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TPS23754PWP-1
IEEE 802.3at PoE Interface and Isolated Converter Controller
COUT
DVC1
GATE
CINCTL
DEN
T2P
RT2P-OUT
Type 2 PSEIndicator
VOUT
GAT2
RT2P
LOUTVC
CIO
DVC2
VT2P-OUT
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Design
TPS23754, TPS23754-1, TPS23756SLVS885I –OCTOBER 2008–REVISED DECEMBER 2017
TPS2375x IEEE 802.3at, High Efficiency, PoE Interface and DC-DC Controller Features Powersupto 30-W (Input) PDs DC-DC Control Optimized for Isolated Converters Supports High-Efficiency Topologies Complete PoE Interface Enhanced Classification per IEEE 802.3at With
Status Flag Adapter ORing Support Programmable Frequency With Synchronization Robust 100-V, 0.5-Ω Hotswap MOSFET –40°Cto 125°C Junction Temperature Range Industry Standard PowerPAD™ HTSSOP-20
Applications IEEE 802.3at Compliant Devices Video and VoIP Telephones RFID Readers Multiband Access Points Security Cameras
DescriptionThe TPS23754 and TPS23756 devices havea
combined power-over-ethernet (PoE), powered-
device (PD) interface, and current-mode DC-DC
controller optimized specifically for isolated
converters. The PoE interface supports the IEEE
802.3at standard.
The TPS23754 and TPS23756 supporta numberof
input voltage ORing options including highest voltage,
external adapter preference, and PoE preference.
These features allow the designerto determine which
power source will carry the load underall conditions.
The PoE interface features the new extended
hardware classification necessary for compatibility
with high-power midspan power sourcing equipment
(PSE) per IEEE 802.3at. The detection signature pin
can alsobe usedto force power from the PoE source
off. Classification can be programmedto anyof the
defined types witha single resistor.
The DC-DC controller features two complementary
gate drivers with programmable dead time. This
simplifies the design of active-clamp forward
convertersor optimized gate drive for highly-efficient
flyback topologies. The second gate driver may be
disabledif desired for single MOSFET topologies.
The controller also features internal soft start,
bootstrap start-up source, current-mode
compensation, anda 78% maximum duty cycle.A
programmable and synchronizable oscillator allows
design optimization for efficiency and eases useof
the controller to upgrade existing power supply
designs. Accurate programmable blanking, with
default period, simplifies the usual current-sense
design trade-offs.
The TPS23754 device hasa 15-V converter start-up
while the TPS23756 device hasa 9-V converter start-
up. The TPS23754-1 replaces the PPD pin witha no-
connectfor increased pin spacing.
(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
High-Efficiency Converter Using TPS23754
