DEMO MANUAL DC1814A LTC4274A Single LTPoE++ PSE Controller Description Demonstration circuit 1814A features the LTC®4274A, single port power sourcing equipment (PSE) controller, capable of delivering up to 90W of LTPoE++® power to a compatible LTPoE++ powered device (PD). A proprietary detection/classification scheme allows mutual identification between an LTPoE++ PSE and LTPoE++ PD while remaining compatible and interoperable with existing Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4274A feature set is a superset of the popular LTC4274. These PSE controllers utilize low RON external MOSFETs and 0.25Ω sense resistors which are especially important at the LTPoE++ current levels to maintain the lowest possible heat dissipation. The LTC4274A is available in multiple power grades, allowing delivered PD power of 13W, 25.5W, 38.7W, 52.7W, 70W and 90W. The DC1814A has four variations DC1814A-A, DC1814A-B, DC1814A-C, and DC1814A-D which accommodate the LTPoE++ power levels (Table 1). The LTC4274A is configured in the DC1814A as an AUTO pin high, MID pin high, autonomous midspan power injector; input data from an existing network system is sent out, along with power, to a PD. The LTC4274A autonomously detects a PD, turns power on to the port, and disconnects port power without the need for a microcontroller. A single 55V supply is required to power the DC1814A. A simple LDO regulator circuit on the board powers the digital supply of the LTC4274A. A SHDN pushbutton shuts down the port and disables detection. A RESET pushbutton resets the LTC4274A to the AUTO pin high state. Design files for this circuit board are available at http://www.linear.com/demo/DC1814A L, LT, LTC, LTM, LTPoE++, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Table 1. DC1814A Power Levels DEMO BOARD PSE CONTROLLER MAXIMUM DELIVERED PD POWER POWER SUPPLY* DC1814A-A LTC4274A-1 38.7W 72W DC1814A-B LTC4274A-2 52.7W 72W DC1814A-C LTC4274A-3 70W 120W DC1814A-D LTC4274A-4 90W 140W *Recommended DC1814A power supply minimum to avoid drooping in a worst-case scenario with ILIM current at the port. Set the voltage between 54.75V to 57V for LTPoE++ compliance. dc1814afe 1 DEMO MANUAL DC1814A Quick Start Procedure Demonstration circuit 1814A is easy to set up for evaluating the performance of the LTC4274A. Refer to Figure 1 for proper test equipment setup and follow the procedure below. 1.Connect a 55V to 57V power supply across AGND (+) and VEE (–). Size the power supply considering the maximum power delivered to the PD. 2. Connect an 802.3 Type 1 or Type 2, or LTPoE++ compatible PD to RJ45 connector J1 with an Ethernet cable. 3.Measure the port output voltage to the PD across VPORT+ and VPORT– test points. 4.(Optional) Connect a PHY to RJ45 connector J2 with an Ethernet cable for data tests. Figure 1. DC1814A Setup 2 dc1814afe DEMO MANUAL DC1814A Board Layout The power path is from VEE to the sense resistor, to the MOSFET, and out to the port. Select a trace width appropriate for the maximum current. Proper components placement and board layout with respect to the LTC4274A is important to provide electrical robustness and correct operation. The following mentioned components, also shown in Figure 2, must be close to their respective LTC4274A pins with no other components in between on the connection path. Place a 0.1µF capacitor (C1) directly across the LTC4274A VDD and DGND pins. Place a 1µF, 100V capacitor (C4) and a SMAJ58A TVS (D3) directly across the LTC4274A AGND and VEE pins. Place a 0.22µF, 100V capacitor (C5) directly to the OUT pin and an AGND plane. VDD 18 D3 SMAJ58A 19 22 25 26 27 39 C4 0.1µF 100V GATE DGND DGND DGND DGND VEE VEE VEE VEE VEE VEE 10 15 16 17 AGND DGND 30 31 CSRN2512FKR250 32 C5 0.22µF 100V RS1 0.25Ω VEE OUT U1 LTC4274AIUHF C1 0.1µF SENSE 13 VDD Kelvin sensing is necessary to provide accurate current readings. The sense resistor used with the LTC4274A must be 0.25Ω, 1% or better, and with a power rating that can handle the maximum DC current passed through it. A dedicated sense trace from the SENSE pin of the LTC4274A must go directly to the sense resistor solder pad. Avoid connecting to copper cutouts and other traces. The VEE side of the sense resistor must also connect to the VEE pins of the LTC4274A either through a direct trace (Figure 3A), or a VEE copper plane (Figure 3B), without any other components in between on this connection. Q1 FDMC86102 OUT DC1814A F02 Figure 2. LTC4274A Key Application Components for Board Placement Figure 3. LTC4274IUHF VEE and SENSE Kelvin Connection to Sense Resistor dc1814afe 3 DEMO MANUAL DC1814A Supply Voltages The LTC4274A also requires a digital 3.3V supply. The DC1814A uses a simple LDO regulator circuit to power the 3.3V digital supply from the VEE supply. The LTC4274A VDD supply is allowed to be within 5V above or below AGND. On the DC1814A, VDD is tied to AGND and DGND is a negative voltage below AGND. D1, R5, Q2, and R11 generate the negative voltage referenced to AGND (Figure 4). These components are sized to handle the power required to supply the LTC4274A and LEDs on the DC1814A. Contact Linear Technology Applications for 3.3V options. Surge Protection Ethernet ports can be subject to significant cable surge events. To keep PoE voltages below a safe level and protect the application against damage, protection components are required at the main supply, at the LTC4274A supply pins and at the port. Refer to Figure 5. R10 1Ω D23 5.6V DGND Q2 CMPTA92 In a high surge environment, a 10Ω, 0805 resistor in series from supply AGND to the LTC4274A AGND and VDD pin is recommended. The bulk TVS and capacitance remain on the supply side of this 10Ω resistor. The LTC4274A supply pins local TVS and capacitance remain at the LTC4274A side of this 10Ω resistor. The port requires a pair of S1B clamp diodes: one from OUT to supply AGND and one from supply VEE to OUT. The diodes at the ports steer harmful surges into the supply rails where they are absorbed by the surge suppressors and the VEE bypass capacitance. The layout of these paths must be low impedance. 13 VDD U1 LTC4274AIUHF C1 0.1µF 10 15 16 17 DGND DGND DGND DGND AGND D1 3.8V MMSZ4686T1 Bulk transient voltage suppression devices and bulk capacitance are required across the main PoE supply and should be sized to accommodate system level surge requirements. Across the LTC4274A AGND pin and VEE pin are an SMAJ58A, 58V TVS and a 1μF, 100V bypass capacitor. These components must be placed close to the LTC4274A pins. VEE VEE VEE VEE VEE VEE Select a VEE supply with enough power to sustain the port at maximum load. Table 1 shows the maximum delivered PD power as well as a recommended VEE power supply minimum to avoid drooping in a worst case scenario with ILIM current. 18 19 22 25 26 27 39 R5 100k R11 1k 1/4W VEE DC1814A F04 Figure 4. DC1814A LDO Circuit for the LTC4274A Digital Supply 4 dc1814afe DEMO MANUAL DC1814A Supply Voltages 10 15 16 17 DGND DGND DGND DGND R5 100k 18 R11 1k 1/4W D3 SMAJ58A 19 22 25 26 27 39 C4 1µF 100V 30 31 CSRN2512FKR250 32 C5 0.22µF 100V RS1 0.25Ω VEE OUT Q2 CMPTA92 U1 LTC4274AIUHF C1 0.1µF GATE VEE D23 5.6V VDD SENSE D1 3.9V MMSZ4686T1 CBULK 13 VEE VEE VEE VEE VEE VEE TVSBULK R10 1Ω AGND 10Ω 0805 D4 S1B OUT Q1 FDMC86102 D5 S1B VEE DC1814A F05 Figure 5. High Surge Environment Recommended LTC4274A Protection dc1814afe 5 DEMO MANUAL DC1814A PCB Layout 6 Top Silkscreen Layer 1. Top Layer Layer 2. –VIN 1 Layer 3. –VIN 2 Layer 4. Bottom Layer Bottom Silkscreen dc1814afe DEMO MANUAL DC1814A Parts List ITEM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 DC1814A-A 1 2 3 4 DC1814A-B 1 2 3 4 DC1814A-C 1 2 3 4 DC1814A-D 1 2 3 4 QTY 1 1 1 1 2 4 2 1 1 1 1 4 4 2 2 1 4 1 8 1 1 4 2 1 1 1 REFERENCE C1 C2 C5 C4 C3, C6 CT1-CT4 D4, D5 D3 D2 D1 D23 E1-E4 F7-F10 J3, J4 J1, J2 R10 R6-R9 R5 R1-R4, RT1-RT4 R11 RS1 MH1-MH4 SW1, SW2 Q1 Q2 T1 PART DESCRIPTION CAP, 0603 0.1µF 10% 25V X7R CAP, 4.7µF 20% 63V ALUM. CAP, 1206 0.22µF 20% 100V X7R CAP, 1210 1.0µF 10% 100V X7R CAP, 1808 1000pF 10% 2KV X7R CAP, 0805 0.01µF 5% 100V X7R DIODE, RECTIFIER, 100V 1A, SMA DIODE, TVS 58V 400W SMA DIODE, TVS, 64V 600W SMB DIODE, ZENER 3.9V SOD-123 DIODE, ZENER 5.6V 5% SOT23 TESTPOINT, TURRET, 0.094" PBF FUSE, 3A, 63VDC 1206 CONN, JACK, BANANA CONN, RJ45, SINGLE PORT RES, 0603 1.0Ω 5% 1/10W RES, 0603 10k 5% 1/10W RES, 0603 100k 5% 1/10W RES, 0603 75Ω 5% 1/10W RES, THICK FILM 0805 1.0k 5% 1/4W RES, 2512 0.25Ω 1% 2W STAND-OFF, NYLON 0.75" SWITCH, MOMENTARY PUSHBUTTON XSTR, MOSFET, N-CHANNEL 100V 2.3A POWER-33 XSTR, PNP, 300V 500MA SOT23 CMPTA92 XFMR, POE+ 1.5A (Option) MANUFACTURER/PART NUMBER TDK C1608X7R1E104K (BAL. FR#1807) PANASONIC, EEEFK1J4R7R AVX 12061C224MAT AVX, 12101C105KAT TDK C4520X7R3D102K AVX 08051C103JAT VISHAY S1B DIODES INC., SMAJ58A-13-F DIODES INC., SMBJ64A-13-F ON SEMI MMSZ4686T1G FAIRCHILD, BZX84C5V6 MILL-MAX, 2501-2-00-80-00-00-07-0 BEL FUSE C1Q 3 KEYSTONE 575-4 STEWART CONN., SS-7188S-A-NF VISHAY CRCW06031R00JNEA YAGEO, RC0603JR-0710KL YAGEO, RC0603JR-07100KL YAGEO, RC0603JR-0775RL PANASONIC, ERJ-P06J102V STACKPOLE, CSRN2512FKR250 KEYSTONE, 8834(SNAP ON) WÜRTH, 434 123 050 816 FAIRCHILD FDMC86102 CENTRAL SEMI CMPTA92 WÜRTH ELECTRONICS, 749022016 COILCRAFT ETH1-460L 1 4 1 1 DC1814A FB1-FB4 U1 GENERAL BOM FERRITE BEAD, 1k, 0805 IC, LTC4274A-1, SINGLE PORT 38.7W PSE CONTROLLER FAB, PRINTED CIRCUIT BOARD TDK MPZ2012S102A LINEAR LTC4274AIUHF-1 DEMO CIRCUIT 1814A 1 4 1 1 DC1814A FB1-FB4 U1 GENERAL BOM FERRITE BEAD, 1k, 0805 IC, LTC4274A-2, SINGLE PORT 52.7W PSE CONTROLLER FAB, PRINTED CIRCUIT BOARD TDK MPZ2012S102A LINEAR LTC4274AIUHF-2 DEMO CIRCUIT 1814A 1 4 1 1 DC1814A FB1-FB4 U1 GENERAL BOM FERRITE BEAD, 1k, 0805 IC, LTC4274A-3, SINGLE PORT 70W PSE CONTROLLER FAB, PRINTED CIRCUIT BOARD TDK MPZ2012S102A LINEAR LTC4274AIUHF-3 DEMO CIRCUIT 1814A 1 4 1 1 DC1814A FB1-FB4 U1 GENERAL BOM FERRITE BEAD, 1300Ω, 1812 IC, LTC4274A-4, SINGLE PORT 90W PSE CONTROLLER FAB, PRINTED CIRCUIT BOARD TAIYO YUDEN FBMH4532HM132-T LINEAR LTC4274AIUHF-4 DEMO CIRCUIT 1814A dc1814afe 7 A B C D J3 VEE (-) J4 (55V TO 57V) MAIN PS INPUTS (+) AGND E2 E1 5 4.7uF 63V C2 SMBJ64A D2 + VEE D1 3.9V MMSZ4686T1 1 1 100K R5 D23 5.6V 2 2 R11 1.0K 1/4W 10 15 16 17 C1 0.1uF 36 33 13 4 DGND DGND DGND DGND MID AUTO VDD R7 10K TP2 VDD D3 SMAJ58A Q2 CMPTA92 TP1 DGND R10 1 SHDN SW1 RESET SW2 FOR HIGH SURGE ENVIRONMENTS ADD A 10 OHM, 0805 RESISTOR AT THIS LOCATION 2. INSTALL SHUNTS AS SHOWN. 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 4 R8 SCL 10K R6 10K RS1 0.25 CSRN2512FKR250 C4 1.0uF 100V SDA 10K R9 9 10 7 NOTE: UNLESS OTHERWISE SPECIFIED 3 1 14 18 MSD 35 RESET 34 SHDN AGND 38 SCL 3 SDAIN 37 INT VEE VEE VEE VEE VEE VEE 19 22 25 26 27 39 1 SDAOUT 1 2 3 4 5 6 7 8 DNC FDMC86102 Q1 NC NC NC NC NC NC NC NC NC NC R3 75 20 5 13 T1: WURTH 749022016 COILCRAFT ETH1-460L 15 14 12 16 9 11 10 18 17 8 7 19 6 21 22 4 24 23 3 T1 1 2 FB1 SEE TABLE 3 C5 0.22uF 100V VEE D5 S1B D4 S1B VPORT - VPORT + 90W -D 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. JK DILIAN R. PCB DES. APP ENG. SCALE = NONE C6 1000pF 2kV CT4 0.01uF 0805 100V CT3 0.01uF 0805 100V CT2 0.01uF 0805 100V U1 DATE: N/A SIZE 10 9 FB1, FB2, FB3, FB4 SS-7188S-A-NF J1 DATE 9/26/11 3/28/13 12/8/15 4/29/11 TM Tuesday, December 08, 2015 1 DEMO CIRCUIT 1814A LTC4274AIUHF FAMILY SHEET 1 PSE CONTROLLER 1 OF 1 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only FBMH4532HM132-T MPZ2012S102A MPZ2012S102A MPZ2012S102A SINGLE PORT LTPoE++ IC NO. APPROVED DATA AND POWER OUT 1 2 3 4 5 6 7 8 TECHNOLOGY LTC4274AIUHF-4 LTC4274AIUHF-3 LTC4274AIUHF-2 TITLE: SCHEMATIC 1 DESCRIPTION REVISION HISTORY PRODUCTION DILIAN R. POWER LEVEL UPDATE DILIAN R. T1 OPTION DILIAN R. DILIAN R. SURGE RESISTOR LTC4274AIUHF-1 F10 C1Q 3 3A, 1206 1 1a 1b 1c REV CT1 0.01uF 0805 100V _ _ _ ECO SEE TABLE FB4 RT4 75 RT3 75 RT2 75 RT1 75 APPROVALS 70W CUSTOMER NOTICE 52.7W -C 38.7W -WATT PSE -B -A FB3 F9 C1Q 3 3A, 1206 F7 C1Q 3 3A, 1206 FB2 2 ASSEMBLY VERSION E4 E3 NOTE: FOR TEMPERATURE SENSITIVE 90W APPLICATIONS, TWO OF THE 749012013 MAY BE F8 USED AS AN ALTERNATE TO T1 WHICH HAS A C1Q 3 HIGHER CURRENT RATING 3A, 1206 C3 1000pF 2kV R4 75 R2 75 R1 75 3 U1 LTC4274AIUHF 8 2 9 11 12 20 21 23 24 28 29 SS-7188S-A-NF J2 DATA IN 5 AD1 6 AD0 SENSE 30 AD3 4 AD2 GATE 31 OUT 8 32 5 A B C D DEMO MANUAL DC1814A Schematic Diagram dc1814afe DEMO MANUAL DC1814A Assembly Drawing Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. dc1814afe 9 DEMO MANUAL DC1814A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation 10 Linear Technology Corporation dc1814afe LT 0116 REV E • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2011