IEEE802.3at Type-1 PoE and 12V adapter input to point of load reference design for IP network camera
TIDA-010034
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Key Document

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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Design Files

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TI Devices (13)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM3880  3 Rail Simple Power Sequencer with Fixed Time Delay  Power management  Sample & Buy View Design Kits & Evaluation Modules
TLV62568  2.5V-5.5V input, 1A high efficiency step-down buck converter in SOT23 and SOT563 package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TLV62568A  2.5V-5.5V input, 1A high efficiency step-down buck converter with forced PWM in small SOT563 package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TLV62569A  2A High Efficiency Step-down Buck Converter with forced PWM in SOT Package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TLV742P  200-mA small-size low-dropout (LDO) linear voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS2121  2.7-22V, 56mΩ, 4.5A, Priority Power MUX with Seamless Switchover  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS23755  IEEE 802.3at PoE PD with no-opto flyback DC-DC controller  Power over Ethernet (PoE)  Sample & Buy View Design Kits & Evaluation Modules
TPS54201  4.5V-to-28V Input Voltage, Synchronous Buck LED Driver  LED drivers  Sample & Buy View Design Kits & Evaluation Modules
TPS54202H  4.5V to 28V Input, 2A Output, Synchronous Step-Down Voltage Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS561201  4.5V to 17V Input, 1A Synchronous Step-Down Voltage Regulator in 6-pin SOT-23  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS561208  4.5V to 17V Input, 1A Output, Synchronous Step-Down Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS562201  4.5 V to 17 V input, 2 A output, synchronous step-down converter in Eco-mode  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS562208  4.5 V to 17 V input, 2 A output, synchronous step-down converter in FCCM mode  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM3880 Download Download
TLV62568 Download
Download Download
TLV62568A Download Download
TLV62569A Download Download
TLV742P Download Download
TPS2121 Download Download
TPS23755 VSON (RJJ)| 23 Download
TPS54201 Download Download
TPS54202H Download Download
TPS561201 Download Download
TPS561208 Download Download
TPS562201 Download Download
TPS562208 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 10126 12 Feb 2019
Design files (6)
Title Type Size (KB) Date
ZIP 563 12 Feb 2019
ZIP 6380 12 Feb 2019
PDF 3280 12 Feb 2019
PDF 1009 12 Feb 2019
PDF 83 12 Feb 2019
PDF 1024 12 Feb 2019

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