BLF17DD Info Thread - Reference

I think “R” denotes the decimal point so R100 is .1 ohm. You need 100R. In reality though, that resistor was placed as a quick fix for a voltage spike issue that was corrected by moving C1 I think.

Answering your other question: yes, two 200 ohm resistors in parallel gives you the equivalent resistance as a single 100 ohm.

Thanks you both for your quick answer!!

Anyone has tried the 70N03 FET on BLF17DD?
Also is the FET on the ld-25 driver 70N03? Planning to get that FET from ld25 and transfer it to blf17dd but i want to make sure it’s really 70N03 and will work on blf17dd.

The Vishay 70N03 is what we used when it was available. The current trend is to a different package in part due to availability.

Oops! My memory strikes again. We used the 70N02.

Edit again, the 02 is a better choice but the 03 will still work well. At the voltage we use you probably couldn’t tell a difference from what I can tell by the respective datasheets. You might hold out for a more edumicated opinion though.

I bought a couple of blf17dd drivers from mtn.electronics last year. I want to use one now with a side switch but from what I’m reading I need the right firmware. How can I check if I have the right firmware for that without busting it?

Can you go into your order history to see what firmware is on them?

You won’t fry anything if you hook it up & bench test by grounding pin 2 to see if it changes modes.

I tried looking through my emails but I think I deleted it. So if it won’t fry anything I’ll try what you suggested, thanks.

Some firmwares were set to use pin 3 instead of pin 2 - so try both whilst you are at it.

Probably easier to just add/remove/add power to the driver on the test bench; if it changes mode, it’s not an e-switch f/ware.

I just tried powering on and off and it seems I have firmware for a clicky. Is there anyway to change this?

Only by re-flashing with the appropriate f/ware.

I’m set up to do it, but I think it would cost you more in postage to send it to me than it would cost to get another one from RMM, or even to get the gear to program it yourself.

see;

or

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)