STMicroelectronics PM8803
The PM8803 integrates a 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 includes all functions required by the IEEE 802.3at as well as detection, classification, undervoltage lockout (UVLO) and inrush current limitation. The PM8803 specifically performs IEEE802.3at Layer 1 hardware classification, providing the system with an indication of Type 2 PSE successful detection.| Part No. | PM8803 |
|---|---|
| Datasheet | PM8803 Download |
| Manufacturer |  STMicroelectronics |
| Description | IEEE 802.3at compliant integrated PoE-PD interface and PWM controller |
| Buy | Stock & Price |
APPLICATIONS
● VoIP phones, WLAN AP● WiMAX CPEs
● Security cameras
● PoE/PoE+ powered device appliances
DESCRIPTION
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 Ω, 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 start-up 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 The PM8803 has been designed to work with power either from the Ethernet cable or from an external power source such as a wall adapter, ensuring the priority of the auxiliary source over the PoE. The DC-DC section of t...
