M1

C

OUT

D

VC1

GATE

V

C

CS

CTL

V

B

V

SS

C

IN

R

CTL

C

CTL

CLS

DEN

FRS

T2P

R

T2P-OUT

Type2PSE

Indicator

V

B

TLV431

R

OB

C

IZ

V

OUT

PAD

GAT2

M2

D

CL

C

CL

C

C

M4

M3

R

T2P

D

A

R

APD1

N/CORPPD

APD

R

DT

L

OUT

L

VC

T1

C

IO

D

VC2

Optional

Interface

V

T2P-OUT

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

Reference

Design

TPS23754, TPS23754-1, TPS23756

SLVS885H – OCTOBER 2008 – REVISED OCTOBER 2015

TPS2375x High-Power/High-Efficiency PoE Interface

and DC-DC Controller

1

1 Features

The

PoE

interface

features

the

new

extended

•

Powers up to 30-W (Input) PDs

hardware classification necessary for compatibility

•

DC-DC Control Optimized for Isolated Converters

with high-power midspan power sourcing equipment

•

Supports High-Efficiency Topologies

(PSE) per IEEE 802.3at. The detection signature pin

•

Complete PoE Interface

can also be used to force power from the PoE source

off. Classification can be programmed to any of the

•

Enhanced Classification per IEEE 802.3at With

defined types with a single resistor.

Status Flag

The DC-DC controller features two complementary

•

Adapter ORing Support

gate drivers with programmable dead time. This

•

Programmable Frequency With Synchronization

simplifies

the

design

of

active-clamp

forward

•

Robust 100-V, 0.5-

Ω Hotswap MOSFET

converters or optimized gate drive for highly-efficient

•

–40°C to 125°C Junction Temperature Range

flyback topologies. The second gate driver may be

disabled if desired for single MOSFET topologies.

•

Industry Standard PowerPAD™ HTSSOP-20

The

controller

also

features

internal

soft

start,

bootstrap

start-up

source,

current-mode

2 Applications

compensation, and a 78% maximum duty cycle. A

•

IEEE 802.3at Compliant Devices

programmable and synchronizable oscillator allows

design optimization for efficiency and eases use of

•

Video and VoIP Telephones

the controller to upgrade existing power supply

•

RFID Readers

designs. Accurate programmable blanking, with a

•

Multiband Access Points

default period, simplifies the usual current-sense filter

design trade-offs.

•

Security Cameras

The TPS23754 device has a 15-V converter start-up

3 Description

while the TPS23756 device has a 9-V converter start-

The TPS23754 and TPS23756 devices have a

up. The TPS23754-1 replaces the PPD pin with a no-

combined

power-over-ethernet

(PoE),

powered-

connect for increased pin spacing.

device (PD) interface, and current-mode DC-DC

controller

optimized

specifically

for

isolated

Device Information(1)

converters. The PoE interface supports the IEEE

PART NUMBER

PACKAGE

BODY SIZE (NOM)

802.3at standard.

TPS23754

The TPS23754 and TPS23756 support a number of

TPS23754-1

HTSSOP (20)

6.50 mm × 4.40 mm

input voltage ORing options including highest voltage,

TPS23756

external adapter preference, and PoE preference.

(1) For all available packages, see the orderable addendum at

These features allow the designer to determine which

the end of the data sheet.

power source will carry the load under all conditions.

High-Efficiency Converter Using TPS23754

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.