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For second source MOSFETs, consider the Fairchild IRFM120A, FDT3612, FDMC3612, FDMC86102 . These have been used in IEEE802.3at Type 2 applications with previous generation ADI/LTC PSE…
May be the LTC4279 (DEMO MANUAL DC2541A) with a Boost DC/DC Converter Power Supply (24V to 55V/57V) may be the best choice ??
Check out LTC4279, Single Port PoE/PoE+/LTPoE++ PSE Controller. DC2541A supports up to 90W LTPoE++ PDs.
Hi, i have design an Injector with LTC4279.
The Main Supply is Isolated From Netz with normal and regular Toroidal Transformer.
While the secondary DC/DC converter for have the 55 V Out for Injector Type1, Type2, LTPoE++...., isn't isolated, it's a normal…