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reference designTPS23755 | Demoboard TIDA-010034

Texas Instruments TPS23755 | Demoboard TIDA-010034

IEEE802.3at Type-1 PoE and 12V adapter input to point of load reference design for IP network camera

Overview

TopologyFlyback Converter
Input voltage37-57 V
Output 112 V
IC revisionE1

Description

Power over Ethernet (PoE) enables power to be delivered over the same ethernet cable as data with no danger of cross-talk, interference, or corruption of the data streams. This reference design showcases end-to-end power tree for an IP network camera powered using PoE or 12-V adapter based on the TI’s DaVinci™ Digital Media Processor or different application processor. The power tree also derives rails required for different peripherals of an IP network camera like: Image sensor, motor control, Ethernet PHY, RS485 interface, IR LED illumination, audio, motion sensing and the alarm interface.

Features

  • TPS23755 IEEE802.3at PoE PD with no-opto flyback DC-DC controller
    • Complete IEEE802.3at PD solution for type-1 PoE
    • Integrated flyback controller with primary side regulation (PSR), frequency dithering and advanced startup
    • 12-V output, 89% efficiency of the PoE-powered flyback power stage
    • Secondary side adapter priority control with smooth transition
  • No diode ORing: 88% less power dissipation in adapter input path with TPS2121 power MUX for secondary side ORing
  • Two power tree implementations:
    • For high efficiency: 12-V to PoL, using mid input range buck converters
    • For low cost: 12-V to 5-V to PoL, using low input range buck converters
  • Both power trees use buck converters with FPWM mode enabling:
    • Fast transient response for handling dynamic load switching on rails suppling power to MPU core and DDR RAM
    • Low output voltage ripple on voltage rails with tighter tolerances like MPU core and DDR RAM

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IV typ.(mcd)
VF typ.(V)
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150060YS75000
SPECWL-SMCW SMT Mono-color Chip LED Waterclear, 590 nm, Yellow
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Downloads27 files

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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), –, –
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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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