STEVAL-POE003V1 STMicroelectronics

STEVAL-POE003V1 Data brief 5V/20A, active clamp forward converter, Power Over Ethernet (PoE) - IEEE 802.3bt compliant reference design Features Features of PM8805 PoE-PD interface System in package integrating a double active bridge, hot-swap MOSFET and PoE-PD interface PoE-PD single-signature interface compliant with IEEE 802.3bt Detection and support of high power 4-pair applications 100 V N-Ch MOSFETs with 0.2 total path resistance for each active bridge Identifies which kind of PSE (standard or legacy) it is connected to and provides successful IEEE802.3.af/at/bt classification indication through a combination of the T0, T1 and T2 signals (open drain) VFQFPN43 8x8 mm with 6 exposed pads Features of 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 start up with settable time Soft turn off (optionally disabled) Dual 1Apk, low side complementary gate drivers GATE2 optionally turned off for reduced consumption 80% maximum duty cycle with internal slope compensation Product summary VFQFPN 3.0x3.0x1.0 16L 0.5 mm pitch high power PoE PD / 5 V WEEE compliant STEVAL- up to 20 A active clamp POE003V1 RoHS compliant forward evaluation board PWM peak current mode controller for PoE and PM8804 Description telecom systems This reference design represents a PoE Class 8 converter designed for high IEEE802.3bt PoE-PD efficiency conversion over a wide load range. It is based on the PM8805 PoE-PD interface with integrated PM8805 interface compliant with the IEEE802.3bt standard, and a DC-DC forward active dual-active bridge clamp converter driven by the PM8804 PWM controller. The PM8805 system on package device embeds two active bridges and an IEEE802.3bt compliant Powered Device (PD) interface. It can be used in all medium- to-high power 2P and 4P high efficiency PoE and PoE+ applications such as point of sales and retail logistics devices. The PM8804 PWM controller represents an integrated solution for a smart and efficient 48 V converter, including 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. DB3653 - Rev 2 - May 2019 www.st.com For further information contact your local STMicroelectronics sales office.STEVAL-POE003V1 Specifications 1 Specifications Table 1. Specifications Parameter Specs Classification Class 8 Vin at RJ45 connector (J1) From 41.2 to 57 V Iin at RJ45 connector (J1) 1.0 A max each pair Vout 5 V +/- 2% Iout 20 A total max Max ouput power 100 W max Efficiency overall peak > 92% 13 A Vin at frontal jack connector (J9) 48 V +/- 2 V Iin at frontal jack connector (J9) 2.0 A total max Vin at rear jack connector (J10) 48 V +/- 2 V Iin at rear jack connector (J10) 2.5 A total max Operating temperature 0 - 50 C 20 A full load DB3653 - Rev 2 page 2/12