DC-DC converter issue
DC-DC converter issue
(OP)
A few days ago, the MOSFET (an IRF1407) blew. I saw its temperature was up near 260 F. Oops. It was driving a home-made transformer (a toroid inductor with another wind for the secondary) that has a resistance of .005 ohms, while the IRF1407 has a RDS(on) of .0078. The question I have is, did the MOSFET overheat because its RDS(on) is higher than that of the coil? And if so, if another device is used (probably 4 IRF2804's paralelled) would the low RDS(on) of the MOSFETS improve efficiency and halt future MOSFET burn-ups?





RE: DC-DC converter issue
Did you give it enough drive to turn it on fully?
Remember that the gate has considerable capacitance and the miller effect will make it even more considerable during switching.
Dedicated gate drivers can source/sink up to an amp to give speedy turn on/turn off.
What's your heatsinking like?
You can parallel as many fets as you like but it probly won't get any better unless you address the gate charge/discharge.
RE: DC-DC converter issue
RE: DC-DC converter issue
Thank You,
JJMI
RE: DC-DC converter issue
Thanks again,
JJMI