Author Topic: EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial  (Read 14915 times)

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Offline madhunm

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Re: EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial
« Reply #25 on: March 08, 2013, 08:44:00 pm »
All,

The file I linked to has an ATMEGA164 and not either the ATMEGA324 or ATMEGA644.

thanks,
Madhu.
 

Offline konfu

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Re: EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial
« Reply #26 on: March 09, 2013, 12:16:13 am »
I guess it's just the device name that's wrong. Still that little thing's got 44 pins so it's most probably the mega644 dave mentioned.

 

Offline EEVblog

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Re: EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial
« Reply #27 on: March 09, 2013, 05:31:57 am »
I guess it's just the device name that's wrong. Still that little thing's got 44 pins so it's most probably the mega644 dave mentioned.

It's the 164A, as per the schematic.

Dave.
 

Offline SteveyG

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Re: EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial
« Reply #28 on: March 09, 2013, 09:54:31 pm »
Seems a bit like a copy of Mike's video ages ago only not done quite right  :-\  The flux definitely wasn't to blame in the first attempt, expecting all of the solder to wick through the vias is asking for trouble IMO. You would have been better off using a bit of paste or applying a small amount of solder to the top side of the PCB.

I use flux paste and the flux pens and IMO, the paste is a lot better to work with.

Offline T4P

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Re: EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial
« Reply #29 on: March 10, 2013, 10:38:36 pm »
Seems a bit like a copy of Mike's video ages ago only not done quite right  :-\ 
Dave does as he likes  :P
 

Offline tomtomtomtom

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Re: EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial
« Reply #30 on: March 11, 2013, 01:00:31 pm »
have the two power supply projects merged into one now?
 

Offline EEVblog

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Re: EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial
« Reply #31 on: March 11, 2013, 01:25:40 pm »
The flux definitely wasn't to blame in the first attempt

Correct, it wasn't. It was me, I thought I saw the chip self-center (indicating proper solder attachment) but I was mistaken, hence I removed the heat too early.

Quote
, expecting all of the solder to wick through the vias is asking for trouble IMO.

No, it's not. If there is enough surface tension under the chip from the solder to self-center the chip, then it's gotten through properly and will be a good connection.

Quote
You would have been better off using a bit of paste or applying a small amount of solder to the top side of the PCB.

The whole point of the video was to show how to do it without flux (not everyone keeps flux in their fridge), and if you are relying on the thermal conductivity through the die and up through the bond wires and down the pins and then onto the pads to get a good reflow solder connection on your pads, then you are doing it wrong. Hence my two-step technique of thermal pad first, then traditional drag soldering.

You can argue about whether to tin the pad first until the cows come home. Personal preference. I showed that extra step is not required.

Dave.
 

Offline EEVblog

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Re: EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial
« Reply #32 on: March 11, 2013, 01:26:58 pm »
have the two power supply projects merged into one now?

Kinda, but no.
The bench one will be a higher power (and more feature rich) version of the "USB" one.
The USB one adopted the battery concept from the bench one.

Dave.
 

Offline konfu

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Re: EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial
« Reply #33 on: March 11, 2013, 02:59:24 pm »
Hi,

what bench top version? Did we miss it?

I am working on a bench-top power supply inspired by Dave's battery powered one. 36V, 4A max. So around 140 Watts.

I was thinking of putting together a few posts around it but if there is something already in development by Dave - why should I bother? Anyone interested in opening a new forum topic to discuss it?
 

Offline EEVblog

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Re: EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial
« Reply #34 on: March 12, 2013, 03:26:39 am »
Seems a bit like a copy of Mike's video ages ago only not done quite right  :-\

It's not a copy of Mike's video.
Mike's video is a more brutal approach that is really only relevant to the QFN that he reflowed (because of the non accessible pins). It would not be the best approach for the TSSOP I used where the pins are accessible, for the reason I mentioned in the previous post.

Dave.
 

Offline ilanko

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Re: EEVblog #434 - SMD Thermal Pad & Drag Soldering Tutorial
« Reply #35 on: October 27, 2013, 03:23:59 am »
Grate example of soldering work. Right on Dave.
 


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