== !48V !"#$%&'()*+, ! 261 Kurk Mathews !"48V !"#$%&'()*+, !"#$%&'()*+,- ./01* !"#$%&' ()*+,-"./0 !"#$%&'()*+,-./0123 LT®1681 / LTC®1698 !"#$%&'( !"#$%&'()*+,-.$/012 !"#$%&'()*+,-./0123 !"#$ L T 1 6 8 1 !"#$%&'( )*+, !"#$%LTC1698 !"#$%&'( !"LT1681 !"#$250kHz ! !7 5 V !"#$%&'($)*+,= / !"#$%&'"()*+,-./ LTC1698LT1681 !"#$%&'()* !"#$%&'()*+,-./012 1 : !"#$3.3V/20A 95 36VIN 90 EFFICIENCY (%) 48V3.3V !" 336V IN - 72VIN 3.3V OUT/20A !" !"#$%&'()*+= 3 0 = E = 5 F !"#$%&'()*+,-./012 !"#$%#&'()*+LTC1698 ! !"#$%&'L T 1 6 8 1 !"#$ MOSFET !"#$%2 LTC1698 !"#$%&'()*+#,-./4 3 1 !"#$%&'()*+,-./0123 !"#±5% !"#$%&'()*+, !"#$%&'()*+,-./012 !"#$%&'E1F LT1681 / LTC1698 !"#$%&'()*+, !"#$%&'()*+,-#./012 12/01/261 72VIN 85 48VIN 80 75 70 2 4 6 8 10 12 14 CURRENT (A) 16 18 20 dn261f02 2 : 3.3V =EPF !"#$%&'()*+,LT1681 / LTC1698 !"#$%&'()*+,-./0 =====LTC =LT !"#$%&'( !"# http: // www. linear-tech.com/go/dnLTC1698 http: // www. linear-tech.com/go/dnLT1681 !"#!$%& OOT ! NSNM 200003 (86)21-6375-9478 (86)21-6375-9479 !"#$% Cytech Technology Ltd. www.cytecht.com !"#$ ! !"#$% Unique-A Division of Memec (Asia Pacific) Ltd. www.unique-ap.com !"(852)2375-8866 (852)2375-7700 [email protected] !"(010)8268-4280 !"(028)522-4111 !"(023)6860-8938 !"(020)8762-7232 !"(025)481-0877 !"(021)6440-1373 !"(0755)386-7431 !"(029)848-1716 !"(027)8736-0546 C2 1.5µF 100V C3 1.5µF 100V (010)8268-4277 (028)523-9451 (023)6860-8938 (020)8762-7227 (025)480-8023 (021)6440-0166 (0755)386-7954 (029)848-0985 (027)8736-0547 !"(852)2410-2778 !"(010)8519-1866 !"(028)620-0026 !"(021)3303-0261 !"(0755)366-4329 !"(027)8732-2646 !"(0592)516-4701 !"(029)822-9180 (852)2370-3247 (010)8519-1865 (028)620-0027 (021)6317-3446 (0755)366-4330 (027)8732-2729 (0592)516-4702 (029)825-8595 0.1µF C26 68µF 20V + MMBZ5248LT1 18V 10k MMBZ5245LT1 15V 267k 0.25W 1nF 24k 1.24k 1% 56k 20k 73.2k 1% 20 17 19 18 16 11 12 15 BAS21 BAS21 BAT54 330pF 10k BAT54 MMBT3906LT1 Q12 ZVN3310F 10Ω 1µF MMBT3906LT1 5VREF 52.3k 1% 5 6 4 4700pF 7 8 3k 3300pF 10Ω 10 3 1• 4 •6 1k 5 8 S 2 1 T1 4 2 14 5 10k 15 3 4700pF 1k 220pF S Q1 12 11 16 2 100Ω 2k 0.25W 6 0.1µF VAUX OPTODRV SYNC MARGIN OVPIN 3 4 10 PGND GND PWRGD ICOMP LTC1698 VFB 1.24k 1% 13 7 9 8 1k 1000pF S L2 2.35µH 2.43k 1% dn261f03 1k 0.33µF 1.78k 1% 3.01k Q6, Q15, Q17 FDS6680A ×3 MMBZ5240BLT1 10V 0.22µF 50V MBR0540 4.7Ω 1000pF 100V 0.022µF 1000pF 100V 10Ω 0.25W 10Ω 0.25W VDD ISNS ISNSGND FG CG VCOMP 1 4.7µF 16V Q13 FZT690 Q5, Q14 FDS6680A ×2 C1 2200pF 250V 3.3Ω 5 7 VSEC 3 : 36V - 72V DC =3.3V/20A !"#$%&' 82pF 3 0.1µF T2 ISO1 5VREF MOC207 4 3 1 7 6 3.3Ω BAT54 0.025Ω 1/2W Q3 MURS120T3 MMBT3906LT1 MURS120T3 VCC VBST BLKSENS TG BSTREF BG SENSE IMAX PGND 13 SG 2 LT1681 OVLO 9 1 THERM SYNC SGND SS VC VFB SHDN 5VREF FSET 14 BAS21 0.1µF 100V L3 1mH C4 1.5µF 100V 10Ω • L1 3.3µH C1: MURATA ERIE GHM3045X7R222K-GC C2, C3, C4: VITRAMON VJ1825Y155MXB C5 TO C8: 330µF 10V KEMET T510X337K010AS C26: AVX TPSE686M020R0150 ISO1: QT OPTOELECTRONICS MOC207 L1: COILCRAFT DO1608C-332 L2: PULSE P1977 PLANAR INDUCTOR L3: COILCRAFT DO1608C-105 Q1, Q3: SILICONIX Si4486EY Q5, Q6, Q14,Q15, Q17: FAIRCHILD FDS6680A Q12: ZETEX ZVN3310F Q13: ZETEX FZT690 T1: PULSE P1976 PLANAR TRANSFORMER T2: MIDCOM 31264R VIN– VIN+ • • !"# Linear Technology Corporation Ltd. www.linear.com.cn !"#$#% OOP !" O ONMU (852)2428-0303 (852)2348-0885 !"#$%&'()*+,-./0 !"#$%&'()*+,-./ www.linear-tech.com =www.linear.com.cn dn261f 1001 29K • PRINTED IN CHINA LINEAR TECHNOLOGY CORPORATION 2001 + TRIM S VOUT– C5 TO C8 330µF 10V ×4 VOUT+