Looking for a low current driver

stivo

Newly Enlightened
Joined
Mar 11, 2012
Messages
3
Hi!
I am building my own cave light and have problem to find circuit board for xp-g led emitter. I don't need those 1A driver, beacause the light output i want must be somewhere between 50 and 200 lumens. The best would be a 3 mode driver (min 50mA, med 100~200mA, max ~600mA).
Thanks for any help.
 

moderator007

Enlightened
Joined
Jan 1, 2010
Messages
990
We would need to know the power source (voltage range) in order to recommend an appropriate driver.
+1
Can't really recommend any thing with out knowing your battery setup. Just guessing there's not a 110v outlet in the cave.
 

dsche

Newly Enlightened
Joined
Dec 4, 2009
Messages
161
Location
Perm, Ural
For 3-4.2 V input I've make very simple linear on 7123

It's produce 20 and 120mA

driver.jpg


schemeW.png
 
Last edited:

stivo

Newly Enlightened
Joined
Mar 11, 2012
Messages
3
+1
Can't really recommend any thing with out knowing your battery setup. Just guessing there's not a 110v outlet in the cave.

You're right, i'm not gona use 110V outlet, my choice is 2x18650 in parallel, thats 3.7V output.

dsche,
is there any tutorial, how to make something like you did?
 
Last edited:

moderator007

Enlightened
Joined
Jan 1, 2010
Messages
990
You could use a shiningbeam amc7135 based driver sku# 1218. Simply remove by unsoldering 2 of the amc7135's. There is four now so removing 2 would give you 700ma max output with three modes. Operates from a li-ion voltage decently. Very robust driver.
 

hank

Flashlight Enthusiast
Joined
Apr 12, 2001
Messages
1,558
Location
Berkeley CA
I think I recall someone , somewhere, pointing out you don't need to desolder 2 of the chips, just cut one pin on each of them. But I forget where , or which pin. Less messy than desoldering though.
 

stivo

Newly Enlightened
Joined
Mar 11, 2012
Messages
3
You could use a shiningbeam amc7135 based driver sku# 1218. Simply remove by unsoldering 2 of the amc7135's. There is four now so removing 2 would give you 700ma max output with three modes. Operates from a li-ion voltage decently. Very robust driver.

If i remove two amc7135, what would be amperage output in low and medium mod? Will it drop to 30 and 220mA, or will it stay the same as before, so I'll get 60,440 and 700mA?
 

LilKevin715

Enlightened
Joined
May 25, 2010
Messages
712
Location
San Diego, CA USA
The 3-mode AMC7135 drivers that are sold at SB's website are programmed for 5/30/100% (Atmel 1002 Tiny13A controls the PWM output). So if you remove two 7135 chips the resulting output level would be approximately 35/210/700ma.
 

Latest posts

Top