Texas Instruments TPS23755 PoE DC-DC Controllers

The DC-DC controller features a PSR that uses feedback from an auxiliary winding to control the output voltage, eliminating the need for an external shunt regulator and an optocoupler. The device is optimized for operation with a secondary side diode rectifier (typically 12V output or higher). Typically, the converter operates in continuous conduction mode (CCM) at a switching frequency of 250kHz.

The Texas Instruments TPS23755 DC-DC Controllers provide an SFFD and slew rate control, helping minimize the size and cost of the EMI filter. The Advanced Startup allows the use of a minimal bias capacitor while simplifying converter startup and hiccup design. The secondary auxiliary power detect capability provides priority for a secondary side power adapter while ensuring a smooth transition to and from PoE input power with no efficiency or thermal trade-off. Additional features for the TPS23755 include an internal soft-start, slope compensation, and blanking.