Best way to reverse a LM317 or TIP42C NPN Transistor

cjolly schrieb:

I would like to reverse a LM317 or TIO42C.  I would like to add a

polygon and mount the LM317 on the bottom and use the polygon as a built

on heat sink.  I could save money on adding a heatsink and also make the

board thinner by not having to have the component stand up.  Is this

do-able?  Thanks

Carroll

Reverse it where? in the .sch or .brd?

In schematic use MIRROR, ROTATE or just MOVE and right mouseklick.

Nearly same goes for board except that MIRROR moves the component to the

bottom side of the pcb.

Polygon is no problem as a heatsink. Just draw the form. If you want the

polygon be connected with other signals, gnd i.e., you must give the

polygon the same name. To calculate the polygon area, you use RATSNEST,

but this has to be activated in the options of eagle.

--

Gruß / regards

Joern

Joern Paschedag wrote:

cjolly schrieb:

I would like to reverse a LM317 or TIO42C.  I would like to add a

polygon and mount the LM317 on the bottom and use the polygon as a

built on heat sink.  I could save money on adding a heatsink and also

make the board thinner by not having to have the component stand up. 

Is this do-able?  Thanks

Carroll

Reverse it where? in the .sch or .brd?

In schematic use MIRROR, ROTATE or just MOVE and right mouseklick.

Nearly same goes for board except that MIRROR moves the component to the

bottom side of the pcb.

Polygon is no problem as a heatsink. Just draw the form. If you want the

polygon be connected with other signals, gnd i.e., you must give the

polygon the same name. To calculate the polygon area, you use RATSNEST,

but this has to be activated in the options of eagle.

 

Right now I cant answer for sure since My Eagle is not up and running

thus I can not check my 2 cent but as I understand it you only find the

vertical version and not the horisontal version of the package.

As far as I know there should be an horisontaly version in the library

or atleast an part which is similar in function and uses the same

package but which package is horisontaly.

Use Technology option to change package.

Offcourse there is also always an option to enhance the library.

Breg

Vidar(Z)

     Thank you for your response. Believe it or not, I woke up with the answer.

     Looking at the top of the board, I have the component with the pins on

the left side and the body on the right.  If I flip the component over

vertically as I first thought, it will be on the solder side of the

board, but pins 1 and 3 will be incorrect.  However, if I shift the

traces to the right side and flip the component horizontally

and solder the pins on the trace side, it lines up the way I want it.  I

     know there are a lot of factors invoived, but do you think 1.5

square, 1 ounce copper will be enough of a heat sink for 13.5 volts, .5

amps?

Thanks again.

Carroll

Vidar(Z) wrote:

Joern Paschedag wrote:

cjolly schrieb:

I would like to reverse a LM317 or TIO42C.  I would like to add a

polygon and mount the LM317 on the bottom and use the polygon as a

built on heat sink.  I could save money on adding a heatsink and also

make the board thinner by not having to have the component stand up. 

Is this do-able?  Thanks

Carroll

Reverse it where? in the .sch or .brd?

In schematic use MIRROR, ROTATE or just MOVE and right mouseklick.

Nearly same goes for board except that MIRROR moves the component to

the bottom side of the pcb.

Polygon is no problem as a heatsink. Just draw the form. If you want

the polygon be connected with other signals, gnd i.e., you must give

the polygon the same name. To calculate the polygon area, you use

RATSNEST, but this has to be activated in the options of eagle.

 

 

Right now I cant answer for sure since My Eagle is not up and running

thus I can not check my 2 cent but as I understand it you only find the

vertical version and not the horisontal version of the package.

 

As far as I know there should be an horisontaly version in the library

or atleast an part which is similar in function and uses the same

package but which package is horisontaly.

 

Use Technology option to change package.

 

Offcourse there is also always an option to enhance the library.

 

Breg

Vidar(Z)

On 11/14/2009 10:57 PM, cjolly wrote:

Thank you for your response. Believe it or not, I woke up with the answer.

Looking at the top of the board, I have the component with the pins on

the left side and the body on the right. If I flip the component over

vertically as I first thought, it will be on the solder side of the

board, but pins 1 and 3 will be incorrect. However, if I shift the

traces to the right side and flip the component horizontally

and solder the pins on the trace side, it lines up the way I want it. I

know there are a lot of factors invoived, but do you think 1.5 square, 1

ounce copper will be enough of a heat sink for 13.5 volts, .5 amps?

 

Thanks again.

 

Carroll

Vidar(Z) wrote:

If this is a LM317: is 13.5V the input or output voltage? And if it's

output, what is the input voltage?

Travis

Travis G wrote:

On 11/14/2009 10:57 PM, cjolly wrote:

Thank you for your response. Believe it or not, I woke up with the

answer.

Looking at the top of the board, I have the component with the pins on

the left side and the body on the right. If I flip the component over

vertically as I first thought, it will be on the solder side of the

board, but pins 1 and 3 will be incorrect. However, if I shift the

traces to the right side and flip the component horizontally

and solder the pins on the trace side, it lines up the way I want it. I

know there are a lot of factors invoived, but do you think 1.5 square, 1

ounce copper will be enough of a heat sink for 13.5 volts, .5 amps?

 

Thanks again.

 

Carroll

Vidar(Z) wrote:

 

If this is a LM317: is 13.5V the input or output voltage? And if it's

output, what is the input voltage?

 

Travis

Output, input of 17V

If this is a LM317: is 13.5V the input or output voltage? And if it's

output, what is the input voltage?

 

Travis

Output, input of 17V

PCB copper area needed to keep the part at or below 100degC under

natural convection is about 26cm^2.

Travis

Travis G wrote:

If this is a LM317: is 13.5V the input or output voltage? And if it's

output, what is the input voltage?

 

Travis

Output, input of 17V

 

PCB copper area needed to keep the part at or below 100degC under

natural convection is about 26cm^2.

 

Travis

Thank you.  I'll give it a shot.