About FET drivers (East-092, A17DD-L FET+1, etc), higher voltages, and more

Flashlight Modding and DIY Parts
1

Hello!

I've recently stumbled with this 1* Lithium 5-Mode 2.4A LED Flashlight Driver (good East-092? Dodgy version: 3.7V~5V 5-Mode LED Flashlight Direct-Drive Driver Circuit (East-092)). Cheap (good?) FET driver.

Of course, also the not so cheap homebrew A17DD-L FET+1.

Well, now if we add to the equation both 2-in-series emitters (like XHPs) and 2-in-series li-ions, how this would fare? Should work well at least with a couple of the newer 26350s, isn't it? And what about the all the rage LiitoKala 26650-50As? Should we start to think in watercooling setups for leds? LOL!

Cheers ^:)

2

I'd rather go with the FET + 7135 Driver, you get what you pay for

3

With a top end of 5V they may not survive 2-cell input.

4

Looks to be the same as the A17DD-L FET+1 I linked above (should I say BLF17DD-L FET+1? ).

I think that “top end” voltage is presumed because of the impedance sensitive input/output delta voltage constraints inherent to FET drivers.

Would the logic chips on these boards fry at the higher voltage? All of the other components should do fine, doesn't them?

Cheers ^:)

5

Attiny 13A max’s out at 6V. I don’t know about other mcu’s. To handle two cell input they need a Zener diode voltage shunt or a low drop out voltage regulator.

6

You think they look the same?

Maybe you should look closer, look a lot closer

7

According to RMM with the fet +1 drivers the single 7135 doesn’t handle the extra voltage of a zener mod and burns up over time if used for anything but moon mode.