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TPS23755

AKTIV

IEEE 802.3at PoE-PD mit DC/DC-Flyback-Controller in No-Opto-Technologie

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TPS23755

AKTIV
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Produktdetails

Vin (min) (V) 10.2 Vin (max) (V) 57 PoE current limit (min) (mA) 405 PoE inrush limit (mA) (typ) (A) 0.14 rDS(on) per FET (typ) (mΩ) 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 Operating temperature range (°C) -40 to 125 Rating Catalog
Vin (min) (V) 10.2 Vin (max) (V) 57 PoE current limit (min) (mA) 405 PoE inrush limit (mA) (typ) (A) 0.14 rDS(on) per FET (typ) (mΩ) 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 Operating temperature range (°C) -40 to 125 Rating Catalog
VSON (RJJ) 23 24 mm² 6 x 4
  • 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
  • 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

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.

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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Technische Dokumentation

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Typ Titel Datum
* 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 Dez 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 Mai 2008
Application note Practical Guidelines EMI Compliant PoE 27 Mär 2008

Design und Entwicklung

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Evaluierungsplatine

TPS23755EVM-894 — TPS23755-Evaluierungsmodul für IEEE802.3at Typ 1 PoE PD-Anwendungen

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.
Benutzerhandbuch: PDF | HTML
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Gerberdatei

TPS23755EVM-894 Gerber

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Referenzdesigns

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Referenzdesigns

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