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STMicroelectronics PM8804 | Demoboard STEVAL-POE003V1
Power over Ethernet - PD converter with 5 V 8 A output, synchronous Flyback, IEEE802.3bt standard compliant
Overview
| Topology | Flyback Converter |
| Input voltage | 40-60 V |
| Switching frequency | 280 kHz |
| Output 1 | 5 V / 8 A |
| IC revision | 1 |
Description
The STEVAL-POE002V1 power device evaluation board is equipped with a DC-DC converter stage, managed by the PM8804 controller, which provides 40 W (5 V-8 A) on the output. The DC-DC converter stage is based on the fixed frequency Flyback topology with a secondary synchronous rectification managed by the controller via gate driver transformer.The evaluation board embeds also the PM8805 controller, dedicated to the Ethernet interface (compliant with the Standard I EEE802.3.af/at/bt) and to the full active bridgerectification.
Features
- Based on PM8804 and PM8805
- IEEE 802.3bt compliant PD interface
- Works with power supplied from Ethernet LAN cables or local auxiliary sources
- Line input voltage range: 40 to 60 VDC
- Output voltage: 5 VDC ± 2.5%
- Output current: 8 A
- Peak-to-peak output ripple: < 50 mV
- DC-DC full load efficiency: > 91%
- Overall full load efficiency: > 90%
- Transient response ΔV pk-pk 100% to 50% load step ≈ 700mV
- Switching frequency ≈ 280 KHz
Typical applications
- PoE powered devices such as IP phones, WLAN access points and network cameras / Telecom power supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | IRP,40K(A) | ISAT,30%(A) | RDC typ.(mΩ) | RDC max.(mΩ) | fres(MHz) | Winding Style | Number of windings | L1(µH) | Zmax(Ω) | IR(mA) | RDC max.(Ω) | VR(V) | Data rate | Ports | PoE | Improved CMRR | Operating Temperature | VT(V (AC)) | Mount | L(µH) | LSmin.(nH) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-XHMI SMT Power Inductor, 8.9 A, 12.1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-XHMI SMT Power Inductor | Performance Rated Current8.9 A | Saturation Current @ 30%12.1 A | DC Resistance15 mΩ | DC Resistance16.5 mΩ | Self Resonant Frequency25 MHz | – | Number of windings1 | – | – | – | – | – | – | – | – | – | Operating Temperature -40 °C up to +125 °C | – | MountSMT | Inductance5.6 µH | – | ||||
 | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-SL5 SMT Common Mode Line Filter | – | – | – | DC Resistance65 mΩ | – | Winding Stylesectional | Number of windings2 | Inductance [1]470 µH | Maximum Impedance1800 Ω | Rated Current1600 mA | DC Resistance [1]0.065 Ω | Rated Voltage80 V | – | – | – | – | Operating Temperature -40 °C up to +125 °C | Insulation Test Voltage1000 V (AC) | MountSMT | Inductance470 µH | Leakage Inductance [min.]3000 nH | |||||
 | WE-LAN LAN Transformer, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LAN LAN Transformer | – | – | – | – | – | – | – | Inductance [1]180 µH | – | – | – | – | Data rate1000 Base-T | Ports1 | PoE4PPoE (up to 1500 mA) | Improved Common Mode RejectionNo | Operating Temperature -40 °C up to +105 °C | Insulation Test Voltage1500 V (AC) | MountSMT | Inductance180 µH | – |