FS: Jibs Linear Drivers

[jib77]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

BTW I found a promising boost chip that can theoretically go up to 3.5A!
Im currently working on layout for a prototype ... if all goes well it will be a sub $20 driver. The only drawback is this will not be a continuous ground driver, so it can not be used for any diodes that have a common node with its case(like reds).

 

[SpyderFire]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

What is an example of a "IMR/LowR Cell" ?

 

[jib77]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

What is an example of a "IMR/LowR Cell" ?

Low resistance cells. Because they have very low internal resistance they can supply the current necessary to drive these high current builds.

LarryDFW's 18650's are LowR cells, AW IMR: http://www.lighthound.com/AW-IMR18650-1600mAh-LiMN-rechargeable-lithium-battery_p_2797.html, My favorite: http://leddna.com/imr26650-limn-lithium-38v-4000mah-rechargable-battery_p303.html.

 

[steviedezie]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

Hey Jibs, if you had the choice to only heatsink 1 side of the driver, which side should be heatsinked?

 

[bhwollen]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

My guess is the resistor side steve.

 

[xivlia]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

i think the regulator side..the resistors doesnt seem to get too hot with my custom made driver..but the regulator is almost impossible to touch due to heat.

 

[jib77]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

Resistor side because the copper under the resistors act as the thermal tab for the regulator (just like the metal tab on a TO-220 LM317). I like to push the thermal adhesive into the spaces between and around the resistors.

 

[bhwollen]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

I was right! lol

But in my experience these don't even need heatsinking...

 

[xivlia]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

hmmm. thats weird. my regulator gets very very hot. a tiny thin peice of copper wont cool it down at all in my experiance. maybe because mine is a voltage regulator thats why oh well never mind

 

[jib77]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

hmmm. thats weird. my regulator gets very very hot. a tiny thin peice of copper wont cool it down at all in my experiance. maybe because mine is a voltage regulator thats why oh well never mind

Well its two pieces of copper, one over most of the top layer and another over most of the bottom layer tied together with a bunch of vias. This is a decent amount of mass and surface area for the heat to dissipate from the chip.

 

[xivlia]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

ahh, that makes better sense

 

[steviedezie]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

ok got it. Thanks for all the input. I have no idea how the internal copper traces work in your driver. Now it all makes sense... Im hoping to get unlimited duty cycle with a guidesman 2 host + driver heatsink.

 

[xivlia]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

untill the batteries run out

 

[jib77]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

BTW I found a promising boost chip that can theoretically go up to 3.5A!
Im currently working on layout for a prototype ... if all goes well it will be a sub $20 driver. The only drawback is this will not be a continuous ground driver, so it can not be used for any diodes that have a common node with its case(like reds).

Layout complete: :san:

 

[bluuray]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

niiiiiiceee

 

[LaZeRz]

Re: FS: Jibs Linear Drivers - 500mA, 1.3-1.6A, 1.8A

Just wanna say Thanks Rick! i finally got around to finishing my LOC hotlight, i've been walking around the house smoking crap

+2

gonna post a little tut thingy but the problem is people will ahve to bear with my recently wrecked sony camera, the focus is messed up....

LOL BHWOLLEN... 1000+ posts already