STEVAL-POE006V1

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3.3V/20A, active clamp forward converter, Power Over Ethernet (PoE) IEEE 802.3bt compliant reference design

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Product overview

Description

This reference design represents a 3.3 V, 20 A converter solution ideal for various applications including wireless access points, supplied with a PoE-PD interface and a DC-DC active clamp forward converter.

The PoE-PD interface is based on the PM8805 system in package device with two active bridges and an IEEE 802.3bt compliant Powered Device (PD) interface. It can be used in all medium-to-high power 2P and 4P high efficiency PoE and PoE+ applications.

The DC-DC active clamp forward converter is designed around the PM8804 PWM controller, which is an integrated solution for smart and efficient 48 V converters, featuring a programmable oscillator for the switching frequency, adjustable slope compensation, dual complementary low-side drivers with programmable dead time, programmable soft start, soft turn off and a programmable current sense blanking time.

  • All features

    • Features of the PM8805 PoE-PD interface:
      • System in package integrating a double active bridge, a hot-swap MOSFET and a PoE-PD
      • Supports legacy high power, 4-pair applications
      • 100 V N-ch MOSFETs with 0.2 Ω total path resistance for each active bridge
      • Identifies which kind of PSE (standard or legacy) it is connected to and provides successful IEEE 802.3af/at/bt classification indication as a combination of the T0, T1 and T2 signals (open drain)
      • Smart operation mode selection through the STBY, FAUX and RAUX control signals
      • QFN 56 8x8mm package with 43 pins and 6 exposed pads
    • Features of the PM8804 PWM controller:
      • PWM peak current mode controller
      • Input operating voltage up to 75 V
      • Internal high voltage start up regulator with 20 mA capability
      • Programmable fixed frequency up to 1 Mhz
      • Soft startup with settable time
      • Soft turn off (optionally disabled)
      • Dual 1 APK, low side complementary gate drivers
      • GATE2 can be turned off for reduced consumption
      • 80% maximum duty cycle with internal slope compensation
      • QFN 16 3x3mm package with exposed pad

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade WEEE Compliant Material Declaration**
STEVAL-POE006V1
Active
CARD Industrial Ecopack2 Yes

STEVAL-POE006V1

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CARD

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Industrial

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Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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STEVAL-POE006V1

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PM8804, PM8805

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