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Design Notes

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  Active Bridge Rectifiers Reduce Heat Dissipation within PoE Security Cameras &mdash DN519
  PDF, 106 Kb, File published: Aug 28, 2013
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  Active Bridge Rectifiers Reduce Heat Dissipation within PoE
  Security Cameras – Design Note 519
  Ryan Huff
  Introduction
  Power over Ethernet (PoE) has been embraced by the
  video surveillance industry as a solution to an age-old
  problem: complicated cabling. For instance, a basic,
  traditional fixed-view security camera requires two
  cables: one for power (10W to 15W from a 24V AC
  or 12V DC), and a separate, coax cable for the video
  signal. With PoE, a single Ethernet cable carries both
  video data and power. Everything is simplified. Right?
  Not quite. To meet compatibility with existing systems,
  camera manufacturers must produce PoE-enabled
  cameras that are also compatible with legacy power
  sources—they must accept PoE 37V to 57V DC from
  an RJ-45 jack or 24V AC, +12V DC, or –12V DC from
  an auxiliary power connector.
  The Old Way Loses Power
  Figure 1 shows the power architecture used by many
  PoE camera manufacturers to solve this problem. A
  full-bridge diode rectifier after the auxiliary (old-school)
  input produces positive DC power from either 24V AC, …

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Manufacturer's Classification

• Monitor, Control and Protection > Power-over-Ethernet (PoE) Interface Controllers > PoE Powered Device (PD)
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Power Management

Other Names:

LT4275AIDDTRPBF, LT4275AIDD TRPBF