DEMO MANUAL DC2539A-A LT4295, LT4321 High Efficiency IEEE802.3bt (PoE++, Type 3, 51W) PD with Flyback DC/DC Converter and Auxiliary Power Input Description Demonstration circuit 2539A is an IEEE802.3bt (Draft 2.1) compliant Power over Ethernet (PoE) Powered Device (PD). It features the LT(R)4295 PD interface and switching regulator controller and 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) compliant interfacing and power supply control. It utilizes an external, low RDS(ON) (57m typical) 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 synchronous rectification. The LT4321 controls eight low RDS(ON) (30m typical) N-channel FETs to further improve end-to-end power Performance Summary delivery efficiency and ease thermal design. This solution replaces the eight diodes typically found in a passive PoE rectifier bridge. The DC2539A-A accepts up to 51W 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 DC2539A-A supplies a 12V output at up to 3.9A. Design files for this circuit board are available at http://www.linear.com/demo/DC2539A-A L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Specifications are at TA = 25C 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) 3.9A (Max) Output Voltage Ripple VPORT = 42.5V, IOUT = 3.9A 54mVP-P (Typical) VPORT = 50V, IOUT = 3A, End-to-End 91.5% (Typical) Load Regulation 0.4% (Typical) Efficiency Switching Frequency 250kHz (Typical) Board Photos Top Side Bottom Side dc2539aafb 1 DEMO MANUAL DC2539A-A Typical Performance Characteristics Top Side Bottom Side Figure 1. Thermal Pictures (Conditions: VPORT = 57V, VOUT = 12V, IOUT = 3.9A) Figure 2. Efficiency (End-to-End) 2 dc2539aafb DEMO MANUAL DC2539A-A Typical Performance Characteristics Figure 3. Load Regulation dc2539aafb 3 DEMO MANUAL DC2539A-A Typical Performance Characteristics Figure 4. Switch Node Waveforms (Conditions: VPORT = 57V, VOUT = 12V, IOUT = 3.9A) Figure 5. Output Voltage Ripple (Conditions: VPORT = 42.5V, VOUT = 12V, IOUT = 3.9A) 4 dc2539aafb DEMO MANUAL DC2539A-A Typical Performance Characteristics Figure 6. Load Transient Response (Conditions: VPORT = 42.5V, Load Step: 2A to 4A to 2A) dc2539aafb 5 DEMO MANUAL DC2539A-A Typical Performance Characteristics Figure 7. Gain and Phase Margin of the Flyback DC/DC Converter (Conditions: VPORT = 57V, VOUT = 12V, IOUT = 3.9A) 6 CROSSOVER FREQUENCY GAIN MARGIN PHASE MARGIN 5.8kHz 20dB 63 dc2539aafb DEMO MANUAL DC2539A-A Quick Start Procedure Power Over Ethernet (PoE) Input 1 Disconnect auxiliary supply if it is connected to AUX+ and AUX- inputs of the DC2539A-A. 2 Place and connect test equipment (voltmeter, ammeter, oscilloscope, and electronic load) as shown in Figure 8. 3 Turn down the electronic load to a minimum value and turn off the electronic load. 4 Connect the output of the IEEE 802.3bt compliant PSE to the RJ45 connector (J1) of the DC2539A using a CAT5e or CAT6 Ethernet cable. (See note.) 5 After the LED (D4) on the DC2539A is lit, check the output voltage using a voltmeter. Output voltage should be within 12.0V0.2V. + DC POWER SUPPLY - + IEEE802.3bt PSE 6 Turn on the electronic load and increase its load current up to 3.9A. Observe the output voltage regulation, efficiency, and other parameters. 7 Verify T2P response with an oscilloscope as shown in Figure 8. The T2P response to the type of PSE connected to the DC2539A-A is provided in Table 1. Note: An 802.3bt PSE has not yet been released. In the interim, an LTPoE++(R) compliant PSE (DC1814A-B) may be used to provide power to the DC2539A-A. The LTPoE++ classification will not be 802.3bt compliant, but the PSE will provide a compatible detection and power output. Specifically, the T2P output of the DC2539A-A is different from the behavior stated in Table 1 and will indicate connection to a Type 2 PSE. Otherwise PD behavior will be unaffected. CAT5e OR CAT6 CABLE - + + ELECTRONIC LOAD VOLT METER - - + AM METER - - OSCILLOSCOPE + DC2539 F08 Figure 8. Setup Diagram for PoE Input Table 1. T2P Response PSE IEEE LTPoE++, 52.7W T2P Response Negotiated PD Input Power Logic High 13W Logic Low 25.5W 50% Logic High/50% Logic Low, Toggle at 976Hz 7% 51W Logic Low 51W dc2539aafb 7 DEMO MANUAL DC2539A-A Quick Start Procedure Auxiliary Supply Input 1. Place and connect test equipment (voltmeter, ammeter, oscilloscope, and electronic load) as shown in Figure 9. 2. Turn down the electronic load to a minimum value and turn off the electronic load. 3. Connect the output of the auxiliary supply to the DC2539A as shown in Figure 9. Turn on the auxiliary supply and set its current limit to 2A. Then increase its output voltage to 48V. 4. Once the LED (D4) on the DC2539A is lit, check the output voltage using a voltmeter. Output voltage should be within 12.0V0.2V. 5. Turn on the electronic load and increase its load current up to 3.9A. Observe the output voltage regulation, efficiency, and other parameters. 6. Verify T2P response with an oscilloscope as shown in Figure 9. The T2P response during auxiliary power operation is: 75% Logic High/25% Logic Low, Toggle at 976Hz 7% + + ELECTRONIC LOAD VOLT METER - - + AM METER - - OSCILLOSCOPE + DC2539 F09 + - AUXILIARY SUPPLY Figure 9. Setup Diagram for Auxiliary Supply Input 8 dc2539aafb DEMO MANUAL DC2539A-A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC2539A General BOM 1 1 CG1 CAP, CER, X7R 1000pF 2kV 10% 1808 MURATA GR442QR73D102KW01L 2 1 CG2 CAP, CER, X7R 0.01F 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, 10F 100V 20% 6.3 x 7.7 SUNCON 100CE10KX 6 1 C7, C29 CAP, CER, X7R 2.2F 100V 10% 1210 MURATA GRM32ER72A225KA35 7 1 C10 CAP, CER, X7R 10nF 100V 20% 0603 MURATA GRM188R72A103KA01D 8 2 C11, C12 CAP, CER, X7R 0.047F 100V 10% 0603 KEMET C0603C473K1RACTU 9 1 C13 CAP, CER, X7R 10F 10V 10% 1206 MURATA GRM31CR71A106KA01L 10 0 C15, C18, C19, C21 CAP, CER, X5R OPT 2kV 20% 1812 OPT 11 1 C17 CAP, CER, X7R 1F 25V 10% 0603 MURATA GRM188R71E105KA12 12 1 C20 CAP, CER, X7R 2.2nF 25V 10% 0603 MURATA GRM188R71E222KA01 13 1 C23 CAP, CER, X7R 4.7nF 2kV 1812 MURATA GR443DR73D472KW01L 14 1 C26 CAP, CER, X7R 100pF 16V 0402 AVX, 0402YC101KAT2A 15 0 C27 CAP, CER, X7R OPT 6.3V 10% 0402 OPT 16 1 D1 DIODE, SCHOTTKY, PMEG10020 100V SOD128 NXP PMEG10020AELPX 17 3 D2, D16, D19 DIODE, TVS, PTVS58VS1UR 58V SOD123 NXP PTVS58VS1UR 18 1 D3 DIODE, ZENER, MMSZ5252BS 24V SOD323 DIODES INC MMSZ5252BS 19 1 D4 DIODE, LED GREEN ROHM SML-010FTT86L 20 1 D13 DIODE, SCHOTTKY, NXP, BAT46W 100V SOD323 NXP BAT46WJ,115 21 1 D15 DIODE, DIODE INC, BAV19WS 120V SOD323 DIODE INC BAV19WS 22 1 D17 DIODE, SCHOTTKY, PMEG1020EA 10V SOD323 NXP PMEG1020EA 23 8 E2, E3, E4, E5, E6, E9, E11, E12 TP, TURRET, PAD150-094 0.094" MILL-MAX 2501-2-00-80-00-00-07-0 24 1 J1 CONN, INTEGRATED JACK, 7499511001A WURTH 7499511001A 25 1 J2 CONN, RJ45 JACK, SS-6488-NF-K1 STEWART CONNECTOR SS-6488-NF-K1 26 2 J3, J4 CONN, BANANA, 575-4 0.175" KEYSTONE 575-4 27 1 L2 IND, 4.7H WURTH 744316470 28 1 L4 IND, 100H COILCRAFT DO1608C-104 29 0 L5 IND, OPT OPT 30 9 Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18 MOSFET, N-CH, PSMN075-100MSE 100 LFPAK33 NXP PSMN075-100MSE 31 1 Q1 MOSFET, N-CH, PSMN040-100MSE 100 LFPAK33 NXP PSMN040-100MSE 32 1 Q5 TRANSISTOR, PNP, PBSS5140T 40V SOT23 NXP PBSS5140T 33 1 Q6 TRANSISTOR, NPN, PBSS4140T 40V SOT23 NXP PBSS4140T 34 1 Q7 TRANSISTOR, PNP, FMMT723 100V SOT23 DIODES INC FMMT723TA 35 4 RT1, RT2, RT3, RT4 RES, CHIP, 75 5% 0603 NIC NRC06J750TRF 36 1 R5 RES, CHIP, 8.2 5% 0805 NIC NRC10J8R2TRF 37 1 R6 RES, CHIP, 3.3k 5% 0603 NIC NRC06J332TRF 38 1 R7 RES, CHIP, 20 5% 0805 VISHAY CRCW080520R0JNEA 39 1 R12 RES, CHIP, 0 5% 0603 NIC NRC06ZOTRF dc2539aafb 9 DEMO MANUAL DC2539A-A Parts List ITEM QTY 40 1 REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R13 RES, CHIP, 100 5% 0603 VISHAY CRCW0603100RFKEA 41 1 R15 RES, CHIP, 15 5% 0603 NIC NRC06J150TRF 42 1 R17 RES, CHIP, 2.00k 1% 0603 NIC NRC06F2001TRF 43 1 R18, RES, CHIP, 10k 5% 0603 YAGEO RC0603JR-0710KL 44 1 R21 RES, CHIP, 174k 1% 0603 VISHAY CRCW0603174KFKEA 45 1 R22 RES, CHIP, 107k 1% 0603 NIC NRC06F1073TRF 46 2 R27, R31 RES, CHIP, 0 SHUNT 0402 NIC NRC04ZOTRF 47 1 R28 RES, CHIP, 0 SHUNT 0603 NIC NRC06ZOTRF 48 1 R29 RES, CHIP, 52.3k 1% 0603 VISHAY CRCW060352K3FKEA 49 0 R32 RES, CHIP, OPT 5% 1812 OPT 50 0 R33 RES, CHIP, OPT 5% 0805 OPT 51 1 T3 XFMR, SMD GATE DRIVE, EPA4271GE PCA EPA4271GE 52 0 T3 (ALTERNATE) XFMR, SMD GATE DRIVE, PE-68386NL PULSE PE-68386NL 53 1 U3 IC, POE IDEAL BRIDGE CONTROLLER LT4321IUF QFN16 LINEAR TECH LT4321IUF 54 2 STENCIL (TOP & BOTTOM) STENCIL DC2539A DC2539A-A 1 1 C2 CAP, CER, X5R 10F 16V 10% 1210 MURATA GRM32DR61C106KA01 2 1 C3 CAP, CER, X5R 10F 16V 10% 1210 MURATA GRM32DR61C106KA01 3 1 C4 CAP, ELEC, 47F 35V 20% 6.0X5.8 PANASONIC EEH-ZA1V470P 4 1 C8 CAP, CER, U2J 330pF 630V 5% 1206 MURATA GRM31A7U2J331JW31 5 1 C9 CAP, CER, U2J 220pF 630V 5% 1206 MURATA GRM31A7U2J221JW31 6 1 C16 CAP, CER, X7R 1F 25V 10% 0805 MURATA GRM21BR71E105KA99L 7 1 C22 CAP, CER, X7R 3.3nF 25V 10% 0603 AVX 06033C332KAT2A 8 1 C24 CAP, CER, X7R 0.1F 25V 20% 0603 MURATA GRM188R71E104KA01D 9 1 C25 CAP, CER, X7R 330pF 25V 10% 0603 AVX 06033C331KAT2A 10 0 D18 DIODE, OPT 40V SOD323 OPT 11 1 L1 IND, 220nH WURTH 744316022 12 1 L3 IND, CMC, 6mH, COILCRAFT UA8085-AL 13 1 Q2 MOSFET, N-CH, 150V SOP ADVANCE TOSHIBA TPH1500CNH 14 1 Q4 MOSFET, N-CH, 150V SOP ADVANCE TOSHIBA TPH1500CNH 15 1 R2 RES, CHIP, 1.5k 5% 0805 NIC NRC10J152TRF 16 1 R3 RES, CHIP, 75 5% 1206 VISHAY CRCW120675R0JNEA 17 1 R4 RES, CHIP, 75 5% 1206 VISHAY CRCW120675R0JNEA 18 1 R8 RES, CHIP, 39 5% 1206 VISHAY CRCW120639R0JNEA 19 1 R9 RES, CHIP, 39 5% 1206 VISHAY CRCW120639R0JNEA 20 1 R10 RES, CHIP, 5.62k 1% 0603 VISHAY CRCW06035K62FKEA 21 1 R11 RES, CHIP, 5.23k 1% 0603 YAGEO RC0603FR-075K23L 10 dc2539aafb DEMO MANUAL DC2539A-A Parts List ITEM QTY 22 1 REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R14 RES, CHIP, 20m 1% 2010 VISHAY WSL2010R0200FEA 23 1 R16 RES, CHIP, 0, Shunt, 0805 VISHAY CRCW08050000Z0EA 24 1 R19 RES, CHIP, 47.5 1% 0805 VISHAY CRCW080547R5FKEA 25 1 R20 RES, CHIP, 150 1% 0805 VISHAY CRCW0805150RFKEA 26 0 R23 RES, CHIP, OPT 5% 0603 OPT 27 1 R24 RES, CHIP, 30k 5% 0603 VISHAY CRCW060330K1JNEA 28 1 R25 RES, CHIP, 10k 5% 0603 YAGEO RC0603JR-0710KL 29 1 R26 RES, CHIP, 4.7k 5% 0603 NIC NRC06J472TRF 30 0 R30 RES, CHIP, OPT 5% 0805 OPT 31 1 T1 XFMR, FLYBACK TRANSFORMER, EPC3633G PCA EPC3633G 32 0 T1 (ALTERNATE) XFMR, FLYBACK TRANSFORMER, 750316116 WURTH 750316116 33 1 U1 IC, PD & SWITCHER CONTROLLER, LT4295IUF QFN28 LINEAR TECH LT4295IUF 34 1 ISO1 IC, TRANSISTOR OUTPUT OPTOCOUPLER, SO4 TOSHIBA TLP291(GR-TP,SE) 35 4 MH1-MH4 STAND-OFF, NYLON 0.50" TALL (SNAP ON) KEYSTONE 8833 36 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2539A dc2539aafb 11 A B C D E4 VPORTP E6 E12 E9 FB R32 OPT 5 VSEC_P OPTIONAL COMPONENTS AUX- GND VPORTN VPORTN 37V-57V VPORTP E5 PRODUCTION VPORTP AUX+ 2 1 OPT C21 1 4 2 3 PG 6mH UA8085-BL L3 9-20-2016 KAUNG H. C19 OPT DATE D17 PMEG1020EA OPT C18 C15 OPT 1 R29 52.3K 4 C26 100pF 25V PMEG10020 R21 174K 2 D1 4 8.2 0805 R5 C10 10nF 100V R6 3.3K C12 0.047uF 100V R17 2.00K Q1 PSMN040-100MSE 3 2 1 D16 PTVS58VS1UR 8 7 6 5 4 APPROVED 1 2 R20 150 0805 47.5 0805 4 3 2 14 U1 LT4295IUFD 10uF 100V 6.3x7.7 R19 R10 5.62K L2 4.7uH L5 OPT WURTH 744316470 +C6 HSS RCLASS RCLASS++ AUX FB31 C7 2.2uF 100V 1210 X7R OPT R33 FB R11 5.23K VCC L4 DO1608C-104 C13 100uH 10uF 1206 10V C29 2.2uF 100V 1210 Q7 X7R FMMT723 3 2 1 3 2 5 28 VPORT 26 HSGATE 1 D15 BAV19WS R7 20 0805 0 R34 exposed pad, solder side 3 VCC 20 PG DESCRIPTION T2P 5 107K R22 ITHB ISEN- ISEN+ SG OPT R23 13 16 17 30K R24 3.3nF C22 R31 0 C27 OPT 6.3V R27 0 R4 75 1206 3 4 1 2 6 T3 4.7K R26 330pF C25 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1uF C17 2 VPRI_SG 1 3 EPA4271GE R14 20m 2010 100 R13 Q4 TPH1500CNH VPRI_SW C9 220pF 1206 R3 75 1206 VAUX_P CUSTOMER NOTICE C24 0.1uF R12 0 4 D19 PTVS58VS1UR VPRI_P 5 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. VCC VCC VCC VCC 6 7 8 9 NC DNC GND GND_EP GND 27 22 19 29 1 25 HSSRC 12 FFSDLY 21 VCC 23 SWVCC SFST 11 5 6 7 8 1 2 3 1 2 18 SG 24 VIN ROSC 10 PG RLDCMP 15 C20 2.2nF R8 39 1206 C8 330pF 1206 VSEC_SW C23 4.7nF 4 2 SCALE = NONE K. HTOO PCB DES. K. HTOO 3 D13 2 10K R25 +VOUT T2P ___ +VOUT E3 J4 -VOUT 12V/3.9A E2 J3 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only E11 1uF 0805 C16 R16 0 0805 TECHNOLOGY 3 R30 OPT 0805 D4 LED R2 1.5K 1 DATE: N/A SIZE DEMO CIRCUIT 2539A-A 1 SHEET 1 LT4295IUFD, LT4321IUF Tuesday, September 20, 2016 IC NO. OF 2 2 HIGH EFFICIENCY IEEE 802.3bt (PoE++, Type 3, 51W) PD WITH FLYBACK DC-DC CONVERTER AND AUXILIARY POWER INPUT TITLE: SCHEMATIC 10K R18 15 R15 2 OPT +C5 +VOUT D18 +VOUT OPT 47uF 35V EEH-ZA1V470P +C4 Q5 Q6 PBSS5140T PBSS4140T 4 Q2 TPH1500CNH 744316022 C3 10uF X5R 16V 1210 OPT L1 220nH R35 BAT46WJ,115 ISO1 TLP291(GR-TP,E) APPROVALS APP ENG. C2 10uF X5R 16V 1210 VSEC_P 6VSEC_SG R9 39 1206 11 12 7 8 T1 EPC3633G-LF C1 OPT 1 REVISION HISTORY 1 2 2 1 REV 1 2 4 3 8 7 6 5 3 2 1 1 2 1 12 ECO A B C D DEMO MANUAL DC2539A-A Schematic Diagram dc2539aafb 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. A B C D IN FROM PoE+ PSE CG2 0.01uF 100V 1206 J1 SHIELD SHIELD 5 Q12 POE_CT12 Q11 4BG12 PSMN075-100MSE Q14 POE_CT36 Q13 4TG36 13 14 15 16 9 7 8 2 1 3 5 6 4 10 12 11 Q15 Q16 POE_CT45 4 PSMN075-100MSE 4BG36 CT12 CT36 CT45 CT78 POE_CT12 POE_CT36 POE_CT45 POE_CT78 RT1 75 RT3 75 CG1 1000pF 1808 2KV RT2 75 RT4 75 1 2 3 4 5 6 7 8 SS-6488S-A-NF J2 3 4BG45 PSMN075-100MSE Q18 POE_CT78 PSMN075-100MSE 4TG45 Q17 PSMN075-100MSE 4BG78 PSMN075-100MSE 4TG78 3 VPORTN VPORTP 1 U3 LT4321IUF TG45 TG45 IN45 IN36 TG36 OUT TO PHY POE_CT12 EP 9 17 10 11 VPORTP VPORTN CUSTOMER NOTICE OUTN OUTN EN EN OUTP 12 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. 4 POE_CT45 3 POE_CT36 2 TG36 PoE IDEAL DIODE BRIDGE PSMN075-100MSE VC1 VC2 VC3 VC4 TRD4- TRCT4 TRD4+ TRD3- TRCT3 TRD3+ TRD2- TRCT2 TRD2+ TRD1- TRCT1 4 X 75 Ohms 4 X 12nF PSMN075-100MSE 4TG12 1nF 2kV 7499511001A 18 17 8 7 5 4 6 3 2 TRD1+ 4 9 10 1 8 7 6 5 3 2 1 8 7 6 5 3 2 1 8 7 6 5 3 2 1 8 7 6 5 3 2 1 8 7 6 5 3 2 1 8 7 6 5 3 2 1 8 7 6 5 3 2 1 8 7 6 5 3 2 1 TG12 16 5 TG78 BG36 13 BG36 BG12 TG12 TG78 15 IN12 IN78 POE_CT78 6 1 2 14 BG12 BG78 7 BG78 BG45 8 BG45 0 R28 K. HTOO 2 SCALE = NONE APP ENG. PCB DES. K. HTOO APPROVALS D3 MMSZ5252BS 24V 2 1 DATE 9-20-2016 APPROVED KAUNG H. DATE: N/A SIZE DEMO CIRCUIT 2539A-A 1 SHEET 2 LT4295IUFD, LT4321IUF Tuesday, September 20, 2016 IC NO. OF 2 2 HIGH EFFICIENCY IEEE 802.3bt (PoE++, Type 3, 51W) PD WITH FLYBACK DC-DC CONVERTER AND AUXILIARY POWER INPUT REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only PRODUCTION DESCRIPTION REVISION HISTORY TECHNOLOGY D2 PTVS58VS1UR 2 REV TITLE: SCHEMATIC C11 0.047uF 100V 1 ECO 1 2 5 A B C D DEMO MANUAL DC2539A-A Schematic Diagram dc2539aafb 13 DEMO MANUAL DC2539A-A 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 (c) 2004, Linear Technology Corporation 14 dc2539aafb LT 0517 REV B * PRINTED IN USA (c) LINEAR TECHNOLOGY CORPORATION 2016