High efficiency integrated IEEE 802.3at PoE-PD interface and PWM controller type 2 PSE indicator, plus support for forward active clamp topology

The PM8803 integrates a Power over Ethernet (PoE) interface and a current mode PWM controller to simplify the design of the power supply sections of all powered devices. The PoE/PoE+ interface includes all functions required by the IEEE 802.3at as well as detection, classification, undervoltage lockout (UVLO) and inrush current limitation.

The PM8803 specifically performs IEEE802.3at Layer 1 hardware classification, providing the system with an indication of Type 2 PSE successful detection.

The PM8803 has been designed to work with power either from the Ethernet cable or from an external power source such as a wall adapter, ensuring the priority of the auxiliary source over the PoE. The DC-DC section of the PM8803 features a programmable oscillator frequency, an adjustable slope compensation, dual complementary low-side drivers, programmable dead time and an internal temperature sensor.

The PM8803 targets high-efficiency conversion under all load conditions supporting flyback, forward, forward with active clamp converters and synchronous rectification.

Key Features

  • IEEE 802.3at compliant PD interface
  • Works with power supplied from Ethernet LAN cables or from local auxiliary sources
  • Successful IEEE802.3at Layer1 classification indicator
  • Integrated 100 V, 0.45 Ω, 1 A hot-swap MOSFET
  • Accurate 140 mA typ. inrush current level
  • Programmable classification current
  • Programmable DC current limit up to 1 A
  • Integrated high voltage start-up bias regulator
  • Thermal shutdown protection
  • Current mode pulse width modulator
  • Programmable oscillator frequency
  • 80% maximum duty cycle with internal slope compensation
  • Support for flyback, forward, forward active clamp, flyback with synchronous rectification

设计

技术文档

产品规格
Description Version Size
DS7139 DS7139: High-efficiency, IEEE 802.3at compliant integrated PoE-PD interface and PWM controller 3.0 1 MB
应用手册
Description Version Size
AN4006 AN4006: Designing a high-efficiency (60 W on 4 pairs) PoE converter using the PM8803 and an external current booster 1.0 3 MB
AN3373 AN3373: IEEE802.3at compliant PD + PS design based on PM8803 low power, synchronous flyback PoE converter 1.0 1 MB
AN3387 AN3387: PM8803 layout guidelines 1.0 944 KB
AN4473 AN4473: PoE synchronous flyback, IEEE802.3at compliant, 5V - 4A PD converter based on the PM8803 controller 1.1 2 MB
用户手册
Description Version Size
UM1063 UM1063: EVALPM8803-FLY: IEEE802.3at compliant demonstration kit with synchronous flyback converter 2.0 1 MB
UM1062 UM1062: EVALPM8803-FWD: IEEE802.3at compliant demonstration kit with synchronous active clamp forward converter 1.1 1 MB

出版刊物和宣传资料

宣传册
Description Version Size
PM8803: Integrated PoE+ PD interface and PWM controller 3.1 216 KB
手册
Description Version Size
Brochure Power management guide 05.2016 7 MB

工具和软件

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样片和购买

型号 Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
PM8803TR HTSSOP20 Tape And Reel Active - - NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
PM8803 HTSSOP20 Tube Active - - NEC EAR99 MALAYSIA MORE INFO
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

质量和可靠性

型号 Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
PM8803TR ActiveHTSSOP20IndustrialEcopack2 0 0
PM8803 ActiveHTSSOP20IndustrialEcopack2 0 0
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(**) 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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