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Freescale - IEEE 802.3af PD With Current Mode Switching Reg - 18 June 2012

The 34670 combines a Power Interface Port for IEEE 802.3af Powered Devices (PD) and a high performance current mode switching regulator.

It allows a designer to build PDs with a minimum of external components by means of integrating the required IEEE 802.3af functions and all functions necessary to build a high efficiency DC/DC converter.

On the PD side, the 34670 fully supports the IEEE802.3af standard and provides complete signature and power classification functions.

It controls inrush current limiting and incorporates adjustable undervoltage lockout. The switching regulator provides excellent line and load regulation. It drives an external Power MOSFET with sense resistor.

  Product page  Datasheet

    PD Interface
  • Integrated IEEE 802.3af Compliant Interface
  • Signature Detection and Classification Functionality
  • Integrated Isolation Switch
  • Programmable Inrush Current Limiting Control
  • Adjustable Undervoltage Lockout
  • Input Voltage Range up to 80 V

  • PWM Controller
  • No auxiliary winding necessary, device directly supplied from VP WR
  • Current Mode Control offers fast response and perfect stability
  • Adjustable Oscillator
  • Leading edge blanking
  • Internal slope compensation circuitry
  • Overvoltage Protection

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