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TPS2375 Datasheet

  • TPS2375

  • IEEE 802.3af PoE 有源器件控制器

  • 106.00KB

  • 24页

  • TI

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www.ti.com
TPS2375
TPS2376
TPS2377
SLVS525A 鈥?APRIL 2004 鈥?REVISED SEPTEMBER 2004
IEEE 802.3af PoE POWERED DEVICE CONTROLLERS
FEATURES
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Fully Supports IEEE 802.3af Specification
Integrated 0.58-鈩? 100-V, Low-Side Switch
15-kV System Level ESD Capable
Supports Use of Low-Cost Silicon Rectifiers
Programmable Inrush Current Control
Fixed 450-mA Current Limit
Fixed and Adjustable UVLO Options
Open-Drain, Power-Good Reporting
Overtemperature Protection
Industrial Temperature Range: -40掳C to 85掳C
8-Pin SOIC and TSSOP Packages
APPLICATIONS
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VoIP Phones
WLAN Access Points
Security Cameras
Internet Appliances
POS Terminals
TPS2375/77
(TOP VIEW)
1
2
3
4
ILIM
CLASS
DET
VSS
VDD
N/C
PG
8
7
6
1
2
3
4
TPS2376
(TOP VIEW)
ILIM
CLASS
DET
VSS
VDD
UVLO
PG
8
7
6
RTN 5
RTN 5
DESCRIPTION
These easy-to-use 8-pin integrated circuits contain all of the features needed to develop an IEEE 802.3af
compliant powered device (PD). The TPS2375 family is a second generation PDC (PD Controller) featuring
100-V ratings and a true open-drain, power-good function.
In addition to the basic functions of detection, classification and undervoltage lockout (UVLO), these controllers
include an adjustable inrush limiting feature. The TPS2375 has 802.3af compliant UVLO limits, the TPS2377 has
legacy
UVLO limits, and the TPS2376 has a programmable UVLO with a dedicated input pin.
The TPS2375 family specifications incorporate a voltage offset of 1.5 V between its limits and the IEEE 802.3af
specifications to accommodate the required input diode bridges used to make the PD polarity insensitive.
Additional resources can be found on the TI Web site www.ti.com.
RJ鈭?5
1
TX
Pair
Data to
Ethernet
PHY
Detect
Classify Power Up & Inrush
2
SMAJ58A
R
(DET)
24.9 kW,
1%
DET
ILIM
R
(ILIM)
178 kW,
1%
CLASS
R
(ICLASS)
357 W,
1%
VDD
DF01S
2 Places
Input
Current
100
kW
TO DC/DC
CONVERTER
PG
TPS2375
Class 3
Current
V (PG-RTN)
4
5
Spare
Pair
7
8
0.1mF,
100 V
10 %
100 mF,
100 V
RTN
VDD
VRTN
Spare
Pair
3
RX
Pair
6
Data to
Ethernet PHY
Note: Class 3 PD Depicted.
PG Pullup Resistor Is Optional.
VSS
Note: All Voltages With Respect to VSS.
Figure 1. Typical Application Circuit and Startup Waveforms
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright 漏 2004, Texas Instruments Incorporated

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