The TPS23755 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 TPS23755 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 with secondary side diode rectifier (typically 12-V output or higher). Typically, the converter operates in continuous conduction mode (CCM) 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.
Secondary auxiliary power detect capability provides priority for a secondary side power adapter, while ensuring smooth transition to and from PoE input power, with no efficiency or thermal trade-off.
The DC-DC controller features internal soft-start, slope compensation, and blanking. For non-isolated applications, the buck topology is also supported by the TPS23755.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | TPS23755 IEEE 802.3at PoE PD with No-Opto Flyback DC-DC Controller datasheet (Rev. B) | PDF | HTML | 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 | TPS23755EVM-894 Evaluation Module (Rev. A) | PDF | HTML | 14 Dec 2020 | |
| Technical article | How to reduce the size of your 13-W PoE PD solution | PDF | HTML | 25 Jun 2019 | |
| Application note | Lightning Surge Considerations for PoE Powered Devices | 30 Apr 2015 | ||
| Application note | Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) | 09 Feb 2009 | ||
| Application note | Designing an EMI Compliant PoE with Isolated Flyback | 20 May 2008 | ||
| Application note | Practical Guidelines EMI Compliant PoE | 27 Mar 2008 |
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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