IC CTRLR POE PD IEEE 20-HTSSOP

TPS23754PWP

Manufacturer Part NumberTPS23754PWP
DescriptionIC CTRLR POE PD IEEE 20-HTSSOP
ManufacturerTexas Instruments
TypePower over Ethernet Switch (PoE)
TPS23754PWP datasheet
 


Specifications of TPS23754PWP

ApplicationsRemote Peripherals (Industrial Controls, Cameras, Data Access)Internal Switch(s)Yes
Current Limit970mAVoltage - Supply0 V ~ 57 V
Operating Temperature-40°C ~ 125°CMounting TypeSurface Mount
Package / Case20-TSSOP (0.173", 4.40mm Width) Exposed PadMounting StyleSMD/SMT
For Use With296-24596 - EVAL MODULE FOR TPS23754-383296-24595 - EVAL MODULE FOR TPS23754-420Lead Free Status / RoHS StatusLead free / RoHS Compliant
Other names296-24369-5  
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www.ti.com
High Power/High Efficiency PoE Interface and DC/DC Controller
FEATURES
1
Powers up to 30 W (input) PDs
2
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°C to 125°C Junction Temperature Range
Industry Standard PowerPAD™ TSSOP-20
APPLICATIONS
IEEE 802.3at Compliant Devices
Video and VoIP Telephones
RFID Readers
Multiband Access Points
Security Cameras
DESCRIPTION
The TPS23754/6 is a combined Power over Ethernet
(PoE)
powered
device
(PD)
current-mode dc/dc controller optimized specifically
for isolated converters. The PoE interface supports
the IEEE 802.3at standard.
D
A
R
APD1
Optional
Interface
Figure 1. High Efficiency Converter Using TPS23754
1
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.
PowerPAD is a trademark of Texas Instruments.
2
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.
The TPS23754/6 supports a number of input voltage
ORing options including highest voltage, external
adapter preference, and PoE preference. These
features allow the designer to determine which power
source will carry the load under all 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 also be used to force power from the PoE source
off. Classification can be programmed to any of the
defined types with a single resistor.
The dc/dc controller features two complementary gate
drivers with programmable dead time. This simplifies
design
optimized gate drive for highly-efficient flyback
topologies. The second gate driver may be disabled if
desired for single MOSFET topologies. The controller
also features internal softstart, bootstrap startup
source, current-mode compensation, and a 78%
maximum
synchronizable oscillator allows design optimization
for efficiency and eases use of the controller to
upgrade existing power supply designs. Accurate
programmable blanking, with a default period,
simplifies the usual current-sense filter design
trade-offs.
interface
and
The TPS23754 has a 15 V converter startup while the
TPS23756 has a 9 V converter startup. The
TPS23754-1 replaces the PPD pin with a no-connect
for increased pin spacing.
C
C
T2P
DEN
D
R
T2P
CLS
V
C
L
N/C OR PPD
VC
D
PAD
M1
V
V
C
B
SS
C
APD
GATE
M2
CTL
CS
FRS
GAT2
C
CL
D
CL
R
DT
TPS23754-1
SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009
of
active-clamp
forward
converters
duty
cycle.
A
programmable
IO
T1
V
OUT
IN
L
M4
OUT
R
T2P-OUT
VC1
C
V
OUT
M3
T2P-OUT
VC2
Type 2 PSE
Indicator
V
R
B
OB
C
CTL
R
C
CTL
IZ
TLV431
Copyright © 2008–2009, Texas Instruments Incorporated
TPS23754
TPS23756
or
and

TPS23754PWP Summary of contents

  • Page 1

    ... 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. PowerPAD is a trademark of Texas Instruments. 2 PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty ...

  • Page 2

    ... DUTY STATUS CYCLE TPS23754PWP Active 0–78% TPS23754PWP-1 Active 0–78% TPS23756PWP Active 0–78% (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www ...

  • Page 3

    ... Operating current Bootstrap startup time μF VC Startup current source - Voltage (1) The hysteresis tolerance tracks the rising threshold for a given device. Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 ( DD1 θ θ (2) °C/W °C/W 1.4 32 ...

  • Page 4

    ... Copyright © 2008–2009, Texas Instruments Incorporated % °C °C ...

  • Page 5

    ... The hysteresis tolerance tracks the rising threshold for a given device. (2) These parameters are provided for reference only, and do not constitute part of TI's published specifications for purposes of TI's product warranty. Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 TEST CONDITIONS ...

  • Page 6

    ... EN &1.25V pa Common Circuits and fpd PoE Thermal Monitor 50mW sa 1.5V &1.2V ARTN den www.ti.com time Reg V B Ref GATE DT COM GAT2 T2P CLS T2 State t2 Eng. V DEN SS CONV. 400ms OFF Hotswap MOSFET RTN APD 4V Copyright © 2008–2009, Texas Instruments Incorporated ...

  • Page 7

    ... Active low output that indicates a PSE has performed the IEEE 802.3at type 2 hardware classification, PPD is active, or APD is active. Pad – – Connect to V Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 (TOP VIEW) TPS23754-1 20 T2P ...

  • Page 8

    ... Minimum may be reduced by pulsed loading. Serves as a catch-all default class. 243 137 90.9 63.4 Not allowed prior to IEEE 802.3at. Use to indicate a Type 2 PD (high power) device per IEEE 802.3at. www.ti.com to RTN by opening the hotswap DD1 NOTES Copyright © 2008–2009, Texas Instruments Incorporated (1) (2) ...

  • Page 9

    ... Gate drive output for the dc/dc converter’s main switching MOSFET. GATE’s phase turns the main switch on when it transitions high, and off when it transitions low. GATE is held low when the converter is disabled. Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 ) ...

  • Page 10

    ... V) OR (1.55 V ≤ V APD from the start of converter switching, and [V T2P will not effect it. T2P will become invalid if the converter goes back into recharge (inrush). T2P is referenced to ARTN and IN Copyright © 2008–2009, Texas Instruments Incorporated www.ti.com Figure 1, and driven enables the hotswap MOSFET, ...

  • Page 11

    ... V ) − PoE Voltage − V VDD VSS Figure 3. Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 pin, should be connected from protect against over-voltage transients for many applications clamped to a diode drop above RTN by the hotswap switch. ...

  • Page 12

    ... Submit Documentation Feedback '756 CONVERTER START TIME 160 140 120 100 100 120 −40 −20 G003 '756 CONVERTER STARTUP CURRENT 8. Copyright © 2008–2009, Texas Instruments Incorporated www.ti.com vs TEMPERATURE V = 10.2 V VDD1 VDD1 100 120 Junction Temperature - C J Figure VDD1 - 125 − V VDD1-RTN Figure 8 ...

  • Page 13

    ... V CTL − Controller Bias Voltage − Figure 11. Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 '754 CONTROLLER BIAS CURRENT 3500 GATE and GAT2 Open T = 25°C J 3000 2500 937 kHz 2000 1500 ...

  • Page 14

    ... FRS R = 34.6 k (484 kHz) W FRS R = 26.7 k (623 kHz) W FRS R = 21.5 k (766 kHz) W FRS R = 17.3 k (937 kHz) W FRS 100 120 T - Junction Temperature - °C J Figure 14. vs TEMPERATURE 100 120 T − Junction Temperature − Figure 16. Copyright © 2008–2009, Texas Instruments Incorporated G009 G011 ...

  • Page 15

    ... Dead Time Resistance - kW Figure 19. Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 265 450 400 260 350 255 300 250 250 200 245 150 240 = 49.9 kΩ ...

  • Page 16

    ... PD input voltage. The upper Shut- Normal Operation down 42.5 20 Normal Operation Figure 21. Operational States for PD Table 2 shows key operational limits broken out for the two www.ti.com 57 PI Voltage (V) Copyright © 2008–2009, Texas Instruments Incorporated ...

  • Page 17

    ... The state labeled Mark, which is drawn in dashed lines, is part of the new type 2 hardware class state machine. Mark Detection V MSR Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 PSE PSE STATIC PD INPUT OUTPUT VOLTAGE ...

  • Page 18

    ... The input diode bridge’s incremental resistance may be DD www.ti.com . IEEE 802.3at requires a minimum falls as the RTN SS Cvtr. Starts V VDD-VSS V RTN-VSS of 24.9 kΩ (1%), DEN Figure 23). After the first mark event, the -V voltage below the mark VDD VSS Copyright © 2008–2009, Texas Instruments Incorporated ...

  • Page 19

    ... T2P becomes valid within t starts adapter is plugged in while the PD is operating from a PSE. Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 determine the class the PD must advertise. The PSE may disconnect a CLS to avoid excessive power dissipation ...

  • Page 20

    ... IN RTN (the bootstrap startup VC UVLO C Figure 25, V continues to rise until VC rises. There is a slight delay VC from the start of switching, indicating – ~8.5 V CUV CUVH (V < ~1.5 V), or CTL CTL ZDC Copyright © 2008–2009, Texas Instruments Incorporated RTN ZDC ...

  • Page 21

    ... In addition, an internal slope-compensation ramp generator, frequency synchronization logic, thermal shutdown, and startup current source with control are provided. Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 rises above ~12 V for longer than ~400 μs, the current limit reverts to the ...

  • Page 22

    ... CSMAX when the converter is disabled DD1 and V must be minimal C B when the converter B regulator and internal B decreases DD1 to charge higher. DD1 ) to the PWM SLOPE × There is also a small dc SL-EX S Copyright © 2008–2009, Texas Instruments Incorporated S ...

  • Page 23

    ... The dc/dc controller has an OTSD that can be triggered by heat sources including the V bootstrap current source, and bias currents. The controller OTSD turns off V V control into an under-voltage state. C Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 Figure 1 and Figure 30. The synchronization pulse terminates the potential ) + (1.55 V < ...

  • Page 24

    ... Submit Documentation Feedback Optional for PoE Priority DEN CLS V SS RTN Adapter Adapter Option 2 Option 3 Figure 27. ORing Configurations Copyright © 2008–2009, Texas Instruments Incorporated www.ti.com Figure 27 illustrates three options for Low Voltage Output Power Circuit while in the operational state, SS ...

  • Page 25

    ... Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 capacitance charges, with a subsequent converter restart at the higher ...

  • Page 26

    ... RTN D VDD PPD DEN CLS program the classification current according to the IEEE 802.3at standard. = 63.4 Ω. CLS www.ti.com DD1 . VDD C VDD 0.01mF 0.05 μF to 0.12 μF. Typically SS between 23.75 kΩ and 26.25 kΩ, or DEN Copyright © 2008–2009, Texas Instruments Incorporated to ...

  • Page 27

    ... The FRS node should be protected from noise because it is high-impedance the order of 100 Ω in the isolated example reduces noise sensitivity and jitter. T Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 , R APD2 ...

  • Page 28

    ... S using R BLNK BLNK www.ti.com FRS 47pF (see S /T (peak ramp based SLOPE (in mV/period), is based on the full , and I are from the electrical SL-EX = 0.78). MAX (kΩ (ns). BLNK Copyright © 2008–2009, Texas Instruments Incorporated (6) ...

  • Page 29

    ... Using a typical bootstrap current of 4 mA, compute the time to startup 10.47 F ´ VC1 CUV ( Compute the fault duty cycle and hiccup frequency Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 ´ ´ 250 of 100 ns sizing and frequency of hiccup during a fault. The VC is rated to (often 10 V) ...

  • Page 30

    ... Bias Winding Figure 32. R Usage OUT C R T2P_OUT R T2P Type 2 PSE Indicator Low = T2 T2P From TPS23754 Figure 33. T2P Interface = 1 V T2P = 10 kΩ, V (low) = 400 mV max T2P-OUT www.ti.com 6 6. 32% = 39.9 Hz will be between 10 VC Copyright © 2008–2009, Texas Instruments Incorporated ...

  • Page 31

    ... APD hysteresis, allowing the PSE to power the load before V hotswap foldback. D PPD DEN CLS APD R APD1 Adapter Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 (low 10000 . A device with a minimum CTR of 300 T2P RT2P_OUT 100 = 0 0.625 mA ´ ...

  • Page 32

    ... They serve to control the output rate-of-rise by pulling the optocoupler, and D . This has the added advantage that the TL431 OB SS From Regulated Output Voltage FBU FBL TLV431 Figure 36. Error Amplifier Soft Start www.ti.com Figure 36 Figure 25 Copyright © 2008–2009, Texas Instruments Incorporated ...

  • Page 33

    ... TPS23754. Layout Printed circuit board layout recommendations are provided in the evaluation module (EVM) documentation available for these devices. Copyright © 2008–2009, Texas Instruments Incorporated SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009 lower threshold. This will occur during an output overload ...

  • Page 34

    ... chooses to power the PD To: A type 1 PSE will treat a class 4 device like a class 0 device, allotting 13W if it chooses to power the PD ........................................................................................................... • Added Using DEN to Disable PoE ...................................................................................................................................... 34 Submit Documentation Feedback REVISION HISTORY Copyright © 2008–2009, Texas Instruments Incorporated www.ti.com Page ...

  • Page 35

    ... Orderable Device Status TPS23754PWP ACTIVE TPS23754PWP-1 ACTIVE TPS23754PWPR ACTIVE TPS23754PWPR-1 ACTIVE TPS23756PWP ACTIVE TPS23756PWPR ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. ...

  • Page 36

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing TPS23754PWPR HTSSOP PWP TPS23754PWPR-1 HTSSOP PWP TPS23756PWPR HTSSOP PWP PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 20 2000 330.0 16.4 6.95 20 2000 330.0 16.4 6 ...

  • Page 37

    ... Device Package Type TPS23754PWPR HTSSOP TPS23754PWPR-1 HTSSOP TPS23756PWPR HTSSOP PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm) PWP 20 2000 PWP 20 2000 PWP 20 2000 Pack Materials-Page 2 12-Dec-2009 Width (mm) Height (mm) 346.0 346.0 33.0 346.0 346.0 33.0 346.0 346.0 ...

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  • Page 41

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...