Regulator IC Data - LAS19U - diyAudio
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Old 20th May 2003, 09:23 PM   #1
JDeV is offline JDeV  South Africa
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Default Regulator IC Data - LAS19U

Can anybody help me with data on this IC:

It is a LAS19U , type of adjustable voltage regulator I think. (From Lambda??)
Is in a TO-3 package with 4 legs.
I want to use it for such a purpose, if possible, but will need some data on the pin-outs and voltage + current specs.

Thanx
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Old 21st May 2003, 08:51 AM   #2
Netlist is offline Netlist  Belgium
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LAS19U: +4..+30V, 5A, 50W(Tc=90), -55..+135

LAS19U = UA78HGKC
The Lambda company is no more, but the LAS19U has been manufactured by Unitrode corporation as well, which is now a part of Texas Instruments.
On the TI website however, there is no findable data on LAS19U.
Also no data for the UA78HGCK.

/Hugo - the best he could find..
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Old 21st May 2003, 07:11 PM   #3
JDeV is offline JDeV  South Africa
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Quote:
Originally posted by Netlist
LAS19U: +4..+30V, 5A, 50W(Tc=90), -55..+135

LAS19U = UA78HGKC
The Lambda company is no more, but the LAS19U has been manufactured by Unitrode corporation as well, which is now a part of Texas Instruments.
On the TI website however, there is no findable data on LAS19U.
Also no data for the UA78HGCK.

/Hugo - the best he could find..
Thanx for the info.
Are there any safe way of determining which pin does what?
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Old 21st May 2003, 07:26 PM   #4
Netlist is offline Netlist  Belgium
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What I would try is the following:
Apply VERY little current and voltage (4V) with regulated PSU to different pins. Measure the other pins behaviour. Keep an eye on the ampere meter. Case will be ground or output.
I know this is not the conventional way to go, but I only tell you how I would try. Other people will be able to tell you which ohmic values you can expect between different pins.

/Hugo
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Old 21st May 2003, 07:37 PM   #5
JDeV is offline JDeV  South Africa
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What could be a possible use for the 4th pin?
Normally you got a: (LM338 for example)
1)Adjust
2)Vin
3)Vout - case

or similiar alocations.
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Old 21st May 2003, 07:45 PM   #6
Netlist is offline Netlist  Belgium
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No idea, but take a look at this:
http://www.cygnal.co.kr/KA78R33.pdf

/Hugo
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Old 21st May 2003, 08:07 PM   #7
moamps is offline moamps  Croatia
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Hi,

maybe this unfocused picture can help.

Regards
Attached Images
File Type: jpg 78g.jpg (27.8 KB, 105 views)
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Old 21st May 2003, 08:13 PM   #8
Netlist is offline Netlist  Belgium
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Quote:
Originally posted by moamps
Hi,

maybe this unfocused picture can help.

Regards
Well, there you go JDeV, forget post #4

/Hugo - moamps rules!!
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Old 24th May 2003, 09:59 AM   #9
JDeV is offline JDeV  South Africa
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Default Found it

Thanx for all other info supplied.

For others who might need it someday:

Here is the origenal datasheets.
File 1 of 2:
Attached Files
File Type: zip las19u.zip (70.7 KB, 42 views)
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Old 24th May 2003, 10:01 AM   #10
JDeV is offline JDeV  South Africa
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Default File 2

File 2 of 2:
Attached Files
File Type: zip las19u1.zip (73.9 KB, 29 views)
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