STEVAL-POE001V1 Data brief Power Over Ethernet (PoE) - IEEE 802.3bt compliant interface reference design Features System in package including a dual active bridge, a hot swap MOSFET and a PoE-PD interface Robust 100V N-ch MOSFETs with 0.2 total path resistance for each active bridge Robust 100 V, 0.1 high side N-ch hot swap MOSFET PoE-PD single-signature interface compliant with IEEE 802.3bt Detection and support of high power, 4-pair applications Identifies which kind of PSE (standard or legacy) it is connected with, and provides successful IEEE 802.3af/at/bt classification indication through combination of the T0, T1 and T2 signals (open drain) Programmable classification current with 3.3 ms delay Advanced energy-saving MPS timings Two step hot swap current protection: DC with 1 ms delay and overload with 10 s delay Startup phase (pre-charge of the output capacitor), performed using an internally limited current source PGD signal (open drain) to enable an external PWM controller Thermal shutdown protection RoHS compliant WEEE compliant Product summary Description Smart evaluation board This reference design integrates a high power standard PoE-PD interface compliant STEVAL- for high power 4-pair POE001V1 with the third generation IEEE 802.3bt PoE standard, able to support applications up PoE/PoE + PD systems to 100 W. IEEE802.3bt PoE-PD The PoE-PD interface is based on the PM8805 system in package featuring two interface with integrated PM8805 embedded active bridges with driving circuitry, a charge pump to drive the high side dual-active bridge MOSFETs, a hot swap MOSFET and a standard single-signature interface compliant with IEEE 802.3bt, including detection, classification, UVLO and inrush current limitation. The device implements IEEE 802.3bt physical layer classification schemes to signal successful PSE type identification to the system: it identifies a 4-pair PSE by monitoring the Ethernet cable pairs and providing the system with a dedicated matrix of Tx signals. The PM8805 is suitable for building the interface for PoE switch mode power supplies for maximum conversion efficiency, with a PGD signal that can be used to enable downstream DC-DC converters or LED drivers with suitable electrical parameters. DB3668 - Rev 4 - May 2019 www.st.com For further information contact your local STMicroelectronics sales office.STEVAL-POE001V1 Overview 1 Overview Table 1. Pin descriptions Pin Name Function TPI VOUT Source of the High Side, hot swap MOSFET. This voltage can be used as input voltage for a DC/DC converter. TP2 GND Negative output of the active bridge High voltage rating, open drain output signal to be used as Enable for a DC/DC converter feed with VOUT voltage. It is pulled down until the PoE voltage is below UVLO and the hot Swap MOSFET is completely closed. TP3 PGD An 85 ms delay (typ.) is required when receiving power from a PSE before this signal is asserted. A pullup resistor of 100k to VOUT is mounted on-board. Table 2. LED descriptions Ref. Type Function Logic D11 Green LED Monitor of T2 signal LED on when T2 low D12 Green LED Monitor of T1 signal LED on when T1 low D13 Green LED Monitor of T0 signal LED on when T0 low D2 Blue LED Monitor of PGD signal LED on when PGD high 1.1 Recommended operating conditions Table 3. Recommended operating conditions Parameter Min. Max. Unit PoE input voltage range VOB to AGND 40 57 V Output current from VOUT signal pins - 2 A Input current for each INxx pair signals - 1 A Ambient temperature 0 50 C A load on output connector can only be applied after the PGD jumps to the high level. During the startup sequence, a load connected directly on the output connector will draw a portion of the charging current. If the load applied is higher than the first current limitation step (about 20 mA, also depending on Vin), the application cannot start. The board has embedded overload protection, but it is not protected against strong short-circuits on the output terminals. Overall peak efficiency: > 97% at 2 A. DB3668 - Rev 4 page 2/6