PM8803 datasheet(1/34 Pages) STMICROELECTRONICS

部件名	PM8803

功能描述	High-efficiency, IEEE 802.3at compliant integrated PoE-PD interface and PWM controller

PDF	34 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

1 / 34 page

This is information on a product in full production.

November 2012

Doc ID 018559 Rev 2

1/34

34

PM8803

High-efficiency, IEEE 802.3at compliant integrated PoE-PD

interface and PWM controller

Datasheet

− production data

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 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

Applications

■ VoIP phones, WLAN AP

■ WiMAX CPEs

■ Security cameras

■ PoE/PoE+ Powered Device appliances

Description

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.

The PM8803 specifically performs IEEE802.3at

Layer1 hardware classification, providing an

indication of Type 2 PSE successful detection to

the rest of the system.

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 prevalence of the auxiliary source with

respect to the PoE. The DC/DC section of the

PM8803 features a programmable oscillator

frequency, an adjustable slope compensation,

dual complementary low-side drivers,

programmable dead time and an internal

temperature sensor.

The PM8803 targets high-efficiency conversion at

all load conditions supporting flyback, forward,

forward with active clamp converters and

synchronous rectification.

HTSSOP20

Table 1.

Device summary

Part number

Package

Packing

PM8803

HTSSOP20

Tube

PM8803TR

HTSSOP20

Tape and reel

www.st.com

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