Datasheet

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FEATURES

APPLICATIONS

DESCRIPTION

TPS2376-H

SMAJ58A

0.1mF

CLASS

DET

T1 A

Data to

Ether net

PHY

RJ-45

T1 B

287KW

ILIM

RTN

BULK

To DC/DC Converter

PAD

UVLO

1.62KW

23.2KW

TPS2376-H

SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006

IEEE 802.3af PoE HIGH POWER PD CONTROLLER

PRODUCT SELECTOR

• Adjustable Turn-on Thresholds

Rated

Device UVLO Protection Package

(1)

• Permits high-power 26 W designs

Current

• Integrated 0.58- Ω , 100-V, Low-Side Switch

TPS2376-H Adjustable Auto-Retry DDA 600 mA

TPS2375-1 802.3af Auto-Retry PW 400 mA

• 15-kV System Level ESD Capable

TPS2377-1 Legacy Auto-Retry D 400 mA

• Industrial Temperature Range: -40 ° C to 85 ° C

TPS2375 802.3af Latch PW, D 400 mA

• 8-Pin PowerPad™ SOIC Package

TPS2376 Adjustable Latch PW, D 400 mA

TPS2377 Legacy Latch PW, D 400 mA

• VoIP Video and Speaker Phones

• WiMAX Access Points

• Security Cameras

(1) Packages codes as follows: D = S0, DDA = SO PowerPad,

• RFID Readers PW = TSSOP

The 8-pin integrated circuit contains all of the features needed to develop a high power IEEE 802.3af style

powered device (PD). The TPS2376-H offers a higher current limit and increased thermal dissipation capability

over the TPS237X family of devices. The TPS2376-H implements a fully compliant PoE interface while

permitting non-standard implementations that draw more power. A 26 W PD may be constructed when working

from a 52 V minimum PSE over 100 m of CAT-5 cable. The TPS2376-H features a 100 V rating, 600 mA

capability, adjustable inrush limiting, fault protection with auto-retry, and true open-drain power-good

functionality.

Figure 1. Typical Application Circuit

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.

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.

Summary of content (23 pages)

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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 IEEE 802.3af PoE HIGH POWER PD CONTROLLER FEATURES • • • • • • PRODUCT SELECTOR Adjustable Turn-on Thresholds Permits high-power 26 W designs Integrated 0.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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TPS2376-H www.ti.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 ELECTRICAL CHARACTERISTICS (continued) V(VDD) = 48 V, R(DET) = 24.9 kΩ, R(CLASS) = 255 Ω, R(ILIM) = 287 kΩ, and –40°C ≤ TJ ≤ 125°C, unless otherwise noted. Positive currents are into pins. Typical values are at 25°C. All voltages are with respect to VSS unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT PG Voltage threshold rising (3) V(RTN) rising 9.5 10 10.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 DEVICE INFORMATION (continued) TPS2376-H (TOP VIEW) 1 ILIM VDD 2 CLASS UVLO 3 DET PG VSS RTN 4 8 7 6 5 TERMINAL FUNCTIONS PIN NUMBER '76-H I/O DESCRIPTION ILIM 1 O Connect a resistor from ILIM to VSS to set the start-up inrush current limit. The equation for calculating the resistor is shown in the detailed pin description section for ILIM.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 Table 1. CLASSIFICATION - IEEE 802.3af values CLASS PD POWER (W) R(CLASS) (Ω) 802.3af LIMITS (mA) 0 0.44 – 12.95 4420 ±1% 0-4 1 0.44 – 3.84 953 ±1% 9 - 12 2 3.84 – 6.49 549 ±1% 17 - 20 3 6.49 – 12.95 357 ±1% 26 - 30 4 - 255 ±1% 36 - 44 NOTE Default class Reserved for future use DET: R(DET) should be connected between VDD and the DET pin when it is used.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 TYPICAL CHARACTERISTICS Graphs over temperature are interpolations between the marked data points. I(VDD) + I(RTN) IN DETECTION 35 5 30 o Resistance − k Ω TJ = 125 C 4 3 11.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 TYPICAL CHARACTERISTICS (continued) Graphs over temperature are interpolations between the marked data points. CURRENT LIMIT vs TEMPERATURE 780 I(RTN) − CURRENT LIMIT − mA 778 776 774 772 770 768 766 764 762 760 −40 −20 0 20 40 60 80 100 120 TJ − Junction Temperature − °C Figure 11.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 APPLICATION INFORMATION OVERVIEW The IEEE 802.3af specification defines a process for safely providing power over an ethernet cable when a capable device is connected, and then removing power if it is disconnected. The process proceeds through three operational states: detection, classification, and operation. An unterminated cable is not powered.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 APPLICATION INFORMATION (continued) INTERNAL THRESHOLDS Operational Mode In order to implement the defined PoE functions shown in Figure 12, the TPS2376-H has a number of internal comparators with hysteresis for stable switching between the various states. Figure 13 relates the parameters in the Electrical Characteristics section to the PoE states.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 APPLICATION INFORMATION (continued) PROGRAMMABLE INRUSH CURRENT LIMIT AND FIXED OPERATIONAL CURRENT LIMIT Inrush limiting has several benefits. First, it maintains the cable voltage above the UVLO turn-off threshold as the bulk capacitor charges. Second, it keeps the PSE from going into current limit. This reduces stress on the PSE and allows an arbitrarily large bulk capacitor to be charged.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 APPLICATION INFORMATION (continued) The PG pin can be left open if it is not used. DC/DC CONVERTER STARTUP The PSE and TPS2376-H are power and current limited sources, which imposes certain constraints on the PD power supply design. Improper design of the system can prevent PD startup with some combinations of Ethernet lines and PSE sources. The root of most startup problems revolves around the dc/dc converter.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 APPLICATION INFORMATION (continued) Inserting a Diode in This Location With Option 2, Allows PoE To Start With Aux Power Present. ~ + VDD R (DET) 0.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 APPLICATION INFORMATION (continued) ESD The TPS2376-H has been tested using the surge of EN61000-4-2 in evaluation circuit similar to Figure 1. The levels used were 8-kV contact discharge and 15-kV air discharge. Surges were applied between the RJ-45 and the outputs, and between an auxiliary power input jack and the dc outputs. No failures were observed.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 APPLICATION INFORMATION (continued) Load Capacitor The IEEE 802.3af specification requires that the PD maintain a minimum load capacitance of 5 µF. A PD can fail the dc MPS requirement if the load current to capacitance ratio is too small. This is caused by having a long input current dropout after a drop in input voltage. The PD should begin to draw input current within 300 ms of an abrupt 13 V input droop.
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TPS2376-H www.ti.com SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006 APPLICATION INFORMATION (continued) UVLO DIVIDER TVS VDD COPPER FILL OUTPUT CAPACITOR R(ILM) 0.01 mF R(CLASS) R(DET) VSS COPPER FILL TPS2376-H RTN COPPER FILL Figure 15.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 13-Dec-2011 TAPE AND REEL INFORMATION *All dimensions are nominal Device TPS2376DDAR-H Package Package Pins Type Drawing SO Power PAD DDA 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.4 B0 (mm) K0 (mm) P1 (mm) 5.2 2.1 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 13-Dec-2011 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS2376DDAR-H SO PowerPAD DDA 8 2500 358.0 335.0 35.
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