5 4 3 J1 SS-6488-NF-K1 IN FROM HIGH POWER PSE 1 TX+ 2 TX- 3 RX+ 6 4 SPARE1 7 6 TD+ 1 10 5 TCT 2 TD- TXCT 11 3 OUT 4 RD+ 4 RXCT TO 12 3 RCT 5 PHY 13 2 RD- 6 SPARE2 8 R5 75 R4 75 R1 51K 1% VPORTP C15 0.01uF 100V C14 0.01uF 100V C16 0.01uF 100V C13 0.01uF 100V 14 R6 75 1 1 1 C6 2.2uF 100V 1210 10uF 100V D11 BAS21 R9 * 1206 D5 E5 RXCT VPORT_N C19 1uF 16V 0805 C18 * 3528 C9 * 1206 * 3528 R33 * D15 LED GREEN E3 R34 * 1206 -VOUT * Q2 * C C4 * 0805 Q1 FDS2582 18 R21 24K UVLO 2 19 R23 12K R24 100K R25 * R26 38.3K E11 C27 1uF 16V 0805 C26 * R27 * C30 33pF C31 Opt. +VOUT IOUT Q7 MMBT3904 3 2 C33 * C32 0.1uF 2 R15 * R35 * 3 C24 1uF 16V 0805 R22 15 1% C28 2.2nF B 6 T2 PE-68386 D14 BAT54 R28 10K 1 4 2 C11 2.2nF 2KV E13 GND D10 R9 R13 R15 R25 R27 R33 R34 R35 L1 B0540W 20K 28.7K 47 1K 5.1K 270 5.1 Opt. 180nH 1nF Opt. 39K 27.4K Opt. 1.21K 10K 620 5.1 0 180nH 1nF Opt. 20K 29.4K Opt. 2.2K 10K 2K 15 0 330nH C1 C3 C4 C7 C9 C10 C18 C26 C33 3.3V 7A 22uF 22uF 2.2nF 22pF Opt. 100uF 22uF 6.8nF 2.2nF DC1335B-B 5V 5A 22uF 22uF 1.5nF 22pF Opt. 100uF 10uF 3.3nF DC1335B-C 12V 2A 4.7uF 4.7uF 470pF 47pF Opt. 47uF 22uF 4.7nF T1 Q2 EPC3408G-LF or PA2466NL PA2369NL or EPC3409G-LF PA2467NL or EPC3410G-LF CUSTOMER NOTICE FDS8670 FDS8880 FDS3572 APPROVALS 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 APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 Q6 MMBT3906 R17 100 33 GND CCMP 21 SFST OSC 14 15 ENDLY SYNC RCMP 12 22 13 TON PGDLY 11 17 1 R36 30.9 1% D16 BAS21 23 3 NC VNEG VNEG R20 3.01K 1% 1 SG VCC PG 9 24 10 8 NC 25 31 NC T2P NC 2 30 29 SENSESHDN 3 C25 Opt. E12 VPORTN NC VCMP R19 14.0K 1% AUX- R16 0.033 1/2W exposed pad, solder side 28 27 26 E10 20 1 1 SENSE+ 1 3 4 D10 * FB D12 S1B DC1335B-A +C10 C3 * 1206 3 Q5 BSS63LT1 E9 R18 10.0K 1% 16 VPORTP NC VPORTN VPORTN 1 SPARE2 R12 383K 1% 1 * +VOUT * E1 C1 * 1206 C7 * 1206 3 ASSY +VOUT 6 7 R11 0 /PWRGD 2 D9 32 2 R14 107K 1% RCLASS SPARE1 E8 1 AUX- L1 * 10 9 E6 PWRGD U1 LTC4269IDKD-1 D13 36V PDZ36B 7 6 5 D8 PD IN = 37V - 57V B T2P R13 * Auxiliary Supply 48V, 30W AUX+ 03-10-10 3 + PWRGD PWRGD E7 D6 SPARE2 T1 * TXCT D7 SPARE1 E14 E4 1 RXCT D2 R2 150 1206 3 1 2 +C5 D1 SMAJ58A R10 20 TXCT DATE RYAN H. R8 20K 5 B1100 x 8 places APPROVED R7 75 VPORTP E2 DESCRIPTION PRODUCTION REBUILD W CHANGES 3 2 C8 0.1uF 100V C 2 4 2 VPORTP D4 REV 1 D 1 L2 10uH DO1608C-103 D3 ECO U2 PS2801-1-L C17 1000pF 2KV VPORT_P 1 REVISION HISTORY J2 Opt. 9 5 D 2 T3 ETH1-230LD 4 3 TECHNOLOGY KT RYAN H. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC HIGH POWER, HIGH EFFICIENCY POE PD INTERFACE WITH INTEGRATED SWITCHING REGULATOR SIZE IC NO. REV. LTC4269IDKD-1 2 DEMO CIRCUIT 1335B SCALE = NONE 2 DATE: Wednesday, March 10, 2010 SHEET 1 1 OF 1 A