KA7605Z regulators that I reported as a great "find" the other day turn out to be only ho-hum. This may be RS's fault as they provided the specs. These do not CLAIM to be low quiescent and indeed they are not - typically 2.5 to 5mA at no load. That's bearable if they meet the low dropout claim - especially the 0.03 volt that RS claim for them. At no load they dropout at around 1.4v differential and this rises to about 1.6V at about 20 mA. Best case this is over 40 times worse than RS's claim. Hmm - maybe the NZ consumer guarantees act may be useful for once ... :-) All this at "room temperature". Definitely not a low dropout part by any definition. About the same as a standard 78L05. Ah well. Russell McMahon _____________________________ - http://www.easttimor.com Updated regularly: 100,000 refugees STILL in West Timor face starvation! - http://www.sudan.com And you think Kosovo and Chechnya are bad! What can one man* do? Help the hungry at no cost to yourself! at http://www.thehungersite.com/ (* - or woman, child or internet enabled intelligent entity :-))

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 At 09:40 PM 4/15/00 +1200, Russell McMahon wrote: >At no load they dropout at around 1.4v differential and this rises to about >1.6V at about 20 mA. >Best case this is over 40 times worse than RS's claim. >Hmm - maybe the NZ consumer guarantees act may be useful for once ... :-) At what current level is the dropout voltage specified? - -- Are you an ISP? Tired of spam? http://www.spamwhack.com A pre-emptive strike against spam! Where's Dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.2 for non-commercial use <http://www.pgp.com> iQA/AwUBOPjLCYFlGDz1l6VWEQLLAACg/Qe5lzXeBEiJqhWzGx9GOuHbf4sAnR7c kwyEPW35/JObgeUWRmIxHdr5 =rm1a -----END PGP SIGNATURE-----

>>At no load they dropout at around 1.4v differential and this rises to about >>1.6V at about 20 mA. >At what current level is the dropout voltage specified? Dave, It's a "best case" spec but as I noted - at NO LOAD it's actually 1.4 volt and gets worse from there so it's never going to be 0.03V in practice - unless they measure it at negative load :-). RM

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 >It's a "best case" spec but as I noted - at NO LOAD it's actually 1.4 volt >and gets worse from there so it's never going to be 0.03V in practice - >unless they measure it at negative load :-). > >RM Just checking, sometimes spec sheets are written in a manner that is pretty misleading. It's also possible that it wouldn't hold LDO at <no> load, and that might be in spec depending on the part. Sounds like someone sold them the wrong parts. You're right, that certainly wouldn't fit my concept of an LDO! - -- Are you an ISP? Tired of spam? http://www.spamwhack.com A pre-emptive strike against spam! Where's Dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.2 for non-commercial use <http://www.pgp.com> iQA/AwUBOPk8VYFlGDz1l6VWEQKdugCgqrNmv4O4bTgIAf4BDiTrEMLSdNcAoMtK UjY/chcBCdZ1uRNTU7H0PFbY =qASv -----END PGP SIGNATURE-----