someone made cool heat sink for ic stack ?

V

voidptr

Member

• Oct 16, 2012

• #1

Ok ,

I got this motor shield, with flimsy L293D hbridge p
I'm planning to stack 2 L293D together to have more current, it should works fine ...

But I also want to include some kind of heat sink in the stack,
anyone here did this before and came with cool nice designs ? ;-)

I have few chunks of black anodized aluminum that I plan to use for that .

 

ronv

Well-Known Member

Most Helpful Member

• Oct 16, 2012

• #2

Haven't tried it, but how about glueing some of your aluminum to the bottom of each IC in between the legs with some thermal epoxy. It could extend about 1/2 inch beyond each IC.

 

audioguru

Well-Known Member

Most Helpful Member

• Oct 16, 2012

• #3

An L293 IC is a low current device that is not designed to use a heatsink.

Use an L298 instead that has double the current capability and has a metal tab that can be bolted to a heatsink.

 

ronv

Well-Known Member

Most Helpful Member

• Oct 16, 2012

• #4

There is a picture and some info on heatsinking them here if you don't want to buy the bigger one.

https://www.electro-tech-online.com/custompdfs/2012/10/l293d.pdf

 

audioguru

Well-Known Member

Most Helpful Member

• Oct 16, 2012

• #5

An L293 with a glued-on "heatsink" made from the side of a tin can?
Instead use an L298 with a bolted-on real heatsink.

 

dr pepper

Well-Known Member

Most Helpful Member

• Oct 16, 2012

• #6

You can buy sinks designed for dil devices, farnell comps do, or used to do them.

 

4pyros

Well-Known Member

Most Helpful Member

• Oct 17, 2012

• #7

Yes you can use heat sinks or just stack more chips.
For heat sinks just solder some copper wire to the center ground pins.
Use sn754410 for higher currents than the l293d.
Look hear;
http://letsmakerobots.com/node/26101

 

4pyros

Well-Known Member

Most Helpful Member

• Oct 17, 2012

• #8

Instead use an L298 with a bolted-on real heatsink.

Click to expand...

He would need a hole new board to use those.

 

Last edited: Oct 17, 2012

V

voidptr

Member

• Oct 18, 2012

• #9

Thanks all

Has I said it is a arduino motor shield already made, so i have to stick with what is already on the board, so just stacking another L293d will give just the safety current I need in case I got a motor stall, and the heat shink was just in case they come hot a little bit.

so after few toughts, i was heading for some sortof 2 pieces of aluminum glue on top on each ic, but after rereading the datasheet Iwill probably go for some sortof 2 mounted pieces on the ground pins each side, who should give me better heat transfert ... i dont think they gonna be very hot anyway ...

 

4pyros

Well-Known Member

Most Helpful Member

• Nov 15, 2012

• #10

but after rereading the datasheet Iwill probably go for some sortof 2 mounted pieces on the ground pins each side, who should give me better heat transfert

Click to expand...

Yes thats what I would do, the pins are made to dissipate the heat.