Product details


Vin (Min) (V) 10.2 Vin (Max) (V) 57 PoE current limit (Min) (mA) 405 PoE inrush limit (Typ) (mA) 140 rDS(on) per FET (Typ) (mOhms) 360 PoE standards supported 802.3at Type 1 (802.3af) PD power level 13W DC/DC control PD and DC/DC Fault response Auto Retry Features Advanced startup, Error Amplifier, Integrated Switching FET, Primary-Side Regulation, Secondary Side Adapter Priority, Spread Spectrum Frequency Dithering, Thermal Shutdown Switching frequency Programmable, Synchronizable open-in-new Find other Powered devices


  • Complete IEEE 802.3at PD solution for type 1 PoE
    • Ethernet Alliance (EA) logo certified designs available
    • Robust 100-V, 0.36-Ω (typ) hotswap MOSFET
    • Programmable classification level
  • Integrated PWM controller with 0.77-Ω (typ) 150-V power MOSFET
    • Flyback controller with PSR
      • Supports CCM operation with secondary side diode rectifier
      • ±3% (typ, 12-V Output) Load regulation (5%-100% range)
    • Supports low-side switch buck topology
    • Adjustable switching frequency with synchronization
    • advanced startup
    • Programmable slew rate and frequency dithering for enhanced EMI reduction
  • Secondary side adapter priority control with smooth transition
  • –40°C to 125°C Junction temperature range
  • Small 6-mm x 4-mm VSON package

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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.

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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
TPS23758 ACTIVE IEEE 802.3at PoE PD with no-opto sync flyback DC-DC controller This product is recommended for 5V or lower output voltage applications in order to maintain output voltage regulation accuracy.

Technical documentation

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Type Title Date
* Datasheet TPS23755 IEEE 802.3at PoE PD with No-Opto Flyback DC-DC Controller datasheet (Rev. B) Nov. 25, 2020
User guide TPS23755EVM-894 Evaluation Module (Rev. A) Dec. 14, 2020
Technical articles How to reduce the size of your 13-W PoE PD solution Jun. 25, 2019
Application note Lightning Surge Considerations for PoE Powered Devices Apr. 30, 2015
Application note Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) Feb. 09, 2009
Application note Designing an EMI Compliant PoE with Isolated Flyback May 20, 2008
Application note Practical Guidelines EMI Compliant PoE Mar. 27, 2008

Design & development

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Hardware development

document-generic User guide
The TPS23755 evaluation module (TPS23755EVM-894) contains evaluation and reference circuitry for the TPS23755, which is a IEEE802.3at Type 1 PoE PD controller suitable for Type 1 (13W) PoE PD applications.
  • Ethernet Alliance certified for receiving Class 3 power
  • IEEE802.3at Type 1 compliant PoE PD
  • Primary Side Regulated 12V Low Cost CCM Flyback
  • Programmable Slew Rate and Frequency Dithering for EMI Reduction
  • Secondary side adapter priority control with smooth transition Integrated Primary FET

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SLVC738.ZIP (605 KB)

Reference designs

EMC-compliant 10/100-Mbps Ethernet PHY reference design with IEEE802.3at Type-1 (≤ 12.95 W) PoE-PD
TIDA-010046 — This reference design provides a cost-optimized solution for 10 to 100 Mbps using the low-power Ethernet physical layer (PHY) DP83825 supporting 150-m reach over CAT5e cable which is beyond the standard Ethernet distance limitation of 100 m (328 feet). This design also demonstrates power (...)
document-generic Schematic document-generic User guide
IEEE802.3at Type-1 PoE and 12V adapter input to point of load reference design for IP network camera
TIDA-010034 — Power over Ethernet (PoE) enables power to be delivered over the same ethernet cable as data with no danger of cross-talk, interference, or corruption of the data streams. This reference design showcases end-to-end power tree for an IP network camera powered using PoE or 12-V adapter based on the (...)
document-generic Schematic document-generic User guide

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