AS1891 60/90W PoE PD Controller

PoE PD Controller

• Fully Integrated 60/90W PD controller
• Backwards compatible with Type 1 and Type 2 IEEE® 802.3af/at Compliant PD
• 60/90W power up can be controlled by PSE or AS1891
• AS1891 will control safe 60/90W delivery from “Dumb” sources
• 4-pair power detection & secondary side logic notification
• Automatic Type 1, Type2 & 60W PoE detection in HW & I2C Modes

Primary-Side DC-DC Controller

• High-efficiency DC-DC Controller with Digital Optimization
• Primary-Secondary High-voltage integrated Digital Isolation
• Programmable Primary Clock Frequency

Secondary-Side Power Outputs

• Programmable PWM Frequencies synched to External Clock
• Output #1: Sync Controller with programmable power-FET timing for high efficiency at both light and full load