Power Management

Documents PoE Controllers

Documents

PoE Controllers

PoE Controllers

This section contains FAQs and documentation for PoE Controllers products.

Browse the product pages below for specific information.

Created 5 months ago

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How is the secondary synchronous MOSFET driven in the MAX5969AEVKIT?

In this EVKIT the transformer’s secondary winding is used directly to drive the synchronous secondary side mosfet. This topology is called self-driven. It is a simple technique, however, transformer leakage…
If Sleep mode is not using, could I leave SL and LED pin floating?

No. MAX5995B has automatic MPS function,. It needs setting the current via resistor on SL pin (connect across SL pin and GND). As for LED pin, it needs connect to GND to sink the current at least.
In MAX5995C circuit design, for AutoClass function, to further reduce the power consumption, can we connect AUC to Vss to select 5% duty cycle only?

Not every PSE can support such lower duty cycle( 5% ). For better PSE compatibility, we provide different options by connecting a resistor (no worse than 1% accuracy) between AUC and VSS to program the…
MAX5969A Powered Device Interface Controller Classification with no Classification resistor

Question: If I don’t have a resistor on the Rcls pin, the circuit still operates but I don’t know what Classification is presented to the PSE? Answer: When the PSE detects a connected PD, it will send…
MAX5969AETB+: FAQ

MAX5969AETB+: FAQ
MAX5995B: FAQ

MAX5995B: FAQ
MAX5995BATE+: FAQ

MAX5995BATE+: FAQ
Why does the MAX5995B on the MAXREFDES1266 consume 13mA even at light loads?

The high quiescent current is associated with the LED pin sourcing current to ground directly. When the LED pin is connected to ground, it can lead to higher than normal current draw. The pins nWK and…