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TPS23754-1

ACTIVE

IEEE 802.3at PoE interface and isolated converter controller

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Data sheet

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TPS23734 ACTIVE IEEE 802.3bt type 3 class 1-4 PoE PD with high efficiency DC-DC control Newer Version

TPS23754-1

ACTIVE
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Product details

Vin (min) (V) 15.7 Vin (max) (V) 57 PoE current limit (min) (mA) 850 PoE inrush limit (mA) (typ) (A) 0.14 rDS(on) per FET (typ) (mΩ) 430 PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2 PD power level 13W, 25W 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) 15.7 Vin (max) (V) 57 PoE current limit (min) (mA) 850 PoE inrush limit (mA) (typ) (A) 0.14 rDS(on) per FET (typ) (mΩ) 430 PoE standards supported 802.3at Type 1 (802.3af), 802.3at Type 2 PD power level 13W, 25W 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
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • Powers up to 30-W (Input) PDs
  • DC-DC Control Optimized for Isolated Converters
  • Supports High-Efficiency Topologies
  • Complete PoE Interface
  • Enhanced Classification per IEEE 802.3at With Status Flag
  • Adapter ORing Support
  • Programmable Frequency With Synchronization
  • Robust 100-V, 0.5-Ω Hotswap MOSFET
  • –40°C to 125°C Junction Temperature Range
  • Industry Standard PowerPAD™ HTSSOP-20
  • Powers up to 30-W (Input) PDs
  • DC-DC Control Optimized for Isolated Converters
  • Supports High-Efficiency Topologies
  • Complete PoE Interface
  • Enhanced Classification per IEEE 802.3at With Status Flag
  • Adapter ORing Support
  • Programmable Frequency With Synchronization
  • Robust 100-V, 0.5-Ω Hotswap MOSFET
  • –40°C to 125°C Junction Temperature Range
  • Industry Standard PowerPAD™ HTSSOP-20

The TPS23754 and TPS23756 devices have 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.

The TPS23754 and TPS23756 support a number of input voltage ORing options including highest voltage, external adapter preference, and PoE preference. These features allow the designer to determine which power source will carry the load under all conditions.

The PoE interface features the new extended hardware classification necessary for compatibility with high-power midspan power sourcing equipment (PSE) per IEEE 802.3at. 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 the design of active-clamp forward converters or optimized gate drive for highly-efficient flyback topologies. The second gate driver may be disabled if desired for single MOSFET topologies. The controller also features internal soft start, bootstrap start-up 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 TPS23754 device has a 15-V converter start-up while the TPS23756 device has a 9-V converter start-up. The TPS23754-1 replaces the PPD pin with a no-connect for increased pin spacing.

The TPS23754 and TPS23756 devices have 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.

The TPS23754 and TPS23756 support a number of input voltage ORing options including highest voltage, external adapter preference, and PoE preference. These features allow the designer to determine which power source will carry the load under all conditions.

The PoE interface features the new extended hardware classification necessary for compatibility with high-power midspan power sourcing equipment (PSE) per IEEE 802.3at. 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 the design of active-clamp forward converters or optimized gate drive for highly-efficient flyback topologies. The second gate driver may be disabled if desired for single MOSFET topologies. The controller also features internal soft start, bootstrap start-up 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 TPS23754 device has a 15-V converter start-up while the TPS23756 device has a 9-V converter start-up. The TPS23754-1 replaces the PPD pin with a no-connect for increased pin spacing.

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Technical documentation

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Type Title Date
* Data sheet TPS2375x IEEE 802.3at, High Efficiency, PoE Interface and DC-DC Controller datasheet (Rev. I) PDF | HTML 19 Dec 2017
Application note PoE Powered Devices Debug Guidelines PDF | HTML 19 Jul 2021
Application note PoE PD Schematic Review Guidelines PDF | HTML 29 Apr 2021
User guide TPS23754EVM-383 EVM: Evaluation Module for TPS23754. (Rev. C) 28 Nov 2011
Application note Implementing a Buck Converter With the TPS23753A 20 Sep 2010
Application note Using the TPS23753A with an External Error Amplifier 06 Aug 2010
User guide TPS23754EVM-420 EVM: Evaluation Module for TPS 17 Apr 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

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TPS23754EVM-383 — 33-57V Vin, 12V Vout High Power Evaluation Module for TPS23754

TPS23754EVM-383 contains evaluation and reference circuitry for the TPS23754, which is a Class 4 (25.5 W) PoE PD + PWM Controller. The TPS23754 is targeted at wide Vin aplications (24 V - 60 V) in isolated converter topologies and is compliant with the IEEE 802.3 at Power over Ethernet (PoE) (...)

User guide: PDF
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Evaluation board

TPS23754EVM-420 — 20-57V Vin, 5V Vout High Power Evaluation Module for TPS23754

TPS23754EVM-420 contains evaluation and reference circuitry for the TPS23754, which is a Class 4 (25.5 W) PoE PD + PWM Controller. The TPS23754 is targeted at wide Vin aplications (24 V - 60 V) in isolated converter topologies and is compliant with the IEEE 802.3at Power over Ethernet (PoE) (...)

User guide: PDF
Not available on TI.com
Calculation tool

SLUC480 — PoE PD Efficiency Calculator

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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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 (...)
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HTSSOP (PWP) 20 Ultra Librarian
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