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Buck LED driver..high side FET drive with pulse transformer or isolated high side supply

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Flyback

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Hello,

We are designing a 30W Buck LED driver, Vin = 400V, VLED = 260V.
We are using a Buck converter with a high-side NFET. (as in the attached schematic and also the LTspice simulation.)
Rather than use a gate drive transformer to drive the high side NFET, we are going to use an NXJ1S1212MC isolated DCDC power module to provide a high-side bias supply, from which the high side NFET can be driven (via a digital isolator)

NXJ1S1212MC isolated DCDC power module (vin=12v, vout = 12v)
http://www.farnell.com/datasheets/2...09.1106301863.1511695680-287702491.1506211291

…the only reason for doing this, ..is because we are already using the NXJ1S1212MC isolated DCDC power module in another one of our products (for a completely different application).
The problem will come if this DCDC module goes obsolete. There are others available, but none have the advantageously low isolation capacitance that the NXJ1S1212MC has.

What do you think are the chances of the NXJ1S1212MC going obsolete in the next 5 years?
 

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Flyback

Well-Known Member
Thanks, We are too small and we cant gaurantee large volume sales...they wont be interested...we ask many co's stuff and they never answer....the only one who speaks to us is we-online.com.....thats because we actually do ship their stuff in pretty high volume....but they dont stock gate drive transformers with low enough leakage for this app.....so we going to use the isolated dcdc module.
 

jpanhalt

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Most Helpful Member
I don't think anyone but the manufacturer has an idea about a product's life. The manufacturer might not even have a clue either. Who would have predicted the 555 would last forever?

As an alternative, use a distributor that will send a notice for "last-time buy." DigiKey and probably many others do that. Unless the product is DC'd almost immediately, your company should have a good idea of potential sales and the amount of inventory needed to support the product for whatever time will be needed after that last-time buy.
 
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