TPS23754EVM-383 - Texas Instruments

User's Guide

SLVU304C–April 2009–Revised November 2011

TPS23754EVM-383 EVM: Evaluation Module for TPS23754

This User’s Guide describes the TPS23754 EVM (TPS23754EVM-383). TPS23754EVM-383 contains

evaluation and reference circuitry for the TPS23754. The TPS23754 is an IEEE 802.3at compliant

powered device (PD) controller and power supply controller optimized for isolated converter topologies.

TPS23754EVM-383 is targeted at 25W, active clamp, forward converter applications.

Contents

1 Description ................................................................................................................... 2

1.1 Features ............................................................................................................. 2

1.2 Applications ......................................................................................................... 2

2 Electrical Specifications .................................................................................................... 2

3 Schematic .................................................................................................................... 3

4 General Configuration and Description .................................................................................. 4

4.1 Physical Access .................................................................................................... 4

5 Test Setup ................................................................................................................... 5

6 TPS23754EVM-383 Typical Performance Data ........................................................................ 5

6.1 12V DC/DC Efficiency ............................................................................................. 5

6.2 TPS23754EVM-383 Conducted Emissions ..................................................................... 6

7 EVM Assembly Drawings and Layout Guidelines ...................................................................... 6

7.1 PCB Drawings ...................................................................................................... 6

7.2 Layout Guidelines .................................................................................................. 8

7.3 EMI Containment ................................................................................................... 9

8 Bill of Materials ............................................................................................................. 10

List of Figures

1 TPS23754EVM-383 Schematic........................................................................................... 3

2 Typical TPS23754EVM-383 Test Setup ................................................................................. 5

3 TPS23754EVM-383 Efficiency With 12V Output ....................................................................... 5

4 TPS23754EVM-383 Conducted Emissions.............................................................................. 6

5 Top Side Layout/Routing................................................................................................... 6

6 Layer Two Routing.......................................................................................................... 7

7 Layer Three Routing........................................................................................................ 7

8 Bottom Side Placement/Routing .......................................................................................... 8

List of Tables

1 TPS23754EVM-383 Electrical and Performance Specifications...................................................... 2

2 Connector Functionality.................................................................................................... 4

3 Test Points................................................................................................................... 4

4 TPS23754EVM-383 Bill of Materials ................................................................................... 10

SLVU304C–April 2009–Revised November 2011 TPS23754EVM-383 EVM: Evaluation Module for TPS23754

Description

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1 Description

TPS23754EVM-383 will allow reference circuitry evaluation of the TPS23754. It contains input and output

power connectors and an array of on board test points for circuit evaluation. A synchronous flyback, 5V,

25W EVM is also available, see SLVU301.

1.1 Features

•Efficient, general market design

–Self driven, synchronous rectified secondary

–25w output power from power over ethernet (POE), 30W output power from a 48V adapter

–Operates from either POE or external adaptors (48V)

–12V output voltage

1.2 Applications

•Voice over Internet Protocol –IP telephones

•Wireless LAN –Wireless Access Points

•Security –Wired IP cameras

2 Electrical Specifications

Table 1. TPS23754EVM-383 Electrical and Performance Specifications

Parameter Condition Min Typ Max Units

Power Interface

Input voltage Applied to the power pins of connectors J1 or J3 0 57 V

Operating Voltage After start up 30 57 V

Rising input voltage 36

Input UVLO V

Falling input voltage 30

Detection voltage At device terminals 1.6 10 V

Classification voltage At device terminals 10 23 V

Classification current Rclass = 63.4 Ω36 44 mA

Inrush current-limit 100 180 mA

Operating current-limit 850 1100 mA

DC/DC Converter

Output voltage 33 V ≤Vin ≤57 V, ILOAD ≤ILOAD (max) 12 V output V

Output current 33 V ≤Vin ≤57 V 12 V output 2.5 Amps

Output ripple voltage, peak-to-peak Vin = 44 V, ILOAD = 2.5 A 12 V output 100 mV

Efficiency, end-to-end Vin = 44 V, ILOAD = 2.5 A 12 V output 87%

Switching frequency 225 275 kHz

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Schematic

3 Schematic

Figure 1. TPS23754EVM-383 Schematic

SLVU304C–April 2009–Revised November 2011 TPS23754EVM-383 EVM: Evaluation Module for TPS23754

General Configuration and Description

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4 General Configuration and Description

4.1 Physical Access

Table 2 lists the TPS23754EVM-383 connector functionality and Table 3 describes the test point

availability.

Table 2. Connector Functionality

Connector Label Description

J1 ADAPTER External adapter input. J7 (low side) and J8 (high side) can select weather the adapter is at

the PD controller input (VDD to VSS) or at the converter input (VDD1 to RTN). J6 is used

to select PPD or APD function.

J2 VOUT Output voltage connector

J3 DATA + PoE POWER Ethernet power input connector. Contains Ethernet transformer and cable terminations

J4 DATA PORT Ethernet data port connector

J5 EGND Earth GND connection

Table 3. Test Points

Test Point Color Label Description

TP3, TP17, TP18 BLK GND Secondary side (output) grounds (GND)

TP5 RED VC DC/DC converter bias supply

TP6 ORG DRAIN Drain terminal of the primary side switching MOSFET

TP10 BLK VSS POE input, low side

TP12, TP16 BLK RTN DC/DC converter return

TP14 ORG LOOP Can be used with TP13 for overall feedback loop measurements.

TP13 RED VOUT DC/DC converter output voltage.

TP15 WHT CTL Control loop input to the pulse width modulator

TP9 WHT RCS DC/DC converter primary side switching MOSFET current sense (resistor side).

TP11 RED VB Bias voltage regulator

TP8 WHT GATE Gate drive for the primary side switching MOSFET

TP7 WHT GAT2 Gate drive for the primary side active clamp MOSFET

TP4 RED PVDD1 Transformer primary high side.

TP23 WHT T2P Type 2 PSE output from TPS23754

TP1 WHT PPD Connected to PPD pin of TPS23754

TP2 WHT APD Connected to APD pin of TPS23754

TP20 RED P78 Pair 7,8

TP21 ORG P12 Pair 1,2

TP19 ORG P45 Pair 4,5

TP22 RED P36 Pair 3,6

D21 GRN T2P Type 2 PSE indicator. Remove the shunt on J9 to inhibit the T2P indicator.

D12 RED POWER ON Output power indicator. Remove the shunt on J10 to inhibit the output power

indicator.

Provides a connection between VDD and VDD1 shorting out D3. Removing the short

CL1 N/A CL1 at CL1 allows certain power source priority schemes to be tested.

4TPS23754EVM-383 EVM: Evaluation Module for TPS23754 SLVU304C–April 2009–Revised November 2011

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PSE

PowerSupply

DatatoPHY

(EthernetCable )

AUX

PowerSource

DUT

TPS 23754 EVM -383

VOUT GND

- +

RLOAD

0 0.5 1 1.5 2 2.5

I -OutputCurrent- A

PoE48V

Converter48V

Adapter48V

Efficiency-%

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Test Setup

5 Test Setup

Figure 2 shows a typical test setup for TPS23754EVM-383. Input voltage can be applied as described in

Table 2.

Figure 2. Typical TPS23754EVM-383 Test Setup

6 TPS23754EVM-383 Typical Performance Data

6.1 12V DC/DC Efficiency

Figure 3 illustrates three different 48VDC input efficiency plots:

1. PoE, 48V from J3

2. Converter only 48V

3. Adapter 48V from J1

Figure 3. TPS23754EVM-383 Efficiency With 12V Output

SLVU304C–April 2009–Revised November 2011 TPS23754EVM-383 EVM: Evaluation Module for TPS23754

ClassBQuasi-PeakLimit

ClassB AverageLimit

HPA383 (TPS23754PWP)

12V / 2A Output

EVM Assembly Drawings and Layout Guidelines

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6.2 TPS23754EVM-383 Conducted Emissions

Figure 4. TPS23754EVM-383 Conducted Emissions

7 EVM Assembly Drawings and Layout Guidelines

7.1 PCB Drawings

The following figure shows component placement and layout.

Figure 5. Top Side Layout/Routing

6TPS23754EVM-383 EVM: Evaluation Module for TPS23754 SLVU304C–April 2009–Revised November 2011

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EVM Assembly Drawings and Layout Guidelines

Figure 6. Layer Two Routing

Figure 7. Layer Three Routing

SLVU304C–April 2009–Revised November 2011 TPS23754EVM-383 EVM: Evaluation Module for TPS23754

EVM Assembly Drawings and Layout Guidelines

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Figure 8. Bottom Side Placement/Routing

7.2 Layout Guidelines

The layout of the PoE front end should follow power and EMI/ESD best practice guidelines. A basic set of

recommendations include:

•Parts placement must be driven by power flow in a point-to-point manner; RJ-45, Ethernet transformer,

diode bridges, TVS and 0.1-μF capacitor, and TPS23754 converter input bulk capacitor.

•All leads should be as short as possible with wide power traces and paired signal and return.

•There should not be any crossovers of signals from one part of the flow to another.

•Spacing consistent with safety standards like IEC60950 must be observed between the 48-V input

voltage rails and between the input and an isolated converter output.

•The TPS23754 should be located over split, local ground planes referenced to VSS for the PoE input

and to RTN for the converter. Whereas the PoE side may operate without a ground plane, the

converter side must have one. Logic ground and power layers should not be present under the

Ethernet input or the converter primary side.

•Large copper fills and traces should be used on SMT power-dissipating devices, and wide traces or

overlay copper fills should be used in the power path.

The DC/DC Converter layout can benefit from basic rules such as:

•Pair signals to reduce emissions and noise, especially the paths that carry high-current pulses which

include the power semiconductors and magnetics.

•Minimize trace length of high current, power semiconductors, and magnetic components.

•Where possible, use vertical pairing.

•Use the ground plane for the switching currents carefully.

•Keep the high-current and high-voltage switching away from low-level sensing circuits including those

outside the power supply.

•Pay special attention to spacing around the high-voltage sections of the converter.

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EVM Assembly Drawings and Layout Guidelines

7.3 EMI Containment

•Use compact loops for dv/dt and di/dt circuit paths (power loops and gate drives)

•Use minimal, yet thermally adequate, copper areas for heat sinking of components tied to switching

nodes (minimize exposed radiating surface).

•Use copper ground planes (possible stitching) and top layer copper floods (surround circuitry with

ground floods)

•Use 4 layer PCB if economically feasible (for better grounding)

•Minimize the amount of copper area associated with input traces (to minimize radiated pickup)

•Hide copper associated with switching nodes under shielded magnetics where possible

•Heat sink the “quiet side”of components instead of the “switching side”where possible (like the output

side of inductor)

•Use Bob Smith terminations, Bob Smith EFT capacitor, and Bob Smith plane

•Use Bob Smith plane as ground shield on input side of PCB (creating a phantom or literal earth

ground)

•Use LC filter at DC/DC input

•Dampen high frequency ringing on all switching nodes if present (allow for possible snubbers)

•Control rise times with gate drive resistors and possibly snubbers

•Switching frequency considerations

•Use of EMI bridge capacitor across isolation boundary (isolated topologies)

•Observe the polarity dot on inductors (embed noisy end)

•Use of ferrite beads on input (allow for possible use of beads or 0 ohm resistors)

•Maintain physical separation between input-related circuitry and power circuitry (use ferrite beads as

boundary line)

•Balance efficiency vs. Acceptable noise margin

•Possible use of common-mode inductors

•Possible use of integrated RJ-45 jacks (shielded with internal transformer and Bob Smith terminations)

•End-product enclosure considerations (shielding)

SLVU304C–April 2009–Revised November 2011 TPS23754EVM-383 EVM: Evaluation Module for TPS23754

Bill of Materials

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8 Bill of Materials

Table 4. TPS23754EVM-383 Bill of Materials

Count RefDes Value Description Size Part Number MFR

1 C1 0.047 μF Capacitor, Ceramic, 250V, X7R, 10% 1206 Std Std

3 C10, C23, C24 0.1 μF Capacitor, Ceramic, 100V, X7R, 10% 0805 Std Std

1 C11 100 μF Capacitor, Aluminum, 16V, 20%, FK Series 0.217 ×0.169 EEVFK1C101P Panasonic

1 C12 22 μF Capacitor, Ceramic, 16-V, X7R, 20% 1210 C3225X7R1C226MT TDK

1 C13 1.0 μF Capacitor, Ceramic, 25V, X7R, 10% 0805 Std Std

1 C14 22 μF Capacitor, Aluminum, 25V, 20% 5×5.8mm EEVFK1E220R Panasonic

1 C15 47 pF Capacitor, Ceramic, 50V, X7R, 10% 0603 Std Std

1 C16 1.0 μF Capacitor, Ceramic, 16V, X7R, 10% 0603 Std Std

1 C17 22 nF Capacitor, Ceramic, 50V, X7R, 10% 0603 Std Std

1 C18 10 pF Capacitor, Ceramic, 50V, C0G, 5% 0603 Std Std

1 C19 15 nF Capacitor, Ceramic, 50V, X7R, 10% 0603 Std Std

1 C2 1 μF Capacitor, Ceramic, 16V, X7R, 20% 0603 C1608X7R1C105M TDK

1 C20 1 μF Capacitor, Ceramic, 16V, X7R, 10% 0805 Std Std

1 C21 1000 pF Capacitor, Ceramic, 2kV, X7R, 10% 1210 Std TDK

1 C25 10 nF Capacitor, Ceramic, 100V, X7R, 10% 0603 Std Std

1 C3 2200 pF Capacitor, Ceramic, 2KV, X7R, 10% 1812 C4532X7R3D222K TDK

2 C4, C7 1 μF Capacitor, Ceramic, 100V, X7R, 10% 1210 Std Std

2 C5, C6 22 μF Capacitor, Aluminum, 100V, ±20% 8×10.2mm EEVFK2A220P Panasonic

1 C8 100 pF Capacitor, Ceramic, 50V, X7R, 10% 0603 C1608X7R1H101K TDK

2 C9, C22 1 nF Capacitor, Ceramic, 100V, X7R, 10% 0805 Std Std

1 CL1 NA Current Loop, 0.025 holes 0.120 ×0.075 inch NA NA

5 D1, D4, D5, D7, D8 BAS16 Diode, Switching, 75V, 200mA SOT23 BAS16LT1 Vishay-Liteon

1 D11 BAV99 Diode, Dual Ultra Fast, Series, 200-mA, 70-V SOT23 BAV99 Fairchild

1 D12 RED Diode, LED, RED, 2.0-V, 850-mcd, SM 1210 LTST-C930KRKT LITE-ON INC

10 D2, D3, D13–D20 B1100 Diode, Schottky, 1A, 100V SMA B1100 Diodes, Inc

1 D21 GREEN Diode, LED, GRN, 2.0-V, 650-mcd,SM 1210 LTST-C930KGKT LITE-ON INC

2 D6, D22 SMAJ58A Diode, TVS, 58-V, 1W SMA SMAJ58A Diodes Inc.

2 D9, D10 12V Diode, Zener, 12-V SOT23 BZX84C12LT1 ON Semiconductor

4 FB1–FB4, 500 Bead, Ferrite, 2000mA, 60m-ohm 1206 MI1206L501R-10 Steward

3 J1, J2, J5 ED1514 Terminal Block, 2-pin, 6-A, 3.5mm 0.27 ×0.25 ED1514 OST

1 J3 7499511001 Connector, RJ45, PoE+ Enabled, 1000 Base-T 0.670 x 1.300 inch 7499511001 Wuerth Electronics

1 J4 5556416-1 Connector, Jack Modular, Vertical, Pos. 0.655 ×0.615 inch 5556416-1 AMP

10 TPS23754EVM-383 EVM: Evaluation Module for TPS23754 SLVU304C–April 2009–Revised November 2011

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Bill of Materials

Table 4. TPS23754EVM-383 Bill of Materials (continued)

Count RefDes Value Description Size Part Number MFR

3 J6–J8 PTC36SAAN Header, Male 3-pin, 100mil spacing, (36-pin strip) 0.100 inch ×3 PTC36SAAN Sullins

2 J9, J10 PTC36SAAN Header, Male 2-pin, 100mil spacing, (36-pin strip) 0.100 inch ×2 PTC36SAAN Sullins

1 L1 3.3 μH Inductor, SMT, 2.15A, 35 milliohm or 1.53A, 32 5.1×5.1mm 744043003 or Wurth or Coilcraft

milliohm MSS5131-332MX

1 L2 22 μH Inductor, SMT, 4.1A, 43 milliohm or 3.8A, 33 0.492 sq"744770122 or Wurth or Pulse

milliohm P1173.223T

1 L3 1 mH Inductor, SMT, 100mA, 16.3 Ohms 0.169 ×0.169 inch LPS4414-105MLC Coilcraft

1 Q1 Si2325DS MOSFET,P-ch, -150 V, 690-mA, 1.2 Ohms SOT-23 Si2325DS Vishay

2 Q2, Q4 MMBTA06 Bipolar, NPN, 80V, 500mA SOT23 MMBTA06LT1 ON Semiconductor

1 Q3 Si4850EY MOSFET, Nch, 60V, 8.5A, 22milliohm SO8 Si4850EY Vishay

1 Q5 Si7852DP MOSFET, Nchan, 80V, 12A, 16-milliohm PWRPAK-S08 Si7852DP Vishay

1 Q6 Si4848DY MOSFET, N-ch, 150V, 3.7A, 85 milliohm SO8 Si4848DY Vishay

1 R1 100K Resistor, Chip, 1/16W, 1% 0603 Std Std

1 R11 80.6K Resistor, Chip, 1/16W, 1% 0603 Std Std

1 R12 63.4K Resistor, Chip, 1/16W, 1% 0603 Std Std

1 R13 63.4 Resistor, Chip, 1/10W, 1% 0805 Std Std

1 R14 10 Resistor, Chip, 1/16W, 1% 0603 Std Std

1 R15 1K Resistor, Chip, 1/16W, 1% 0603 Std Std

1 R16 0.12 Resistor, Chip, 1/4W, 1% 1206 ERJ-8RQFR12V Panasonic ECG

1 R17 348 Resistor, Chip, 1/16W, 1% 0603 Std Std

1 R18 49.9 Resistor, Chip, 1/16W, 1% 0603 Std Std

1 R2 6.49K Resistor, Chip, 1/10-W, 1% 0805 Std Std

1 R20 2.87K Resistor, Chip, 1/10-W, 1% 0805 Std Std

1 R21 1.5K Resistor, Chip, 1/16W, 1% 0603 Std Std

1 R23 41.2K Resistor, Chip, 1/16W, 1% 0603 Std Std

1 R25 11.0K Resistor, Chip, 1/16W, 1% 0603 Std Std

4 R26–R29 75 Resistor, Chip, 1/16W, 1% 0603 Std Std

3 R3, R19, R24 10K Resistor, Chip, 1/16W, 1% 0603 Std Std

1 R4 4.02K Resistor, Chip, 1/16W, 1% 0603 Std Std

1 R22 2.49K Resistor, Chip, 1/16W, 1% 0603 Std Std

1 R5 8.87K Resistor, Chip, 1/16W, 1% 0603 Std Std

1 R6 0 Resistor, Chip, 1/16W, 1% 0603 Std Std

2 R7, R10 2K Resistor, Chip, 1/4W, 5% 1210 Std Std

1 R8 24.9K Resistor, Chip, 1/16W, 1% 0603 Std Std

SLVU304C–April 2009–Revised November 2011 TPS23754EVM-383 EVM: Evaluation Module for TPS23754

Bill of Materials

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Table 4. TPS23754EVM-383 Bill of Materials (continued)

Count RefDes Value Description Size Part Number MFR

1 R9 69.8K Resistor, Chip, 1/16W, 1% 0603 Std Std

1 T1 750311320 or Transformer, forward, 100 μH, 12V, 2.5A 0.524 ×0.685 inch 750311320 or Wurth or

PA2649NL or PA2649NL or Pulse or

835-01064FC 835-01064FC E&E Magnetics

7 TP1, TP2, TP7–TP9, 5012 Test Point, White, Thru Hole 0.125 ×0.125 inch 5012 Keystone

TP15, TP23

6 TP3, TP10, TP12, 5011 Test Point, Black, Thru Hole 0.125 ×0.125 inch 5011 Keystone

TP16–TP18

6 TP4, TP5, TP11, TP13, 5010 Test Point, Red, Thru Hole 0.125 ×0.125 inch 5010 Keystone

TP20, TP22

4 TP6, TP14, TP19, TP21 5013 Test Point, Orange, Thru Hole 0.125 ×0.125 inch 5013 Keystone

1 U1 TPS23754PWP IC, IEEE 802.3at PoE Interface and Isolated PWP20 TPS23754PWP TI

Converter Controller

1 U2 FOD817AS IC, Optocoupler, 6-V, 80-160% CTR SMT-4PDIP FOD817AS Fairchild

1 U3 TL431ACDBVR IC, Shunt Regulator, 2.49-V ref, 36-V, 10-mA, 1% SOT23-5 TL431ACDBVR TI

4 Bumpons 2566 SPC

5—Shunt, Black 100-mil 929950-00 3M

12 TPS23754EVM-383 EVM: Evaluation Module for TPS23754 SLVU304C–April 2009–Revised November 2011

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Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps

DLP®Products www.dlp.com Energy and Lighting www.ti.com/energy

DSP dsp.ti.com Industrial www.ti.com/industrial

Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical

Interface interface.ti.com Security www.ti.com/security

Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense

Power Mgmt power.ti.com Transportation and Automotive www.ti.com/automotive

Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video

RFID www.ti-rfid.com

OMAP Mobile Processors www.ti.com/omap

Wireless Connectivity www.ti.com/wirelessconnectivity

TI E2E Community Home Page e2e.ti.com

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