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Texas Instruments TPS23754 | Demoboard PMP22301
IEEE 802.3at, high efficiency, PoE interface and DC/DC controller
Overview
| Topology | Other Topology |
| Input voltage | 24-48 V |
| Output 1 | 24 V / 0.9 A |
| IC revision | B |
Description
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.
Features
- 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
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Pins | PCB/Cable/Panel | Modularity | Wire Section | C | Tol. C | VR(V (DC)) | DF(%) | RISO | Ceramic Type | L(mm) | W(mm) | H(mm) | Fl(mm) | Packaging | IRP,40K(A) | ISAT,30%(A) | RDC typ.(mΩ) | fres(MHz) | VOP(V) | IR(A) | Working Voltage(V (AC)) | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(mΩ) | Type | Version | VIN | VOut1(V) | IOut1(A) | L(µH) | n | VT(V (RMS)) | Size | Vaux(V) | RDC 1(Ω) | RDC 2(Ω) | RDC 3(Ω) | Mount | Data rate | Ports | PoE | Improved CMRR | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-MAPI SMT Power Inductor, 2, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MAPI SMT Power Inductor | Pins2 | – | – | – | – | – | – | – | – | – | Length2 mm | Width1.6 mm | Height1 mm | – | – | Performance Rated Current4.35 A | Saturation Current @ 30%7.5 A | DC Resistance40 mΩ | Self Resonant Frequency205 MHz | Operating Voltage80 V | Rated Current2.5 A | – | – | – | – | – | DC Resistance53 mΩ | – | VersionSMT | – | – | – | Inductance0.33 µH | – | – | Size2010 | – | – | – | – | MountSMT | – | – | – | – | Operating Temperature -40 °C up to +125 °C | ||||
 | WE-MAPI SMT Power Inductor, 2, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MAPI SMT Power Inductor | Pins2 | – | – | – | – | – | – | – | – | – | Length4 mm | Width4 mm | Height2 mm | – | – | Performance Rated Current5.15 A | Saturation Current @ 30%7.1 A | DC Resistance39.9 mΩ | Self Resonant Frequency26 MHz | Operating Voltage80 V | Rated Current3.6 A | – | – | – | – | – | DC Resistance48 mΩ | – | VersionSMT | – | – | – | Inductance3.3 µH | – | – | Size4020 | – | – | – | – | MountSMT | – | – | – | – | Operating Temperature -40 °C up to +125 °C | ||||
 | WR-TBL Series 2141 - 3.50 mm Horiz. Entry Modular, 2, Rising Cage Clamp | Simulation– | Downloads6 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-TBL Series 2141 - 3.50 mm Horiz. Entry Modular | Pins2 | PCB/Cable/PanelPCB | ModularityYes | Wire Section 24 to 16 (AWG) 0.2 to 1 (mm²) | – | – | – | – | – | – | Length7.05 mm | – | – | – | PackagingBox | – | – | – | – | – | Rated Current10 A | Working Voltage300 V (AC) | – | – | – | – | – | TypeHorizontal | – | – | – | – | – | – | – | – | – | – | – | – | MountTHT | – | – | – | – | Operating Temperature -40 °C up to +105 °C | ||
 | WR-PHD Pin Header - Single, 2, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header - Single | Pins2 | – | – | – | – | – | – | – | Insulation Resistance1000 MΩ | – | Length5.08 mm | – | – | – | PackagingBag | – | – | – | – | – | Rated Current3 A | Working Voltage250 V (AC) | – | – | – | – | – | TypeStraight | – | – | – | – | – | – | – | – | – | – | – | – | MountTHT | – | – | – | – | Operating Temperature -40 °C up to +105 °C | |||
 | WE-LAN LAN Transformer, 24, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LAN LAN Transformer | Pins24 | – | – | – | – | – | – | – | – | – | Length17.55 mm | Width16 mm | Height7.2 mm | Pad Dimension13.97 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | Type4PPoE (to 600 mA) | VersionSMT | – | – | – | Inductance350 µH | Turns Ratio1:1 | Insulation Test Voltage1500 V (RMS) | – | – | – | – | – | MountSMT | Data rate10/100/1000BASE-T | Ports1 | PoE4PPoE (up to 600 mA) | Improved Common Mode RejectionNo | Operating Temperature -40 °C up to +105 °C | ||||
 | WE-CBF SMT EMI Suppression Ferrite Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | – | – | – | – | Length2 mm | Width1.2 mm | Height0.0009 mm | Pad Dimension0.5 mm | – | – | – | – | – | – | Rated Current1.5 A | – | Impedance @ 100 MHz600 Ω | Maximum Impedance700 Ω | Maximum Impedance150 MHz | Rated Current 22000 mA | DC Resistance150 mΩ | TypeHigh Current | VersionSMT | – | – | – | – | – | – | Size0805 | – | – | – | – | MountSMT | – | – | – | – | Operating Temperature -55 °C up to +125 °C | ||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | Capacitance1 µF | Capacitance±10% | Rated Voltage50 V (DC) | Dissipation Factor10 % | Insulation Resistance0.1 GΩ | Ceramic TypeX7R Class II | Length2 mm | Width1.25 mm | Height1.25 mm | Pad Dimension0.5 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Size0805 | – | – | – | – | – | – | – | – | – | Operating Temperature -55 °C up to +125 °C | |||||
| WCAP-CSGP MLCCs 100 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 100 V(DC) | – | – | – | – | Capacitance100 nF | Capacitance±10% | Rated Voltage100 V (DC) | Dissipation Factor2.5 % | Insulation Resistance1 GΩ | Ceramic TypeX7R Class II | Length2 mm | Width1.25 mm | Height1.25 mm | Pad Dimension0.5 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Size0805 | – | – | – | – | – | – | – | – | – | Operating Temperature -55 °C up to +125 °C | |||||
| WCAP-CSGP MLCCs 100 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 100 V(DC) | – | – | – | – | Capacitance10 nF | Capacitance±10% | Rated Voltage100 V (DC) | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Size0603 | – | – | – | – | – | – | – | – | – | Operating Temperature -55 °C up to +125 °C | |||||
 | WE-PoE+ Power over Ethernet Plus Transformer, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PoE+ Power over Ethernet Plus Transformer | – | – | – | – | – | – | – | – | – | – | Length21.8 mm | Width29.65 mm | Height11.43 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | VersionCCM Flyback | Input Voltage 17 - 57 V (DC) | Output Voltage 124 V | Output Current 11 A | Inductance80 µH | Turns Ratio1:1:0.46 | Insulation Test Voltage1500 V (RMS) | SizeEFD20 | Auxiliary Voltage10.6 V | DC Resistance 10.125 Ω | DC Resistance 20.1 Ω | DC Resistance 30.165 Ω | MountSMT | – | – | – | – | Operating Temperature -40 °C up to +125 °C |