PM8803

PM8803
High-efficiency, IEEE 802.3at compliant integrated PoE-PD interface and PWM controller, HTSSOP20, STM, RoHS

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The PM8803 integrates a standard compliant Power over Ethernet (PoE) interface and a current mode PWM controller to simplify the design of the power supply sections of all powered devices. The PoE/PoE+ interface incorporates all the functions required by the IEEE 802.3at including detection, classification, undervoltage lockout (UVLO) and in-rush current limitation.

Features:

• IEEE 802.3at compliant PD interface
• Works with power supplied from Ethernet LAN cables or from local auxiliary sources
• Successful IEEE802.3at Layer1 classification indicator
• Integrated 100 V, 0. 45 Ohm, 1 A hot-swap MOSFET
• Accurate 140 mA typ. inrush current level
• Programmable classification current
• Programmable DC current limit up to 1 A
• Integrated high-voltage startup bias regulator
• Thermal shutdown protection
• Current mode pulse width modulator
• Programmable oscillator frequency
• 80% maximum duty cycle with internal slope compensation
• Support for flyback, forward, forward active clamp, flyback with synchronous rectification

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