The TPS23758 device combines a Power over Ethernet (PoE) powered device (PD) interface, a 150-V switching power FET, and a current-mode DC-DC controller optimized for flyback topology. The high level of integration along with primary side regulation (PSR), spread spectrum frequency dithering (SSFD), and advanced startup makes the TPS23758 an ideal solution for size-constrained applications. The PoE implementation supports the IEEE 802.3at standard as a 13-W, Type 1 PD.
The PSR feature of the DC-DC controller uses feedback from an auxiliary winding for control of the output voltage, eliminating the need for external shunt regulator and optocoupler. It is optimized for operation in continuous conduction mode (CCM) with secondary side synchronous rectification, resulting in optimum overall efficiency, regulation accuracy and step load response over multiple outputs (for example 5-V and 3.3-V output). Typically, the converter operates at a switching frequency of 250 kHz.
SFFD and slew rate control helps to minimize the size and cost of the EMI filter. Advanced Startup allows the use of minimal bias capacitor while simplifying converter startup and hiccup design.
Primary auxiliary power detect (APD) pin can be used to provide priority for a primary side power adapter.
The DC-DC controller features adjustable soft-start, slope compensation, and blanking. For non-isolated applications, the buck topology is also supported by the TPS23758.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | TPS23758 IEEE 802.3at PoE PD with No-Opto Flyback DC-DC Controller datasheet (Rev. A) | 25 Nov 2020 | |
| Application note | PoE Powered Devices Debug Guidelines | PDF | HTML | 19 Jul 2021 | |
| Application note | PoE PD Schematic Review Guidelines | PDF | HTML | 29 Apr 2021 | |
| EVM User's guide | TPS23758EVM-080 Evaluation Module (Rev. B) | PDF | HTML | 14 Dec 2020 | |
| Analog Design Journal | A small-footprint PoE solution for machine-vision cameras and sensors | 30 Sep 2019 | ||
| Technical article | How to reduce the size of your 13-W PoE PD solution | PDF | HTML | 25 Jun 2019 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VSON (RJJ) | 23 | Ultra Librarian |
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