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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 | Product series | IRP,40K (A) | ISAT,30% (A) | RDC (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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 74439346056 | SPEC | 8 files | WE-XHMI SMT Power Inductor | 8.9 | 12.1 | 15 | 25 | – | 1 | – | – | – | – | – | – | – | – | – | -40 °C up to +125 °C | – | SMT | 5.6 | – | ||
 | 744272471 | SPEC | 8 files | WE-SL5 SMT Common Mode Line Filter | – | – | – | – | sectional | 2 | 470 | 1750 | 1600 | 0.065 | 80 | – | – | – | – | – | 1000 | SMT | 470 | 3000 | ||
 | 7490220123 | SPEC | 8 files | WE-LAN LAN Transformer | – | – | 500 | – | – | – | 180 | – | – | – | – | 1000 Base-T | 1 | 4PPoE (up to 1500 mA) | No | -40 °C up to +105 °C | 1500 | SMT | 180 | – |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 74439346056 | SPEC | |
| 744272471 | SPEC | |
| 7490220123 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Product series | IRP,40K (A) | ISAT,30% (A) | RDC (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 |
|---|