BLF17DD Info Thread - Reference

Oookay, new driver it is. Thanks FmC

Would this work?

2 pounds for a mosfet? Great! :slight_smile:

On Resistance Rds(on):0.0059ohm vs 4mOms

anyone has some close up shots of these BLF17DD populated?

I ordered a Parts-Set from mtnelectronics, but I have more parts than the one in the first post of this thread.

also, mtnelectronics is offline for the moment, so I can`t see any of his pictures.

Here's some variety shots - think the BLF17DD current version is included:

Thanks a lot!

the top 3 look like mine.

now double checking all the parts.

Is C1 and on the opposite side number #4 the same thing?

I have 2 of them... 1 came in a black packaging, and the other in white with a red pen mark.

edit: my short memory wasnt working well... 1 came in white tape, the other in transparent tape

If you got a capacitor in black packaging it wasn't from me. The small capacitor goes on the MCU side and the large one goes on C1. Should have been one in clear tape (the big one) and another in paper tape (the small one).

Oops, looks better:

"C1" is the common cap of 10UF on all Nanjg's, while #4 is the OTC cap - lower value. You need OTC support in your firmware to take advantage of it. I like the "noinit" firmware versions floating around which makes the OTC cap unnecessary by using the "brown out" detection capability of the MCU.

you`re correct... even my short memory didnt work.

I have 1 in transparent package,and 1 in white... the transparent has a red pen mark.

(I see you call it tape,I wasnt sure what to call it)

Thanks guys!

Nice shots Tom E let alone drivers. I admire your abilities.

Thanx! Not bad for a reflow station that consists of a coffee mug warmer and an embossing heat gun Smile.

I bought a similar embossing gun to yours when you first posted about it and have not looked back reflowing leds. I'll have to post up a picture later how its set up. How do you use yours?

Smile It's not my idea btw... A friend of mine set me up with this stuff - he's an EE by trade, but sort of software engineer/super hobbyist - rockets, RC's, ham radios, etc. He's like a lot of us - just a big kid play'n with his toys Smile.

What I do is get my mug warmer up to temp, sit the board with the solder paste and parts on there for like a minute to warm up, then go over it carefully, but keep the hot air gun moving, usually pretty close, an inch or two. The paste goes thru cycles - watery first, then dries out and hardens bit, then some bubbling and smoke is a good sign you are getting close, then finally we get liquid metal...

Usually things go well, but sometimes I get parts float'n around, blown off, and even had caps stand up on one end?? Weird things can happen...

That's called a "tombstoned" part. That happens when one pad heats up a lot faster than the other, like when you have a large ground plane on one side of the component and a thin trace on the other, and you haven't given time for the board's temperature to equalize. Pre-heating or heating more evenly across the entire board instead of focusing on a particular component generally eliminates this.

For the BLF17DD driver: whats the most suitable mosfet atm, as long as 70N02 isnt awailable anymore and Digikey EU shipping fee is 55$- anybody from Europe found a suitable solution?

Actualy there are Aliexpress offers for 70N02 and AOD510 but i aint sure in their quality

What do you think of this one

Sorry can't help - no clue there. I still have a few original 70N02's I'm using up slowly, though I've pretty much transitioned now to wight's A17HYBRID-S board, using the SIR800P FET - great design for it's low profile, single sided parts, high performance, and ability to run a single 7135 for low modes. Right now I'm using 5 modes with the first 3 out of the 7135 at PWM values of 4 (or 5), 30, and 255.

Mostly I consider this board obsoleted, but there still can be applications. Richard knows a whole lot more about this stuff, but he sells these FET's, and I would think they are excellent - his research for these was intense:

http://www.mtnelectronics.com/index.php?route=product/product&path=25&product_id=213

If you can't order them directly from Richard (shipping costs, etc.), I'd check for Euro sources of this exact part.

Tom, you mean 17mm DD+single-7135 driver ? Can it be controlled via an el switch? Thats the main reason i wanted to try this driver out

Well, i will test that MOSFET anyway, ordered a sample already

Yes, this: https://budgetlightforum.com/t/-/31102

I've built a couple with my custom e-switch firmware, based on the latest version from JohnnyC, STAR_Momentary (http://bazaar.launchpad.net/~toykeeper/flashlight-firmware/trunk/files/head:/JonnyC/STAR/STAR_momentary/). It has full support for the two PWM outputs. Recently modded a UF F35 e-switch light, a Yezl Y3, and now I'm working on a ZY-T11 clone. I got amazing #'s on the F35 and Y3 in a neutral tint, so expecting the same for the very pocketable ZY-T11 clone - it will have a MaxToch 25mm MCPCB screwed down, 20 AWG wires with the LED+ direct connected to the spring from the LED via holes drilled thru the stock driver (stripped) and hole drilled thru the LED+ pad on the HYBRID board. The ZY-T11 clones from BangGood is a great deal for what you getting, and really nice mod host. Like the lockout feature of the anodized thread tailcap, very compact size, nice size reflector for some throw, can take a big MCPCB, excellent reflector for wire soldering clearances, etc. The quality of the anodizing is fair (not good) and you play the lottery on what condition it will be in, but I lucked out on the 3 I've gotten.

I was sniffing around a bit and found Farnell:
http://bg.farnell.com/international-rectifier/irlr8721pbf/mosfet-n-d-pak/dp/1551907?ost=70N02&rpsku=STD70N02L

They seem to be shipping to many countries. And then there are also Mouser and Digikey. Those I think are the big international ones in electronics, from the west at least.