LT4295 LINER

Document overview

  • Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 12

Technical content

Description

LT4295, LT4321 High Efficiency IEEE802.3bt (PoE++, Type 3, 40W) PD with PoE Ideal Diode Bridge Demonstration circuit 2475A-A is an IEEE802.3bt (Draft 2.0) compliant Power over Ethernet (PoE) powered device (PD). It features the LT®4295 PD interface and switching regulator controller with the LT4321 PoE ideal diode bridge controller . The LT4295 provides IEEE802. 3af (PoE, Type 1), IEEE802.3at (PoE +, Type 2), and IEEE802.3bt (PoE ++, Type 3 and 4) compliant interfacing and power supply control. It utilizes an external, low R DS(ON) (57mΩ typi- cal) N-channel FET for the Hot Swap function to improve efficiency. The LT4295 controls a DC/DC converter that utilizes a highly efficient flyback topology with synchro - nous rectification. The LT4321 controls eight low R DS(ON) (57mΩ typical) N-channel FETs to further improve end-to-end power L, L T , L TC, L TM, Linear Technology, the Linear logo and L TPoE++ are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. performance summary BoarD photo delivery efficiency and ease thermal design. This solution replaces the eight diodes typically found in a passive PoE rectifier bridge. The DC2475A-A accepts up to 40W of delivered power from a power sourcing equipment (PSE) via the RJ45 connector (J1) or a local 48VDC power supply using the auxiliary supply input. When both supplies are connected, the auxiliary supply input has priority over the PoE input. The DC2475A-A supplies a 12V output at up to 3A. Design files for this circuit board are available at http://www.linear .com/demo/DC2475A-A Top Side PARAMETER CONDITIONS VALUE Port Voltage (VPORT) At RJ45 37V to 57V Auxiliary Voltage From AUX+ to AUX– Terminals 37V to 57V Output Voltage (VOUT) 12V (Typical) Output Current (IOUT) 3A (Max) Output Voltage Ripple VPORT = 44V, IOUT = 3A 85mVP-P (Typical) Load Regulation ±0.1% (Typical) Efficiency VPORT = 50V, IOUT = 3A, End-to-End 92% (Typical) Switching Frequency 250kHz (Typical) Bottom Side

  1. Place and connect test equipment (voltmeter , ammeter

oscilloscope, and electronic load) as shown in Figure 9.

  1. Turn down the electronic load to a minimum value and

turn off the electronic load.

  1. Once the LED (D4 ) on the DC2475A is lit, check the

efficiency, and other parameters. operation is provided in Table 2. Table 2. T2P Response During Auxiliary Power Operation

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC2475A General BOM 1 1 CG1 CAP , CER, X7R 1000pF 2kV 10% 1808 MURATA GR442QR73D102KW01L 2 1 CG2 CAP , CER, X7R 0.01µF 100V 20% 1206 AVX 12061C103MAT2A 3 0 C1 CAP , CER, OPT 2kV 1812 OPT 4 0 C5 CAP , CER, X7U OPT 6.3V 10% 1210 OPT 5 1 C6 CAP , ELEC, 10µF 100V 10% 6.3x7.7 SUNCON 100CE10BS 6 1 C7 CAP , CER, X7R 2.2µF 100V 10% 1210 MURATA GRM32ER72A225KA35 7 1 C10 CAP , CER, X7R 10nF 100V 20% 0603 MURATA GRM188R72A103KA01D 8 1 C11 CAP , CER, X7R 0.047µF 100V 20% 0603 KEMET C0603C473M1RACTU 9 1 C12 CAP , CER, X7R 0.047µF 100V 10% 0805 MURATA GRM21BR72A473KA01L 10 1 C13 CAP , CER, X7R 10µF 10V 10% 1206 MURATA GRM31CR71A106KA01L 11 0 C15, C18, C19, C21 CAP , CER, X5R OPT 2kV 20% 1812 OPT 12 1 C17 CAP , CER, X7R 1µF 25V 10% 0603 MURATA GRM188R71E105KA12 13 1 C20 CAP , CER, X7R 2.2nF 25V 10% 0603 MURATA GRM188R71E222KA01 14 1 C23 CAP , CER, X7R 4.7nF 2kV 1812 MURATA GR443DR73D472KW01L 15 1 C26 CAP , CER, X7R 100pF 16V 0402 AVX, 0402YC101KAT2A 16 0 C27 CAP , CER, X7R OPT 6.3V 10% 0402 OPT 17 1 D1 DIODE, SCHOTTKY, B2100 100V SMB DIODES INC B2100-13-F 18 1 D2 DIODE, TVS, PTVS58VS1UR 58V SOD123 NXP PTVS58VS1UR 19 1 D3 DIODE, ZENER, MMSZ5252BS 24V SOD323 DIODES INC MMSZ5252BS 20 1 D4 DIODE, LED GREEN ROHM SML-010FTT86L 21 1 D13 DIODE, SCHOTTKY, NXP , BAT46W 100V SOD323 NXP BAT46WJ,115 22 1 D15 DIODE, DIODE INC, BAV19WS 120V SOD323 DIODE INC BAV19WS 23 1 D16 DIODE, TVS, PTVS58VS1UR 58V SOD123 NXP PTVS58VS1UR 24 1 D17 DIODE, SCHOTTKY, PMEG1020EA 10V SOD323 NXP PMEG1020EA 25 1 D19 DIODE, TVS, PTVS58VS1UR 58V SOD123 NXP PTVS58VS1UR 26 7 E1, E2, E3, E4, E9, E10, E12 TP , TURRET , PAD150-094 0.094" MILL-MAX 2501-2-00-80-00-00-07-0 27 1 J1 CONN, INTEGRATED JACK, 7499511001 WURTH 7499511001A 28 1 J2 CONN, RJ45 JACK, SS-6488-NF-K1 STEWART CONNECTOR SS-6488-NF-K1 AL TERNATE SS-6488S-A-NF 29 1 L2 IND, 10µH COILCRAFT DO1608C-103 30 1 L4 IND, 100µH COILCRAFT DO1608C-104

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 31 9 Q1, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18 MOSFET , N-CH, PSMN075-100MSE 100V LFPAK33 NXP PSMN075-100MSE 32 1 Q5 TRANSISTOR, PNP , MMBT3906 40V SOT23 FAIRCHILD MMBT3906 33 1 Q6 TRANSISTOR, NPN, MMBT3904 40V SOT23 FAIRCHILD MMBT3904 34 1 Q7 TRAN, PNP , FMMT723 100V SOT23 DIODES INC FMMT723TA 35 0 Q7 (AL TERNATE) TRAN, PNP , PBSS9110T 100V SOT23 NXP PBSS9110T 36 4 RT1, RT2, RT3, RT4 RES, CHIP , 75Ω 5% 0603 NIC NRC06J750TRF 37 1 R5 RES, CHIP , 8.2Ω 5% 0805 NIC NRC10J8R2TRF 38 1 R6 RES, CHIP , 3.3k 5% 0603 NIC NRC06J332TRF 39 1 R7 RES, CHIP , 20Ω 5% 0805 VISHAY CRCW080520R0JNEA 40 1 R12 RES, CHIP , 0Ω 5% 0603 NIC NRC06ZOTRF 41 1 R13 RES, CHIP , 100Ω 5% 0603 VISHAY CRCW0603100RFKEA 42 1 R15 RES, CHIP , 15Ω 5% 0603 NIC NRC06J150TRF 43 1 R17 RES, CHIP , 2.00k 1% 0603 NIC NRC06F2001TRF 44 1 R18 RES, CHIP , 10k 5% 0603 YAGEO RC0603JR-0710KL 45 1 R21 RES, CHIP , 174k 1% 0603 VISHAY CRCW0603174KFKEA 46 1 R22 RES, CHIP , 107k 1% 0603 NIC NRC06F1073TRF 47 1 R27 RES, CHIP , 0Ω 5% 0402 NIC NRC04ZOTRF 48 1 R28 RES, CHIP , 0Ω 5% 0603 NIC NRC06ZOTRF 49 1 R29 RES, CHIP , 52.3k 1% 0603 VISHAY CRCW060352K3FKEA 50 0 R32 RES, CHIP , OPT 5% 1812 OPT 51 1 T3 XFMR, SMD GATE DRIVE, PE-68386NL PULSE PE-68386NL 52 0 T3 (AL TERNATE) XFMR, SMD GATE DRIVE, EPA4271GE PCA EPA4271GE 53 1 U3 IC, PoE IDEAL BRIDGE CONTROLLER, LT4321IUF QFN16 LINEAR TECH LT4321IUF#PBF 54 2 STENCIL (TOP AND BOTTOM) STENCIL DC2475A DC2475A-A

1 DC2475A – GENERAL BOM

1 1 C2 CAP , CER, X5R 10µF 16V 10% 1206 MURATA GRM31CR61C106KA88 2 1 C3 CAP , CER, X5R 10µF 16V 10% 1206 MURATA GRM31CR61C106KA88 3 1 C4 CAP , ELEC, 33µF 25V 20% 5.0X5.8 PANASONIC EEHZA1E330R 4 1 C8 CAP , CER, U2J 470pF 630V 5% 1206 MURATA GRM31A7U2J471JW31D 5 1 C9 CAP , CER, U2J 100pF 630V 5% 1206 MURATA GRM31A7U2J101JW31D 6 1 C16 CAP , CER, X7R 1µF 25V 10% 0805 MURATA GRM21BR71E105KA99L 7 1 C22 CAP , CER, X7R 3.3nF 25V 10% 0603 AVX 06033C332KAT2A 8 1 C24 CAP , CER, X7R 0.1µF 25V 20% 0603 MURATA GRM188R71E104KA01D 9 1 C25 CAP , CER, X7R 220pF 25V 10% 0603 AVX 06033C221KAT4A 10 0 D18 DIODE, DIODE INC, OPT 40V SOD323 DIODE INC OPT 11 1 E11 TP , TURRET , PAD150-094 0.094" MILL-MAX 2501-2-00-80-00-00-07-0 12 1 L1 IND, 180nH COILCRAFT DO1813P-181HC 13 1 L3 IND, CMC, 1mH WURTH 744 272 102 parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 14 1 Q2 MOSFET , N-CH, 100V TSON TOSHIBA TPN1600ANH 15 0 Q3 MOSFET , N-CH, OPT SOT23 OPT 16 1 Q4 MOSFET , N-CH, 200V TDSON-8 INFINEON BSZ900N20NS3 17 1 R2 RES, CHIP , 1.5k 5% 0805 NIC NRC10J152TRF 18 1 R3 RES, CHIP , 200Ω 5% 1206 NIC NRC12F2000TRF 19 1 R4 RES, CHIP , 200Ω 5% 1206 NIC NRC12F2000TRF 20 1 R8 RES, CHIP , 27Ω 5% 1206 VISHAY CRCW120627R0JNEA 21 1 R9 RES, CHIP , 27Ω 5% 1206 VISHAY CRCW120627R0JNEA 22 1 R10 RES, CHIP , 6.65k 1% 0603 NIC NRC06F6651TRF 23 1 R11 RES, CHIP , 7.50k 1% 0603 VISHAY CRCW06037K50FKEA 24 1 R14 RES, CHIP , 25mΩ 1% 1206 VISHAY WSL1206R0250FEA 25 1 R16 RES, CHIP , 0Ω, SHUNT , 0805 VISHAY CRCW08050000Z0EA 26 1 R19 RES, CHIP , 37.4Ω 1% 0805 VISHAY CRCW080537R4FKEA 27 1 R20 RES, CHIP , 1.00Ω 1% 0805 VISHAY CRCW08051K00FKEA 28 0 R23 RES, CHIP , OPT 5% 0603 OPT 29 1 R24 RES, CHIP , 26.1k 5% 0603 VISHAY CRCW060326K1FKEA 30 1 R25 RES, CHIP , 10k 5% 0603 YAGEO RC0603JR-0710KL 31 1 R26 RES, CHIP , 5.1k 5% 0603 YAGEO RC0603JR-075K1L 32 0 R30 RES, CHIP , OPT 5% 0805 OPT 33 0 R31 RES, CHIP , SHUNT , 2512 OPT 34 1 T1 XFMR, FL YBACK TRAN, 750316115 WURTH 750316115 35 0 T1 (AL TERNATE) XFMR, FL YBACK TRAN, EPC3634G PCA EPC3634G 36 0 T2 XFMR, FL YBACK TRAN, OPT OPT 37 1 U1 IC, PD AND SWITCHER CONTROLLER, LT4295IUFD QFN28 LINEAR TECH LT4295IUFD 38 1 U2 IC, TRANSISTOR OUTPUT OPTOCOUPLER, SO-8 FAIRCHILD SEMI, MOC207M 39 4 MH1-MH4 STAND-OFF , NYLON 0.50" TALL (SNAP ON) KEYSTONE 8833 40 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2475A parts List

-VOUT +VOUT VPORTN ___ GND AUX+ AUX- 12V/3A OPTIONAL COMPONENTS 37V-57V 37V-57V +VOUT +VOUT VPORTP +VOUT VCC VCC VPORTP VPORTN

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV KAUNG H.PRODUCTION1 2 3-3-2016 DESCRIPTION DATEAPPROVEDECO REV KAUNG H.PRODUCTION1 2 3-3-2016 DESCRIPTION DATEAPPROVEDECO REV KAUNG H.PRODUCTION1 2 3-3-2016 SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, June 02, 2016 12 HIGH EFFICIENCY IEEE802.3bt PD WITH PoE IDEAL DIODE BRIDGE K. HTOO K. HTOO N/A LT4295IUFD, LT4321IUF DEMO CIRCUIT 2475A-A SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, June 02, 2016 12 HIGH EFFICIENCY IEEE802.3bt PD WITH PoE IDEAL DIODE BRIDGE K. HTOO K. HTOO N/A LT4295IUFD, LT4321IUF DEMO CIRCUIT 2475A-A SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, June 02, 2016 12 HIGH EFFICIENCY IEEE802.3bt PD WITH PoE IDEAL DIODE BRIDGE K. HTOO K. HTOO N/A LT4295IUFD, LT4321IUF DEMO CIRCUIT 2475A-A D19 PTVS58VS1UR HSS R31 OPT 2512 E12 1uF C16 0805 25V R13 100 470pF 1206 R16 0805 1206 OPT 750316115 2.2uF 100V 1210 X7R OPT R19 37.4 0805 1.5K R32 OPT OPT C27 0402 1uF C17 B2100 2 1 0.047uF C12 100V exposed pad, solder side LT4295IUFD VPORT28 HSGATE26 HSSRC25 SWVCC23 DNC 22 VCC21 VIN24 PG20 FB3114 ISEN- 16 ISEN+ 17 SG18 AUX2 RCLASS++3 RCLASS4 GND 19 VCC6 VCC7 VCC8 T2P5 SFST11 RLDCMP15 VCC9 GND1 ITHB 13 FFSDLY12 NC 27 ROSC10 GND_EP29 R11 7.50K PE-68386NL D16 PTVS58VS1UR 100pF C26 25V 0402 100uH DO1608C-104 MOC207 1 7 D13 BAT46WJ,1151 2 R29 52.3K 220pF C25 10uH Coilcraft DO1608C-103 1mH 744272102 1 2 OPT R12 10uF 100V 6.3x7.7 R14 25m 1206 E10 8.2

0805 C10

2.00K R22 107K MMBT3906 OPT C15 0805 180nH COILCRAFT DO1813P-181HC 200 1206 TPN1600ANH 4.7nF C23 2KV R15 OPT C21 OPT PSMN075-100MSE 0.1uF C24 R25 10K 200 1206 D18 OPT 2 1 R30 OPT 0805 R24 26.1K E11 FMMT723A R20 1.00K 0805 R18 10K +C4 33uF 25V EEHZA1E330R D15 BAV19WS OPT C19 10uF X5R 16V 1206 R27 0402 1206 3.3nF C22 R26 5.1K 2.2nF C20 X5R 16V 1206 10uF LED R21 174K BSZ900N20NS3 100pF 1206 MMBT3904 Q6 1 2 3 D17 PMEG1020EA OPT C18 10uF C13 10V 1206 3.3K R10 6.65K R23 OPT VSEC_P VPRI_SG VAUX_P SG VPRI_SW PG VPRI_P VAUX_P VSEC_SW VSEC_SW VSEC_P VPRI_SW VSEC_P VPRI_P PG VPRI_SG VSEC_SG VSEC_SG VAUX_P VSEC_P

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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. schematic Diagram D D C C B B A A OUT TO PHY IN FROM PoE+ PSE PoE IDEAL DIODE BRIDGE VPORTN VPORTP DESCRIPTION DATEAPPROVEDECO REV KAUNG H.PRODUCTION1 2 3-3-2016 DESCRIPTION DATEAPPROVEDECO REV KAUNG H.PRODUCTION1 2 3-3-2016 DESCRIPTION DATEAPPROVEDECO REV KAUNG H.PRODUCTION1 2 3-3-2016 SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, June 02, 2016 22 HIGH EFFICIENCY IEEE802.3bt PD WITH PoE IDEAL DIODE BRIDGE K. HTOO K. HTOO N/A LT4295IUFD, LT4321IUF DEMO CIRCUIT 2475A-A SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, June 02, 2016 22 HIGH EFFICIENCY IEEE802.3bt PD WITH PoE IDEAL DIODE BRIDGE K. HTOO K. HTOO N/A LT4295IUFD, LT4321IUF DEMO CIRCUIT 2475A-A SIZE DATE: IC NO. REV. SHEET OF TITLE: APPROVALS PCB DES. APP ENG. TECHNOLOGY Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only CUSTOMER NOTICE 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE www.linear.com Thursday, June 02, 2016 22 HIGH EFFICIENCY IEEE802.3bt PD WITH PoE IDEAL DIODE BRIDGE K. HTOO K. HTOO N/A LT4295IUFD, LT4321IUF DEMO CIRCUIT 2475A-A RT4 Q16 PSMN075-100MSE SS-6488S-A-NF 9 10 Q18 PSMN075-100MSE R28 Q15 PSMN075-100MSE Q17 PSMN075-100MSE C11 0.047uF 100V DATA2-1 CG1 1000pF 1808 2KV RT3 Q14 PSMN075-100MSE DATA1-1 MMSZ5252BS 24V 21Q13 PSMN075-100MSE Q12 PSMN075-100MSE Q11 PSMN075-100MSE CG2 0.01uF 100V 1206 EP LT4321IUF TG361 IN362 IN453 TG454 TG785 IN786 BG787 BG458 OUTP 12 EN 11 EN 10 OUTN 9 TG1216 IN1215 BG1214 BG3613 17OUTN DATA2-2 RT1 RT2

4 X 12nF

4 X 75 Ohms

© LINEAR TECHNOLOGY CORPORATION 2016 LT 0517 REV B • PRINTED IN USA 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