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reference designTPS23755 | Demoboard TPS23755EVM-894

Texas Instruments TPS23755 | Demoboard TPS23755EVM-894

IEEE 802.3at PoE PD with no-opto flyback DC-DC controller

Overview

TopologyFlyback Converter
Input voltage37-57 V
Output 112 V / 1 A
IC revisionA

Description

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.

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
  • 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

Typical applications

  • IP cameras, Access Points, Point-of-Sale, Barcode Readers, IP Phones, Wireless LAN – wireless access points

More information

Products

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Order Code
Data­sheet
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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
Operating Temperature
Q
RISO
Ceramic Type
L(mm)
W(mm)
H(mm)
Fl(mm)
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SamplesAvailability & Sample
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150060YS75000
SPECWL-SMCW SMT Mono-color Chip LED Waterclear, 590 nm, Yellow
Simu­lation
Availability
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Downloads27 files

RAY files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear
Dominant Wavelength [typ.]590 nm
Emitting ColorYellow 
Peak Wavelength [typ.]595 nm
Luminous Intensity [typ.]120 mcd
Forward Voltage [typ.]2 V
Chip TechnologyAlInGaP 
Viewing Angle Phi 0° [typ.]140 °
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Size0603 
Operating Temperature -40 °C up to +85 °C
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Length1.6 mm
Width0.8 mm
Height0.7 mm
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PackagingTape and Reel 
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885012005061
SPECWCAP-CSGP MLCCs 50 V(DC), –, –
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWCAP-CSGP MLCCs 50 V(DC)
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Capacitance100 pF
Capacitance±5% 
Rated Voltage50 V (DC)
Size0402 
Operating Temperature -55 °C up to +125 °C
Q-Factor1000 
Insulation Resistance10 GΩ
Ceramic TypeNP0 Class I 
Length1 mm
Width0.5 mm
Height0.5 mm
Pad Dimension0.25 mm
Packaging7" Tape & Reel 
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