MAX5942A, MAX5942B IEEE 802.3af Power-Over-Ethernet Interface/PWM Controller For Power Devices

The MAX5942A MAX5942B integrate a complete power IC for powered devices (PD) in a power-over-ethernet (PoE) system. The MAX5942A MAX5942B provide a PD Interface and a compact DC-DC PWM Controller suitable for flyback and forward converters in either isolated or nonisolated designs.
The MAX5942A MAX5942B PD Interface complies with the IEEE" 802.3af standard, providing the PD with a detection signature, a classification signature, and an integrated isolation Switch with programmable inrush current control. These devices also feature power-mode undervoltage lockout (UVLO) with wide hysteresis and power-good status outputs.
The MAX5942A MAX5942B also integrate all the building blocks necessary for implementing DC-DC fixed-frequency isolated power supplies. This device is a current-mode controller with an integrated high startup circuit suitable for isolated telecom/industrial voltage range power supplies. A High-Voltage startup circuit allows the PWM Controller to draw power directly from the 18V to 67V input supply during startup. The switching frequency is internally trimmed to 275kHz 10%, thus reducing magnetics and Filter components. The MAX5942A allows an 85% operating duty cycle and CAN be used to implement flyback converters. The MAX5942B limits the operating duty cycle to less than 50% and CAN be used in single-ended forward converters. The MAX5942A MAX5942B are designed to work with or without an external Diode bridge in front of the PD.
The MAX5942A MAX5942B are available in 16-pin SO packages.
By Maxim Integrated Products
MAX5942A 's PackagesMAX5942A 's pdf datasheet
MAX5942ACSE SOIC
MAX5942AESET SOIC
MAX5942AESE SOIC
MAX5942ACSET SOIC
MAX5942AESE-T SOIC
MAX5942ACSE-T SOIC
MAX5942B




MAX5942A Pinout, Pinouts
MAX5942A pinout,Pin out
This is one package pinout of MAX5942A,If you need more pinouts please download MAX5942A's pdf datasheet.

MAX5942A Application circuits
MAX5942A circuits
This is one application circuit of MAX5942A,If you need more circuits,please download MAX5942A's pdf datasheet.


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