PM8800ATR datasheet(1/35 Pages) STMICROELECTRONICS

Numer części	PM8800ATR

Szczegółowy opis	Integrated IEEE 802.3af compliant PoE-PD interface and PWM controller with support of external source

PDF	35 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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1 / 35 page

February 2008

Rev 2

1/35

35

PM8800A

Integrated IEEE 802.3af compliant PoE-PD interface

and PWM controller with support of external source

Features

■ IEEE 802.3af compliant PD interface

■ Works with power supplied from Ethernet LAN

cables or from local auxiliary sources

■ Integrated 100 V, 0.5 Ω, 800 mA hot-swap

MOSFET

■ Integrated signature resistor

■ Programmable in-rush current limit

■ Programmable classification current

■ Programmable DC current limit up to 800 mA

■ High voltage start-up bias regulator

■ Thermal shutdown protection

■ Current mode pulse width modulator

■ Programmable oscillator frequency

■ Programmable soft-start

■ Power good indication

■ 80 % maximum duty cycle with internal slope

compensation

■ Supports both isolated and non-isolated

Applications.

■ HTSSOP16 package

Applications

■ VoIP phones, WLAN access points

■ Security cameras

■ PoE powered device appliances

■ High power (>12.95 W) powered devices

Description

The PM8800A integrates a standard 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 interface incorporates all the functions

required by the IEEE 802.3af including detection,

classification, under-voltage lockout (UVLO) and

in-rush current limitation.

PM8800A specifically targets PD with extended

power requirement with respect to the limit

imposed by the 802.3af standard, embedding a

hot-swap MOSFET capable of sustaining twice

the current of the 802.3af standard with a

programmable DC current limit.

The integrated switching regulator has been

designed to work with power either form the

Ethernet cable connection or from an external

power source such as AC adapter.

The DC-DC section of the PM8800A features a

programmable oscillator frequency, soft-start,

slope compensation and embeds a voltage output

error amplifier allowing use in both isolated and

non isolated configuration.

HTSSOP16

Table 1.

Device summary

Order codes

Package

Packing

PM8800A

HTSSOP16

Tube

PM8800ATR

HTSSOP16

Tape and reel

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Podobny numer części - PM8800ATR

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STMicroelectronics	PM8800A	216Kb / 10P	Integrated IEEE 802.3af compliant PoE-PD interface and PWM controller with support of external source 17-Sep-2007

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Podobny opis - PM8800ATR

Producent	Numer części	Arkusz danych	Szczegółowy opis
STMicroelectronics	PM8800	216Kb / 10P	Integrated IEEE 802.3af compliant PoE-PD interface and PWM controller with support of external source 17-Sep-2007
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