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Partname: | MAX5942BESE+T |
Description: | IEEE 802.3af Power-Over-Ethernet Interface/PWM Controller for Power Devices. Lead-free |
Manufacturer: | Maxim Integrated Products |
Datasheet: | PDF (612K). Click here to download *) |
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 powergood status outputs. The MAX5942A/MAX5942B also integrate all the building blocks necessary for implementing DC-DC fixedfrequency 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 MAX59412A 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. |
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Click here to download MAX5942BESE+T Datasheet*) |
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