7135 replacement... higher current regulation

8 posts / 0 new
Last post
mattlward
mattlward's picture
Offline
Last seen: 3 hours 22 min ago
Joined: 06/19/2015 - 09:20
Posts: 2714
Location: Illinois, USA
7135 replacement... higher current regulation

Is there a slightly higher current chip with the same form factor as the 7135? Or, is .380 amps the best that can be done with that package?

EDC rotation:
FW1A, LH351D 4000k (second favorite)
FW3A, LH351D 3500k
FW3A, SST20 FD2 4000k
FW3A, Nichia 4000k sw40 r9080 (favorite light!)
FW3A, Cree XP-L Hi 5A3
Emisar D4V2, SST20 4000k
S2+, XM-L2 T6 4C

clientequator
clientequator's picture
Offline
Last seen: 1 month 6 days ago
Joined: 12/05/2018 - 15:42
Posts: 159

there is some i know:

AMC7140 with 700ma http://product.ic114.com/PDF/A/AMC7140_D.pdf
CN5710 with 1 amp http://www.consonance-elec.com/pdf/datasheet/DSE-CN5710.pdf
CN5730 with 1.5 amp http://www.consonance-elec.com/pdf/datasheet/DSE-CN5730.pdf

they are slightly difference size. i think there are some people who ‘stack’ 7135 on top of each other to improve currents flow.

moderator007
moderator007's picture
Online
Last seen: 9 min 40 sec ago
Joined: 12/23/2012 - 04:47
Posts: 3119
Location: North Carolina

Stacking or piggybacking amc7135’s is the way its been done for years. A few times other chips where tried but it’s so easy to just buy loose amc7135’s and stack them that’s pretty much the standard everyone went with. The 105c driver was cheap and programmable with the attiny13. You could scavenge the amc7135 off another donor board or buy them loose at several places. If you want more regulated current just add more amc7135 chips until you reach your goal. There is a limit though. If I remember correctly, the amc7135 has a .2v overhead so as long as the battery loaded voltage is .2v above the led vf at the set current it will remain regulated at that current. Once the battery is below the vf plus the .2v overhaed its running direct drive at what ever the depleting battery can deliver in current at its loaded voltage to the led. Batterys that hold their voltage under high current loads will stay in regulation longer.

mattlward
mattlward's picture
Offline
Last seen: 3 hours 22 min ago
Joined: 06/19/2015 - 09:20
Posts: 2714
Location: Illinois, USA

I am well aware of stacking, have bee guilty of it several times. My eyes and hands are not what they once were. I have an old Shadow light that has a driver that would be difficult to replace if I managed to kill it. I am also thinking about building a 16×7135 driver and would like to get just a little more out of it.

I asked because of the second driver, it needs a board mounted e-switch and with higher current chips I think I could leave a couple off and rig the side switch onto the board.

EDC rotation:
FW1A, LH351D 4000k (second favorite)
FW3A, LH351D 3500k
FW3A, SST20 FD2 4000k
FW3A, Nichia 4000k sw40 r9080 (favorite light!)
FW3A, Cree XP-L Hi 5A3
Emisar D4V2, SST20 4000k
S2+, XM-L2 T6 4C

Mike C
Mike C's picture
Offline
Last seen: 15 hours 17 min ago
Joined: 01/22/2014 - 08:03
Posts: 2358
Location: Sweden

To my knowledge there is no higher current chip that can directly replace a 7135 on an existing driver.

0.38A is not the limit for that package size though, the CN5710 has the same package size and is rated for 1A. It can not directly replace a 7135 though, it has more legs and, more importantly, it’s a high side regulator (7135s are low side).

Henk4U2
Henk4U2's picture
Offline
Last seen: 2 hours 23 min ago
Joined: 02/13/2014 - 17:52
Posts: 2951
Location: The heart of the Netherlands (GMT+1)

How about a LM317T? Just saying.

You are a flashaholic if you are forced to come out of the closet, to make room for more flashlights.

Mike C
Mike C's picture
Offline
Last seen: 15 hours 17 min ago
Joined: 01/22/2014 - 08:03
Posts: 2358
Location: Sweden

Henk4U2 wrote:
How about a LM317T? Just saying.

The OP is asking about a direct replacement for 7135s. Ok, I’ll admit I haven’t bothered checking the LM317T datasheet but I’m quite sure you can’t just remove a 7135, solder on one of these in it’s place and the driver will work as normal except with higher output.
mattlward
mattlward's picture
Offline
Last seen: 3 hours 22 min ago
Joined: 06/19/2015 - 09:20
Posts: 2714
Location: Illinois, USA

I was asking about direct replacements, I figured there were none, at least I could not find any. There are some options, but they require extra components and would be best used in a new design. Thanks for the input.

EDC rotation:
FW1A, LH351D 4000k (second favorite)
FW3A, LH351D 3500k
FW3A, SST20 FD2 4000k
FW3A, Nichia 4000k sw40 r9080 (favorite light!)
FW3A, Cree XP-L Hi 5A3
Emisar D4V2, SST20 4000k
S2+, XM-L2 T6 4C