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http://www.ti.com/general/docs/suppproductinfo.tsp?distId=26&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftps23731″>View Datasheet
Texas Instruments TPS23731 1-4 Power-over-Ethernet (PoE) Power Device (PD) combines a PoE PD interface and a current-mode DC-DC controller. The device is optimized for flyback switching regulator designs where the use of primary-side regulation (PSR) is supported. The PoE interface supports the IEEE 802.3bt and IEEE 802.3at standards for applications needing up to 25.5W or less at PD input. Programmable spread spectrum frequency dithering (SSFD) is provided to minimize the size and cost of the EMI filter. Advanced Startup with adjustable soft-start helps to use minimal bias capacitor while simplifying converter startup and hiccup design, also ensuring that IEEE 802.3bt/at startup requirements are met. The soft-stop feature of the Texas Instruments TPS23731 minimizes stress on switching sync FET(s), allowing FET BOM cost reduction.
The PSR feature of the DC-DC controller uses feedback from an auxiliary winding for control of the output voltage, eliminating the need for an external shunt regulator and optocoupler. It is optimized for continuous conduction mode (CCM) and can work with secondary-side synchronous rectification, resulting in optimum efficiency, regulation accuracy, and step load response over multiple outputs. The DC-DC controller features slope compensation and blanking. The typical switching frequency is 250kHz. The automatic MPS enables applications with low power modes or multiple power feeds. It automatically adjusts its pulsed current amplitude and duration according to PSE Type and system conditions to maintain power while minimizing consumption.
