| Electronics > Beginners |
| A niche chip (LT4320) for mains powered AC -> low volt DC "linear" based psu ? |
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| tszaboo:
Datasheet sais exposed pad must be connected to OUTN. That pad also needs more copper to cool the device down. I dont see the reason to use bent TO220 if you can just use D2PACK mosfets. and more vias for high current. Just increase the copper size, it doesn't cost anything. |
| BravoV:
@digsys, thanks for the update. Btw, are you planning to use gate resistor ? I thought we don't need that according to the datasheet. ??? |
| digsys:
--- Quote from: BravoV ---Btw, are you planning to use gate resistor ? I thought we don't need that according to the datasheet. ??? --- End quote --- Technically, this is a "prototype" layout for me, so I leave the capability of monitor points to test stability etc If everything is fine, I'll probably leave them in anyway, and just use 1R resistors. Checking gate drive capability is important to me, as it will hopefully go in a commercial product. Vin-Vop switching characteristics I can do externally. --- Quote from: NANDBlog ---Datasheet sais exposed pad must be connected to OUTN. That pad also needs more copper to cool the device down. I dont see the reason to use bent TO220 if you can just use D2PACK mosfets. and more vias for high current. Just increase the copper size, it doesn't cost anything. --- End quote --- The posted artwork isn't 100%. The PCB is based on an existing 30A H-Bridge that I made years ago, and works extremely well !! The PCB is 8oz, exposed, with a copper blocks under the TO220s, screwed down hard, which is why I use them. Artic silver cement thermally bonds the crap out of it all. Thanks for your comments. |
| BravoV:
--- Quote from: digsys on October 01, 2013, 04:18:58 am --- --- Quote from: BravoV ---Btw, are you planning to use gate resistor ? I thought we don't need that according to the datasheet. ??? --- End quote --- Technically, this is a "prototype" layout for me, so I leave the capability of monitor points to test stability etc If everything is fine, I'll probably leave them in anyway, and just use 1R resistors. Checking gate drive capability is important to me, as it will hopefully go in a commercial product. Vin-Vop switching characteristics I can do externally. --- End quote --- Ahh .. I see, never thought of that, learn something new and good knowledge today, thank you. :-+ |
| resistor:
So... how did the prototype turn out? |
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