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TPS23757

ACTIVE

Class 3 PoE PD with flyback/Forward DC-DC controller & 12V-57V Adapter Support

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Data sheet

TPS23757

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 9.3 Vin (max) (V) 57 PoE current limit (min) (mA) 400 PoE inrush limit (mA) (typ) (A) 0.14 rDS(on) per FET (typ) (mΩ) 430 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 Primary-side adapter priority, Second Gate Drive, Thermal shutdown Operating temperature range (°C) -40 to 125 Rating Catalog
Vin (min) (V) 9.3 Vin (max) (V) 57 PoE current limit (min) (mA) 400 PoE inrush limit (mA) (typ) (A) 0.14 rDS(on) per FET (typ) (mΩ) 430 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 Primary-side adapter priority, Second Gate Drive, Thermal shutdown Operating temperature range (°C) -40 to 125 Rating Catalog
TSSOP (PW) 20 41.6 mm² 6.5 x 6.4
  • Powers up to 13 W (Input) PDs
  • Legacy and IEEE 802.3at Type 1 PDs
  • Optimized for Isolated DC/DC Converters
  • Supports High-Efficiency Topologies
  • Complete PoE Interface
  • Adapter ORing Support
  • Programmable Frequency with Synch.
  • Robust 100 V, 0.5 Ω Hotswap MOSFET
  • Pin Compatible with TPS23754/6
  • –40°C to 125°C Junction Temperature Range
  • Industry Standard TSSOP-20
  • Powers up to 13 W (Input) PDs
  • Legacy and IEEE 802.3at Type 1 PDs
  • Optimized for Isolated DC/DC Converters
  • Supports High-Efficiency Topologies
  • Complete PoE Interface
  • Adapter ORing Support
  • Programmable Frequency with Synch.
  • Robust 100 V, 0.5 Ω Hotswap MOSFET
  • Pin Compatible with TPS23754/6
  • –40°C to 125°C Junction Temperature Range
  • Industry Standard TSSOP-20

The TPS23757 is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode dc/dc controller optimized specifically for isolated converters. The PoE interface supports the IEEE 802.3at standard for a type 1 PD, which is equivalent to the 13W standard of IEEE 802.3-2008.

The TPS23757 supports a number of input voltage ORing options including highest voltage, external adapter preference, and PoE preference.

The TPS23757 has an output flag indicating if an external wall adapter is active when used in conjunction with ORing controls. The detection signature pin can also be used to force power from the PoE source off. Classification can be programmed to any of the defined types with a single resistor.

The dc/dc controller features two complementary gate drivers with programmable dead time. This simplifies design of highly-efficient flyback topologies or active-clamp forward or flyback converters. The second gate driver may be disabled if desired for single MOSFET topologies. The controller also features internal softstart, bootstrap startup source, current-mode compensation, and a 78% maximum duty cycle. A programmable and synchronizable oscillator allows design optimization for efficiency and eases use of the controller to upgrade existing power supply designs. Accurate programmable blanking, with a default period, simplifies the usual current- sense filter design trade-offs.

The TPS23757 has a 9 V converter startup, permitting operation with 12 V wall adapters.

The TPS23757 is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode dc/dc controller optimized specifically for isolated converters. The PoE interface supports the IEEE 802.3at standard for a type 1 PD, which is equivalent to the 13W standard of IEEE 802.3-2008.

The TPS23757 supports a number of input voltage ORing options including highest voltage, external adapter preference, and PoE preference.

The TPS23757 has an output flag indicating if an external wall adapter is active when used in conjunction with ORing controls. The detection signature pin can also be used to force power from the PoE source off. Classification can be programmed to any of the defined types with a single resistor.

The dc/dc controller features two complementary gate drivers with programmable dead time. This simplifies design of highly-efficient flyback topologies or active-clamp forward or flyback converters. The second gate driver may be disabled if desired for single MOSFET topologies. The controller also features internal softstart, bootstrap startup source, current-mode compensation, and a 78% maximum duty cycle. A programmable and synchronizable oscillator allows design optimization for efficiency and eases use of the controller to upgrade existing power supply designs. Accurate programmable blanking, with a default period, simplifies the usual current- sense filter design trade-offs.

The TPS23757 has a 9 V converter startup, permitting operation with 12 V wall adapters.
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Technical documentation

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Type Title Date
* Data sheet High Efficiency PoE Interface and DC/DC Controller datasheet (Rev. D) 20 Nov 2013
Application note PoE Powered Devices Debug Guidelines PDF | HTML 19 Jul 2021
Application note PoE PD Schematic Review Guidelines PDF | HTML 29 Apr 2021
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Lightning Surge Considerations for PoE Powered Devices 30 Apr 2015
Application note Implementing a Buck Converter With the TPS23753A 20 Sep 2010
User guide TPS23757EVM: Evaluation Module for TPS23757 (Rev. B) 30 Aug 2010
Application note Using the TPS23753A with an External Error Amplifier 06 Aug 2010
Application note Advanced Adapter ORing Solutions using the TPS23753 (Rev. A) 09 Feb 2009
Application note PoE Powered Device for 24 VAC Building Power Applications 10 Sep 2008
Application note Designing an EMI Compliant PoE with Isolated Flyback 20 May 2008
Application note Practical Guidelines EMI Compliant PoE 27 Mar 2008

Design & development

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Evaluation board

TPS23757EVM — 22-57 Vin, 5 Vout High Efficiency PoE Interface and DC/DC Controller Evaluation Module for TPS23757

The TPS23757EVM contains evaluation and reference circuitry for the TPS23757. The TPS23757 contains a powered device (PD) and a power supply controller supporting many high-efficiency topologies. The TPS23757EVM supports the IEEE 802.3at (draft) standard for a type 1 PD (equivalent to the 13W (...)

User guide: PDF
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Supported products & hardware

Supported products & hardware

Products
Powered devices
TPS2375 — Class 3 PoE PD with latch protection TPS23750 — Class 3 PoE PD with flyback DC-DC controller TPS23751 — IEEE 802.3at PoE interface with flyback DC-DC controller TPS23752 — IEEE 802.3at PoE interface with flyback DC-DC controller and Sleep Mode Feature TPS23753 — IEEE 802.3-2005 PoE Interface and Isolated Converter and Controller TPS23753A — IEEE 802.3-2005 PoE interface and Isolated Converter controller with Enhanced ESD Ride-Through TPS23754 — IEEE 802.3at, high efficiency, PoE interface and DC/DC controller TPS23754-1 — IEEE 802.3at PoE interface and isolated converter controller TPS23756 — Class 4 PoE PD with flyback/forward DC-DC controller & 12V-57V adapter support TPS23757 — Class 3 PoE PD with flyback/Forward DC-DC controller & 12V-57V Adapter Support TPS2376 — Class 3 PoE PD with adjustable UVLO threshold & latch protection TPS2377 — Class 3 PoE PD with legacy UVLO threshold & latch protection TPS2378 — IEEE 802.3at PoE High-Power PD interface with AUX Control TPS23785B — High-Power, High-Efficiency PoE PD and DC-to-DC Controller TPS2379 — IEEE 802.3at PoE High-Power PD interface with external gate driver
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TSSOP (PW) 20 Ultra Librarian
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