J
jtech
Guest
Does any1 have a pinout/spec for an la7612 IC. My book skips it, and i cant
find it. Thanks
find it. Thanks
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Neil Fisk
Guest
wait.............maybe because it's a LM7812.................it's the one,
try onsemi.com for a sample. I can help you out
if you look at the front with the part number then the first leg to the left
is + Vin, and the middle leg is Ground(Gnd), and the right leg is +Vout.
The metal tab with the hole in it is GND as well
These devices require that the input voltage be 2 volts higher then the
output, so in your case 14 volts minimum, if you need more current then use
a T0-220 heat sink for current up to 1.5 amps depending on the part number,
refer to the data sheet. Your going need a filter cap mounted near the
input, and it can vary in size try 220uF first then increase if you need to.
If you find that the regulation begins to drift slighly, then increase the
value to 330uf and so on.
On the output pin you can just use a 0.1uf cap, and add a 1uf to 10uf cap
if you need to, it all depends what your application requires. If it's more
than 500ma then use the 0.1uf and 10uf cap together in parallel on the
output, and mount regulator with the heat sink.
Refer to John D. links book on "DC Power Supplies" it's a good place to
start, if you need answers .......OK.
Neil W.Fisk
try onsemi.com for a sample. I can help you out
if you look at the front with the part number then the first leg to the left
is + Vin, and the middle leg is Ground(Gnd), and the right leg is +Vout.
The metal tab with the hole in it is GND as well
These devices require that the input voltage be 2 volts higher then the
output, so in your case 14 volts minimum, if you need more current then use
a T0-220 heat sink for current up to 1.5 amps depending on the part number,
refer to the data sheet. Your going need a filter cap mounted near the
input, and it can vary in size try 220uF first then increase if you need to.
If you find that the regulation begins to drift slighly, then increase the
value to 330uf and so on.
On the output pin you can just use a 0.1uf cap, and add a 1uf to 10uf cap
if you need to, it all depends what your application requires. If it's more
than 500ma then use the 0.1uf and 10uf cap together in parallel on the
output, and mount regulator with the heat sink.
Refer to John D. links book on "DC Power Supplies" it's a good place to
start, if you need answers .......OK.
Neil W.Fisk
J
jtech
Guest
"Neil Fisk" <nfisk@telus.net> wrote in message
news:CQLcc.17879$J56.802@edtnps89...
news:CQLcc.17879$J56.802@edtnps89...
anywayswait.............maybe because it's a LM7812.................it's the one,
try onsemi.com for a sample. I can help you out
if you look at the front with the part number then the first leg to the
left
is + Vin, and the middle leg is Ground(Gnd), and the right leg is +Vout.
The metal tab with the hole in it is GND as well
These devices require that the input voltage be 2 volts higher then the
output, so in your case 14 volts minimum, if you need more current then
use
a T0-220 heat sink for current up to 1.5 amps depending on the part
number,
refer to the data sheet. Your going need a filter cap mounted near the
input, and it can vary in size try 220uF first then increase if you need
to.
If you find that the regulation begins to drift slighly, then increase the
value to 330uf and so on.
On the output pin you can just use a 0.1uf cap, and add a 1uf to 10uf cap
if you need to, it all depends what your application requires. If it's
more
than 500ma then use the 0.1uf and 10uf cap together in parallel on the
output, and mount regulator with the heat sink.
Refer to John D. links book on "DC Power Supplies" it's a good place to
start, if you need answers .......OK.
Neil W.Fisk
its a big say 32 pin ic chip in an rca tv. not a simple regulator. Thanks