LM series regulators from ST = TRASH

-_nando-_ · 12th September 2007, 10:25 AM

Hi there,

DON'T buy ST regulators, they are BAD. My devices are GENUINE, and my LM7915 gives-me -16,5v while my National give me -14,92v.

I don't like much ST. Their power transistors are much more difficul to match than Fairchild for example, and I had a bad experience with their regulators today. I'm using their AMP, TDA7293V, and it performs VERY WELL despite the other bad experiences...

Best Regards !

AKN · 12th September 2007, 11:00 AM

Quote:

Originally posted by -_nando-_
Hi there,

DON'T buy ST regulators, they are BAD. My devices are GENUINE, and my LM7915 gives-me -16,5v while my National give me -14,92v.

Hi,

No load during your test? At least 5mA is required in order for the regulator to function properly.
-16.5V is way out of spec.

peranders · 12th September 2007, 11:40 AM

Exactly, do read the datasheet!

consort_ee_um · 12th September 2007, 12:31 PM

Also, I found you need !uF of output capacitance to avoid oscillation on the negative regulators whereas you only need 0.1uF with the positive ones.

peranders · 12th September 2007, 01:58 PM

79xx and 78xx are quite different if you check the simplied schematics.

-_nando-_ · 13th September 2007, 02:57 AM

I didn't test it with a load, but it have a 100nF cap on it's output. Without load, the regulator from National gives a good voltage regulation, while the ST don't. I didn't test ST with load, as I tested it and after the reading I replaced immediatelly.

peranders · 13th September 2007, 04:13 AM

BC550 from ON is not 100% compatible with BC550 from Fairchild. The same goes for these regulators.

Leolabs · 18th September 2007, 02:18 AM

Oscillation???

-_nando-_ · 18th September 2007, 05:35 AM

No oscilation

megajocke · 19th September 2007, 09:13 AM

Quote:

Originally posted by -_nando-_
I didn't test it with a load, but it have a 100nF cap on it's output. Without load, the regulator from National gives a good voltage regulation, while the ST don't. I didn't test ST with load, as I tested it and after the reading I replaced immediatelly.

Don't blame the regulator then if you did not use a load, the datasheet says it needs a minimum load.

12th September 2007, 10:25 AM	#1
-_nando-_ diyAudio Member Join Date: Dec 2005 Location: Sao Paulo	LM series regulators from ST = TRASH Hi there, DON'T buy ST regulators, they are BAD. My devices are GENUINE, and my LM7915 gives-me -16,5v while my National give me -14,92v. I don't like much ST. Their power transistors are much more difficul to match than Fairchild for example, and I had a bad experience with their regulators today. I'm using their AMP, TDA7293V, and it performs VERY WELL despite the other bad experiences... Best Regards !

12th September 2007, 11:40 AM	#3
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Exactly, do read the datasheet! __________________ /Per-Anders (my first name) or P-A as my friends call me

12th September 2007, 01:58 PM	#5
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	79xx and 78xx are quite different if you check the simplied schematics. __________________ /Per-Anders (my first name) or P-A as my friends call me

13th September 2007, 04:13 AM	#7
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	BC550 from ON is not 100% compatible with BC550 from Fairchild. The same goes for these regulators. __________________ /Per-Anders (my first name) or P-A as my friends call me

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12th September 2007, 12:31 PM	#4
consort_ee_um diyAudio Member Join Date: May 2004 Location: Hertfordshire	Also, I found you need !uF of output capacitance to avoid oscillation on the negative regulators whereas you only need 0.1uF with the positive ones.

13th September 2007, 02:57 AM	#6
-_nando-_ diyAudio Member Join Date: Dec 2005 Location: Sao Paulo	I didn't test it with a load, but it have a 100nF cap on it's output. Without load, the regulator from National gives a good voltage regulation, while the ST don't. I didn't test ST with load, as I tested it and after the reading I replaced immediatelly.

18th September 2007, 02:18 AM	#8
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Oscillation???

18th September 2007, 05:35 AM	#9
-_nando-_ diyAudio Member Join Date: Dec 2005 Location: Sao Paulo	No oscilation

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