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Texas Instruments TPS23758RJJ | Demoboard TIDA-010083
IEEE 802.3at PoE PD with no-opto sync flyback DC-DC controller
Overview
| Topology | Flyback Converter |
| Input voltage | 18-57 V |
| Output 1 | 5 V / 2.5 A |
| IC revision | 001 |
Description
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 TPS23758 an ideal solution for size-constrained applications. The PoE implementation supports the IEEE 802.3at standardas 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 in continuous conduction mode (CCM) with secondary side synchronous rectification, resulting in optimum overall efficiency, regulation accuracy and step load response over multiple outputs (for example 5-V and 3.3-V output). Typically, the converteroperates 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. Primary auxiliary power detect (APD) pin can be used to provide priority for a primary side power adapter.The DC-DC controller features adjustable soft-start, slope compensation, and blanking. For non-isolated applications, the buck topology is also supported by the TPS23758.
Features
- 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
- Integrated PWM controller with 0.77-Ω (typ) 150-V power MOSFET– Flyback controller with PSR– Supports CCM operation with secondary
- side synchronous FET— multi-outputs– ±1% (typ, 5-V Output) Load regulation (0-
- 100% load range) — with Sync FET– Supports low-side switch buck topology– Adjustable switching frequency with
- synchronization– Soft-start control with advanced startup– Programmable slew rate and frequency
- dithering for enhanced EMI reduction
- Primary adapter priority input
- –40°C to 125°C Junction temperature range
- Small 6-mm x 4-mm VSON package
Typical applications
- IEEE 802.3at compliant powered devices / VoIP phones / Security cameras / IP phones / Access points
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | λDom typ.(nm) | Emitting Color | λPeak typ.(nm) | IV typ.(mcd) | VF typ.(V) | Chip Technology | 2θ50% typ.(°) | C | Tol. C | VR(V (DC)) | Size | Q(%) | 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) | VIN | VOut1(V) | IOut1(A) | Vaux(V) | Qmin. | n | ISAT(A) | LS(µH) | Data rate | Ports | PoE | Improved CMRR | Operating Temperature | VT(V (RMS)) | Mount | L(µH) | CWW 1(pF) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WL-SMCC SMT Mono-color Chip LED Compact, 525 nm, Green | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWL-SMCC SMT Mono-color Chip LED Compact | Dominant Wavelength [typ.]525 nm | Emitting ColorGreen | Peak Wavelength [typ.]515 nm | Luminous Intensity [typ.]800 mcd | Forward Voltage [typ.]3.2 V | Chip TechnologyInGaN | Viewing Angle Phi 0° [typ.]120 ° | – | – | – | Size0402 | – | – | – | Length1 mm | Width0.5 mm | Height0.4 mm | – | PackagingTape and Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Operating Temperature -40 °C up to +85 °C | – | MountSMT | – | – | ||||
 | WE-MAPI SMT Power Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MAPI SMT Power Inductor | – | – | – | – | – | – | – | – | – | – | Size3015 | – | – | – | Length3 mm | Width3 mm | Height1.5 mm | – | – | Performance Rated Current2.7 A | Saturation Current @ 30%3.85 A | DC Resistance114 mΩ | Self Resonant Frequency35 MHz | Operating Voltage80 V | – | – | – | – | – | – | Saturation Current3.2 A | – | – | – | – | – | Operating Temperature -40 °C up to +125 °C | – | MountSMT | Inductance3.3 µH | – | ||||
 | WE-LAN LAN Transformer, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LAN LAN Transformer | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Length17.5 mm | Width14.2 mm | Height5.4 mm | Pad Dimension13.97 mm | – | – | – | – | – | – | – | – | – | – | – | Turns Ratio1:1 | – | – | Data rate1000 Base-T | Ports1 | PoEPoE (up to 350 mA) | Improved Common Mode RejectionNo | Operating Temperature 0 °C up to +70 °C | Insulation Test Voltage1500 V (RMS) | MountSMT | Inductance350 µH | – | ||||
| WCAP-CSGP MLCCs 10 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 10 V(DC) | – | – | – | – | – | – | – | Capacitance22 pF | Capacitance±5% | Rated Voltage10 V (DC) | Size0402 | Q-Factor840 % | Insulation Resistance10 GΩ | Ceramic TypeNP0 Class I | Length1 mm | Width0.5 mm | Height0.5 mm | Pad Dimension0.25 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | Q-Factor [1]840 | – | – | – | – | – | – | – | Operating Temperature -55 °C up to +125 °C | – | – | – | – | |||||
 | WE-FLYTI Flyback Transformers, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-FLYTI Flyback Transformers | – | – | – | – | – | – | – | – | – | – | SizeEPQ13 | – | – | – | Length13.97 mm | Width18.25 mm | Height14.5 mm | – | – | – | – | – | Self Resonant Frequency1.4 MHz | – | Input Voltage 36 - 57 V (DC) | Output Voltage 15 V | Output Current 12.4 A | Auxiliary Voltage10.5 V | – | Turns Ratio6:1:1:2.25 | Saturation Current1.5 A | Leakage Inductance1 µH | – | – | – | – | Operating Temperature -40 °C up to +125 °C | Insulation Test Voltage1500 V (RMS) | MountSMT | Inductance150 µH | Interwinding Capacitance85 pF |