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For simplicity, I would use a part specified with an Rds on for a Vgs of 4.
Email Required, but never shown. MichaelKaras Thanks for pointing this out! Sign up using Facebook. The LEDs are rated at 3.
IRFD Vishay, IRFD Datasheet
JonasWielicki – Yes, that looks like a robust solution. You’ll need to re-consider your RDSon calculations.
From the datasheet, I think it should be fine to use: JonasWielicki – It’s simpler and ‘safer’ to use a device rated for the gate-voltage available. Is there plenty of space?
This is a one-off design, and for assembly simplicity we would prefer through-hole and not SMT devices. Sign up using Email and Password. Have we overlooked anything? No, there is no strong reason for that part.
Typically the datasheet is much simpler to interpret. There are quite a few parts which are specifically rated at 4.
If through-hole is important, it might be easier to get a physically larger package, like an IPAK. If this is a one off, or small volume system, I would make a ‘no-brain’ assumption, to make life easier, and, at least, double the required current to get a minimum device current.
(PDF) IRFD014 Datasheet download
Home Questions Tags Users Unanswered. Do we have to expect any problems when driving the gate with less than that? We have no fast switching requirements. I went through a list of commonly used parts and picked a non-SMT part which seemed to meet the specifications.
That might be a way to make an SMD device usable within a through-hole technology design. Sign up or log in Sign up using Google. For small volumes the difference in part cost is likely a small fraction of an hour of my time.
I’d recommend using a device with lots of headroom.