Converting ShiningBeam 2.8A Boost Drivers To Single Mode

[keith p]

I want to build a 5A SST-50 light. I would like to use a single 26650 cell.

ShiningBeam carries a nice 3-mode 2.8A boost driver for a fair price. I figure 2 of these in parallel would work, but how to eliminate the modes??

I know the MCU (Amtel Tiny13V) must be related to the switching. Here are some pics:

Any hints?

Here is the pinout for the Timy13V:

 

[Slickseth]

Thats not a boost driver. It appears to be using 8 amc7135 chips, (350ma each) for a total of 2800ma. The driver "should" work on a single li-ion, but isn't going to boost the voltage when the input drops below vf of the emitter.

As far as eliminating modes, you should be able to eliminate the mcu altogether, and simply run at the full 2.8a from the eight amc7135 chips. You can desolder and remove the mcu chip. Wire the existing negative lead to your emitter. Bridge the output terminals on all of the amc7135 chips and connect this junction to the positive terminal of your emitter.

... Or... Just by a 1-mode 8 x amc7135 driver. They are easy to find.

 

[keith p]

Thats not a boost driver. It appears to be using 8 amc7135 chips, (350ma each) for a total of 2800ma. The driver "should" work on a single li-ion, but isn't going to boost the voltage when the input drops below vf of the emitter.

As far as eliminating modes, you should be able to eliminate the mcu altogether, and simply run at the full 2.8a from the eight amc7135 chips. You can desolder and remove the mcu chip. Wire the existing negative lead to your emitter. Bridge the output terminals on all of the amc7135 chips and connect this junction to the positive terminal of your emitter.

... Or... Just by a 1-mode 8 x amc7135 driver. They are easy to find.

Now that I think about it, you are correct. It's not boosting.

Your method of eliminating the modes sounds complicated. I thought I could remove or bridge one component to accomplish this. Bridging the outputs sounds messy (at least it would be if I had to do it :green

Can you refer me to a 1-mode driver that is 17MM or smaller? I picked the one Bryan offers due to the fact he is local to me and a great guy to deal with

 

[DM51]

Moving this to the Batteries/Electronics section...

 

[Winx]

Here's 2.8-3.0A driver for one cell.

I don't know how well or bad it works.

 

[Justin Case]

That Suntek board looks like a direct drive, multimode (using an ATMEL IC) controller. No inductor.

Here is a ready-made 2-board, single mode, 8xAMC7135 sandwich driver. A possible issue is that the sandwich is done by putting the two boards bottom face to bottom face. So if you need an exposed anode pad to solder a conical spring contact, this driver may not work out.

If you have two separate 4xAMC7135 driver boards, you can hook them up in parallel to make your own sandwich board.