STEVAL-POE006V1 Data brief 3.3V/20A, active clamp forward converter, Power Over Ethernet (PoE) IEEE 802.3bt compliant reference design Features Features of the PM8805 PoE-PD interface: System in package integrating a double active bridge, a hot-swap MOSFET and a PoE-PD Supports legacy 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 IEEE 802.3af/at/bt classification indication as a combination of the T0, T1 and T2 signals (open drain) Smart operation mode selection through the STBY, FAUX and RAUX control signals QFN 56 8x8mm package with 43 pins and 6 exposed pads Features of the 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 startup with settable time Soft turn off (optionally disabled) Dual 1 A , low side complementary gate drivers PK GATE2 can be turned off for reduced consumption Product summary 80% maximum duty cycle with internal slope compensation High power PoE PD, 3 V QFN 16 3x3mm package with exposed pad STEVAL- up to 20 A active clamp POE006V1 forward evaluation board Description PWM peak current mode controller for PoE and PM8804 This reference design represents a 3.3 V, 20 A converter solution ideal for various telecom systems applications including wireless access points, supplied with a PoE-PD interface and a IEEE802.3bt PoE-PD DC-DC active clamp forward converter. interface with integrated PM8805 The PoE-PD interface is based on the PM8805 system in package device with two dual-active bridge active bridges and an IEEE 802.3bt compliant Powered Device (PD) interface. It can be used in all medium-to-high power 2P and 4P high efficiency PoE and PoE+ applications. The DC-DC active clamp forward converter is designed around the PM8804 PWM controller, which is an integrated solution for smart and efficient 48 V converters, featuring 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. DB3669 - Rev 3 - June 2019 www.st.com For further information contact your local STMicroelectronics sales office.STEVAL-POE006V1 STEVAL-POE006V1 schematic diagrams 1 Schematic diagrams Figure 1. STEVAL-POE006V1 circuit schematic (1 of 3) DB3669 - Rev 3 page 2/5