DEMO MANUAL DC2476A-A LT4295, LT4321 High Efficiency IEEE 802.3bt (PoE++, Type 4, 62W/71W) PD with Flyback DC/DC Converter and Auxiliary Supply Input Description Demonstration Circuit 2476A is an IEEE 802.3bt (Draft 2.2) 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 IEEE 802.3af (PoE, Type 1), IEEE 802.3at (PoE+, Type 2), and IEEE 802.3bt (PoE++, Type 3 and 4) compliant interfacing and power supply control. It utilizes an external, low RDS(on) (30m 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 delivery efficiency and ease thermal design. This solution replaces the eight diodes typically found in a passive PoE rectifier bridge. The DC2476A-A accepts up to 71W of delivered power from a power sourcing equipment (PSE) via the RJ45 connector (J1) or a local 48V DC power supply using the auxiliary supply input. When both supplies are connected, the auxiliary supply input has priority over the PoE input. The DC2476A-A supplies a 24V output at up to 2.7A. Design files for this circuit board are available at http://www.linear.com/demo/DC2476A-A L, LT, LTC, LTM, Linear Technology, LTPoE++ and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Performance Summary PARAMETER CONDITIONS VALUE Port Voltage (VPORT) At RJ45 37V to 57V Auxiliary Voltage From AUX+ to AUX- Terminals Output Voltage (VOUT) 37V to 57V 24V (Typical) Output Current (IOUT) 2.7A (Max) VPORT = 41.2V, IOUT = 2.7A Output Voltage Ripple Load Regulation 200mVP-P (Typical) 0.5% (Typical) VPORT = 50V, IOUT = 2.7A, End-to-End Efficiency Switching Frequency 91.5% (Typical) 250kHz (Typical) Board Photo Top Side Bottom Side dc2476aafb 1 DEMO MANUAL DC2476A-A Typical Performance Characteristics Top Side Bottom Side Figure 1. Thermal Pictures (Conditions: VPORT = 57V, VOUT = 24V, IOUT = 2.7A) Figure 2. Efficiency (End-to-End) 2 Figure 3. Load Regulation dc2476aafb DEMO MANUAL DC2476A-A Typical Performance Characteristics Figure 4. Switch Node Waveforms (Conditions: VPORT = 57V, VOUT = 24V, IOUT = 2.7A) dc2476aafb 3 DEMO MANUAL DC2476A-A Typical Performance Characteristics Figure 5. Output Voltage Ripple (Conditions: VPORT = 41.2V, VOUT = 24V, IOUT = 2.7A) 4 dc2476aafb DEMO MANUAL DC2476A-A Typical Performance Characteristics Figure 6. Load Transient Response (Conditions: VPORT = 41.2V, Load Step: 1.35A to 2.7A to 1.35A) dc2476aafb 5 DEMO MANUAL DC2476A-A Typical Performance Characteristics Figure 7. Gain and Phase Margin of the Flyback DC/DC Converter (Conditions: VPORT = 57V, VOUT = 24V, IOUT = 2.7A) 6 CROSSOVER FREQUENCY GAIN MARGIN PHASE MARGIN 3.8kHz 18dB 64 dc2476aafb DEMO MANUAL DC2476A-A Quick Start Procedure Power over Ethernet (PoE) Input 1. Disconnect auxiliary supply if it is connected to AUX+ and AUX- inputs of the DC2476A-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 DC2476A using a CAT5e or CAT6 Ethernet cable. (See Note.) 5. After the LED (D4) on the DC2476A is lit, check the output voltage using a voltmeter. Output voltage should be within 24.0V 0.3V. + DC POWER SUPPLY - + IEEE 802.3bt PSE 6. Turn on the electronic load and increase its load current up to 2.7A. 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 DC2476A-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-D) may be used to provide power to the DC2476A-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 DC2476A-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 - + VOLT METER - + ELECTRONIC LOAD - + AM METER - - OSCILLOSCOPE + DC2476AA F09 Figure 8. Setup Diagram for PoE Input Table 1. T2P Response PSE IEEE LTPoE++, 90W T2P Response Negotiated PD Input Power Logic High 13W Logic Low 25.5W 50% Logic High/50% Logic Low, Toggle at 976Hz 7% 51W 75% Logic High/25% Logic Low, Toggle at 976Hz 7% 71W Logic Low 71W dc2476aafb 7 DEMO MANUAL DC2476A-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 DC2476A 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 DC2476A is lit, check the output voltage using a voltmeter. Output voltage should be within 24.0V 0.3V. 5. Turn on the electronic load and increase its load current up to 2.7A. 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%. + VOLT METER - + ELECTRONIC LOAD - + AM METER - - OSCILLOSCOPE + DC2476AA F09 + - AUXILIARY SUPPLY Figure 9. Setup Diagram for Auxiliary Supply Input 8 dc2476aafb DEMO MANUAL DC2476A-A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CAP, CER, X7R 1000pF 2kV 10% 1808 MURATA, GR442QR73D102KW01L DC2476A General BOM 1 2 CG1, CG2 2 4 CT1, CT2, CT3, CT4 CAP, CER, X7R 0.01F 100V 20% 0805 MURATA, GRM21BR72A103MA01L 3 0 C1 CAP, CER, OPT 2kV 1812 OPT 4 1 C6 CAP, ELEC, 22F 100V 10% 8x10.2 SUNCON, 100CE22KX 5 2 C7, C29 CAP, CER, X7R 2.2F 100V 10% 1210 MURATA, GRM32ER72A225KA35 6 1 C10 CAP, CER, X7R 10nF 100V 20% 0603 MURATA, GRM188R72A103KA01D 7 1 C11 CAP, CER, X7R 0.047F 100V 20% 0603 KEMET, C0603C473M1RACTU 8 1 C12 CAP, CER, X7R 0.047F 100V 10% 0805 MURATA, GRM21BR72A473KA01L 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 C24 CAP, CER, X7R 0.1F 25V 20% 0603 MURATA, GRM188R71E104KA01D 14 1 C26 CAP, CER, X7R 100pF 16V 10% 0402 AVX, 0402YC101KAT2A 15 0 C27 CAP, CER, X7R OPT 6.3V 10% 0402 OPT 16 1 C30 CAP, CER, X7R OPT 250V 10% 1206 AVX, 12061C103MAT2A 17 1 D1 DIODE, SCHOTTKY, PDS5100H 100V POWERDI5 DIODES INC, PDS5100H 18 3 D2, D16, D19 DIODE, TVS, PTVS58VS1UR 58V SOD123 NXP, PTVS58VS1UR 19 1 D3 DIODE, ZENER, MMSZ5252BS 24V SOD323 DIODES INC, MMSZ5256BS 20 1 D13 DIODE, SCHOTTKY, BAT46WJ, 115 100V SOD323 NXP, BAT46WJ, 115 21 1 D15 DIODE, BAV19WS 120V SOD323 DIODES INC, BAV19WS 22 1 D17 DIODE, SCHOTTKY, PMEG1020EA 10V SOD323 NXP, PMEG1020EA 23 8 E2, E3, E4, E5, E6,E9, E11, TP, TURRET, PAD150-094 0.094" E12 MILL-MAX, 2501-2-00-80-00-00-07-0 24 1 ISO1 TOSHIBA, TLP291(GR-TP, E) OPTO, TLP291(GR-TP, E) 25 2 J1, J2 CONN, RJ-45, SS-6488-NF-K1 STEWART CONNECTOR, SS-6488-NF-K1 26 4 J3, J4, J5, J6 CONN, BANANA JACK KEYSTONE, 575-4 27 1 L2 IND, 4.7H WURTH, 744316470 28 1 L3 IND, CMC, 3.5mH, PCA, EPZ3109G-LF 29 1 L4 IND, 100H COILCRAFT, DO1608C-104MLB 30 0 L6 IND, OPT OPT dc2476aafb 9 DEMO MANUAL DC2476A-A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 31 1 Q1 MOSFET, N-CH, PSMN040-100MSE 100V 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, FMMT723 35 8 Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18 MOSFET, N-CH, PSMN040-100MSE 100V LFPAK33 NXP, PSMN040-100MSE 36 8 RT1, RT2, RT3, RT4, RT5, RT6, RT7, RT8 RES, CHIP, 75 5% 0603 PANASONIC, ERJ-3GEYJ750V 37 1 R5 RES, CHIP, 8.2 5% 0805 PANASONIC, ERJ-P6WJ8R2J 38 1 R6 RES, CHIP, 3.3K 5% 0603 VISHAY, CRCW06033K30FKEA 39 1 R7 RES, CHIP, 20 5% 0805 VISHAY, CRCW080520R0JNEA 40 2 R12, R28 RES, CHIP, 0 5% 0603 PANASONIC, ERJ-3GEY0R00V 41 1 R13 RES, CHIP, 100 5% 0603 PANASONIC, ERJ-3GEYJ101V 42 1 R15 RES, CHIP, 15 5% 0603 VISHAY, CRCW060315R0FKEA 43 1 R17 RES, CHIP, 2.00K 1% 0603 VISHAY, CRCW06032K00FKEA 44 1 R18 RES, CHIP, 10K 5% 0603 VISHAY, CRCW060310K0JNEA 45 1 R21 RES, CHIP, 174K 1% 0603 VISHAY, CRCW0603174KFKEA 46 1 R22 RES, CHIP, 107K 5% 0603 VISHAY, CRCW0603107KFKEA 47 2 R27, R31 RES, CHIP, 0 SHUNT 0402 VISHAY, CRCW04020000Z0EA 48 1 R29 RES, CHIP, 52.3K 1% 0603 PANASONIC, ERJ-3EKF5232V 49 0 R32 RES, CHIP, OPT 1% 1812 OPT 50 0 R33 RES, CHIP, OPT 5% 0805 OPT 51 1 R34 RES, CHIP, 0 SHUNT 0603 PANASONIC, ERJ-3GEY0R00V 52 1 T3 XFMR, SMD GATE DRIVE, PE-68386NL PULSE, PE-68386NL 53 0 T3 (ALTERNATE) XFMR, SMD GATE DRIVE, EPA4271GE-LF PCA, EPA4271GE-LF 54 1 T4 TRANSFORMER, ETHERNET, 749022016 WURTH, 749022016 55 0 T4 (ALTERNATE) TRANSFORMER, ETHERNET, ETH1-460LD COILCRAFT, ETH1-460LD 56 0 T4 (ALTERNATE) TRANSFORMER, ETHERNET, EPG4260S-LF PCA, EPG4260S-LF 57 1 U1 IC, PD & SWITCHER CONTROLLER, LT4295IUFD QFN28 LINEAR TECH, LT4295IUFD#PBF 58 1 U3 IC, POE IDEAL BRIDGE CONTROLLER, LT4321IUF QFN16 LINEAR TECH, LT4321IUF#PBF 59 4 MH1-MH4 60 2 10 STAND-OFF, NYLON 0.50" TALL (SNAP ON) KEYSTONE, 8833 STENCILS (TOP & BOTTOM) STENCIL, DC2476A dc2476aafb DEMO MANUAL DC2476A-A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC2476A-A 1 1 C2 CAP, CER, X5R 10F 50V 10% 1210 MURATA, GRM32ER61H106KA12 2 0 C3 CAP, CER, X5R OPT 50V 10% 1210 OPT 3 1 C4 CAP, ELEC, 47F 35V 20% PANASONIC, EEE-FK1V470P 4 0 C5 CAP, ELEC, OPT 35V 20% OPT 5 1 C8 CAP, CER, U2J 330pF 630V 5% 1206 MURATA, GRM31A7U2J331JW31 6 1 C9 CAP, CER, U2J 220pF 630V 5% 1206 MURATA, GRM31A7U2J221JW31 7 1 C16 CAP, CER, X7R 0.1F 25V 10% 0805 MURATA, GRM21BR71E104KA01L 8 1 C22 CAP, CER, X7R 3.3nF 25V 10% 0603 MURATA, GRM188R71E332KA01D 9 1 C23 CAP, CER, X7R 4.7nF 2kV 1812 MURATA, GR443DR73D472KW01L 10 1 C25 CAP, CER, X7R 330pF 25V 10% 0603 AVX, 06033C331KAT2A 11 0 D18 DIODE, DIODE INC, OPT 30V SOD323 OPT 12 1 L5 IND, 1H WURTH, 744316100 13 1 Q2 MOSFET, N-CH, BSC320N20NS3 200V SUPERSO8 INFINEON, BSC320N20NS3 14 1 Q4 MOSFET, N-CH, BSC190N15NS3 150V SUPERSO8 INFINEON, BSC109N10NS3 G 15 2 R3, R4 RES, CHIP, 51 5% 2010 VISHAY, CRCW201051R0JNEF 16 2 R8, R9 RES, CHIP, 36 5% 2010 PANASONIC, ERJ-12ZYJ360U 17 1 R10 RES, CHIP, 3.65K 1% 0603 VISHAY, CRCW06033K65FKEA 18 1 R11 RES, CHIP, 5.23K 5% 0603 VISHAY, CRCW06035K23FKEA 19 1 R14 RES, CHIP, 15m 1% 2010 VISHAY, WSL2010R0150FEA 20 1 R16 RES, CHIP, 0 SHUNT 0805 VISHAY, CRCW08050000Z0EA 21 1 R19 RES, CHIP, 118 1% 0805 PANASONIC, ERJ-6ENF1180V 22 1 R20 RES, CHIP, 52.3 1% 0805 VISHAY, CRCW080552R3FKEA 23 1 R23 RES, CHIP, 36K 5% 0603 VISHAY, CRCW060336K0FKEA 24 1 R24 RES, CHIP, 51K 5% 0603 VISHAY, CRCW060351K0JNEA 25 1 R25 RES, CHIP, 20K 5% 0603 PANASONIC, ERJ-3EKF2002V 26 1 R26 RES, CHIP, 4.7K 5% 0603 YAGEO, RC0603JR-074K7L 27 0 R30 RES, CHIP, OPT 5% 0805 OPT 28 0 R35 RES, CHIP, OPT 5% 2010 OPT 29 1 T1 XFMR, PWR TRAN, EPC3630G-LF PCA, EPC3630G-LF 30 0 T1 (ALTERNATE) 31 1 XFMR, PWR TRAN, 750316231 WURTH, 750316231 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2476A dc2476aafb 11 A B C D VPORTP J3 E5 J4 E6 E12 2 1 L3 3.5mH EPZ3109G 3 4 FB R32 OPT VSEC_P C18 OPT C15 OPT 5 *CHANGE R19 TO 64.9 OHM AND R20 TO 80.6 OHM TO MAKE THE DC2476A CLASSIFY AS 62W PD. GND VPORTN C21 OPT C19 OPT 9-6-2016 KAUNG H. OPTIONAL COMPONENTS VPORTP PRODUCTION 37V-57V 1 1 DATE R29 52.3K 4 C26 100pF 25V 1 D1 PDS5100H R21 174K 3 2 4 1 2 R6 3.3K C10 10nF 100V 0.047uF 100V C12 D16 PTVS58VS1UR 0805 8.2 R5 R17 2.00K Q1 PSMN040-100MSE 8 3 7 2 6 1 5 4 APPROVED R19* 118 0805 R20* 52.3 0805 4 3 2 14 C7 2.2uF 100V 1210 X7R R33 OPT RCLASS RCLASS++ AUX FB31 WURTH 744316470 C6 22uF 100V 8x10.2 L2 4.7uH L6 OPT U1 LT4295IUFD R10 3.65K + HSS 26 PG 0 R34 R11 5.23K VCC L4 DO1608C-104 C13 100uH 10uF 1206 10V C29 2.2uF 100V 1210 Q7 X7R FMMT723 FB 3 2 1 3 2 5 28 VPORT 1 D15 BAV19WS R7 20 exposed pad, solder side 3 D17 PMEG1020EA VCC 20 PG DESCRIPTION T2P 5 107K R22 ITHB ISEN- ISEN+ SG 36K R23 13 16 17 R27 0 51K R24 3.3nF C22 R31 0 C27 OPT 6.3V 4 R4 51 2010 3 4 1 2 6 T3 4.7K R26 330pF C25 1uF C17 VPRI_SG 1 3 PE-68386NL R14 15m 2010 100 R13 Q4 BSC190N15NS3 150V VPRI_SW C9 220pF 1206 R3 51 2010 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE C24 0.1uF R12 0 D19 PTVS58VS1UR VPRI_P VAUX_P 5 2 C20 2.2nF 2 SCALE = NONE APPROVALS D13 744316100 L5 1uH OPT R35 BAT46WJ,115 PBSS4140T 2 3 PBSS5140T 3 2 T2P +VOUT E3 J6 DATE: N/A SIZE 1 LT4295IUFD, LT4321IUF Wednesday, August 02, 2017 IC NO. -VOUT SHEET 1 1 OF 2 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only ___ C16 0.1uF 0805 R16 0 0805 E2 24V/2.7A D4 LED R2 3K J5 HIGH EFFICIENCY IEEE 802.3bt (TYPE 4) PD WITH FLYBACK DC-DC CONVERTER WITH AUXILIARY POWER INPUT TECHNOLOGY 20K R25 +VOUT 10K R18 15 R15 1 D18 OPT +VOUT R30 OPT 0805 E11 Q6 Q5 OPT +C5 +VOUT 47uF 35V EEE-FK1V470P +C4 Q2 BSC320N20NS3 200V 4 TITLE: SCHEMATIC ISO1 TLP291(GR-TP,E) C23 4.7nF 4 C3 OPT R8 36 2010 C8 330pF 1206 C2 10uF X5R 50V 1210 R9 36 2010 VSEC_SW 6VSEC_SG 11 12 7VSEC_P 8 T1 EPC3630G-LF C1 OPT LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL K. HTOO APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT K. HTOO PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. VCC VCC VCC VCC 6 7 8 9 HSGATE 25 HSSRC 12 FFSDLY 21 VCC 23 SWVCC SFST 11 1 2 18 SG 24 PG VIN ROSC 10 RLDCMP 15 8 7 6 5 3 2 1 REVISION HISTORY 1 5 6 7 8 1 2 3 2 1 REV 1 2 NC DNC GND GND_EP GND 27 22 19 29 1 1 2 4 3 1 2 1 12 ECO A B C D DEMO MANUAL DC2476A-A Schematic Diagram dc2476aafb 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 5 IN FROM PoE+ PSE J1 9 POE_CT36 POE_CT45 POE_CT78 CT36 CT45 CT78 Q11 POE_CT12 Q12 Q14 PSMN040-100MSE 4BG12 Q13 POE_CT36 PSMN040-100MSE 4TG12 POE_CT12 CT12 Shield C30 0.01uF 1206 SS-6488-NF-K1 1 2 3 4 5 6 7 8 Shield Q15 Q16 4 PSMN040-100MSE 4BG36 POE_CT45 PSMN040-100MSE 4TG36 CT3 0.01uF 100V 0805 CT2 0.01uF 100V 0805 CT1 0.01uF 100V 0805 CG2 1000pF 1808 2KV RT3 75 RT2 75 RT1 75 22 24 23 19 21 20 16 18 17 13 15 14 DTD D+ DTD D+ DTD D+ DTD D+ 749022016 CT4 0.01uF 100V 0805 RT4 75 XTX X+ XTX X+ XTX X+ XTX X+ T4 3 1 2 6 4 5 9 7 8 12 10 11 RT5 75 RT7 75 CG1 1000pF 1808 2KV RT6 75 3 Q18 PSMN040-100MSE 4BG45 POE_CT78 PSMN040-100MSE 4TG45 Q17 PSMN040-100MSE 4BG78 PSMN040-100MSE 4TG78 3 4 POE_CT45 TG45 TG45 IN45 IN36 TG36 1 2 3 4 5 6 7 8 EP 9 17 10 11 12 VPORTP OUT TO PHY VPORTN CUSTOMER NOTICE OUTN OUTN EN EN OUTP SS-6488-NF-K1 J2 0 R28 APPROVALS D3 MMSZ5252BS 24V 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 SCALE = NONE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. K. HTOO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. K. HTOO CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 2 POE_CT36 LT4321IUF 1 U3 RT8 75 TG36 3 VPORTN VPORTP PoE IDEAL DIODE BRIDGE 4 15 POE_CT12 10 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 BG12 9 10 TG12 16 5 TG12 6 TG78 BG36 TG78 IN12 IN78 13 BG36 POE_CT78 1 2 14 BG12 BG78 7 BG78 BG45 8 BG45 1 DATE 9-6-2016 APPROVED KAUNG H. DATE: N/A SIZE 1 LT4295IUFD, LT4321IUF Tuesday, November 15, 2016 IC NO. SHEET 2 1 REV. OF 2 HIGH EFFICIENCY IEEE 802.3bt (TYPE 4) PD WITH FLYBACK DC-DC CONVERTER AND AUXILIARY POWER INPUT 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 1 REV TITLE: SCHEMATIC C11 0.047uF 100V 1 ECO 1 2 5 A B C D DEMO MANUAL DC2476A-A Schematic Diagram dc2476aafb 13 DEMO MANUAL DC2476A-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 dc2476aafb LT 0817 REV B * PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2016