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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT1374CS8 датащи(PDF) 32 Page - Linear Technology |
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LT1374CS8 датащи(HTML) 32 Page - Linear Technology |
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32 / 32 page  32 LT1374 1374fb LT/TP 0102 1.5K REV B • PRINTED IN USA ©LINEAR TECHNOLOGY CORPORATION 1998 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 q FAX: (408) 434-0507 q www.linear.com TYPICAL APPLICATION RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1074/LT1076 Step-Down Switching Regulators 40V Input, 100kHz, 5A and 2A LTC ®1148 High Efficiency Synchronous Step-Down Switching Regulator External FET Switches LTC1149 High Efficiency Synchronous Step-Down Switching Regulator External FET Switches LTC1174 High Efficiency Step-Down and Inverting DC/DC Converter 0.5A, 150kHz Burst Mode ® Operation LT1176 Step-Down Switching Regulator PDIP LT1076 LT1370 High Efficiency DC/DC Converter 42V, 6A, 500kHz Switch LT1371 High Efficiency DC/DC Converter 35V, 3A, 500kHz Switch LT1372/LT1377 500kHz and 1MHz High Efficiency 1.5A Switching Regulators Boost Topology LTC1735 High Efficiency Step-Down Converter External Switches, Very High Efficiency LT1765 3A Step-Down Switching Regulator 1.25MHz, 3A, 25V Input, SO-8 and TSSOP16 Packages LT1766 1.5A Step-Down Switching Regulator 200kHz, 1.5A, 60V Input, SO-8 and GN16 Packages LT1767 1.5A Step-Down Switching Regulator 1.25MHz, 1.5A, 25V Input, MS8 Package Burst Mode is a registered trademark of Linear Technology Corporation. BOOST LT1374-5 VIN OUTPUT 5V OUTPUT –5V† * L1 IS A SINGLE CORE WITH TWO WINDINGS BH ELECTRONICS #501-0726 ** TOKIN IE475ZY5U-C304 † IF LOAD CAN GO TO ZERO, AN OPTIONAL PRELOAD OF 1k TO 5k MAY BE USED TO IMPROVE LOAD REGULATION INPUT 6V TO 25V GND 1374 F17 C2 0.27 µF CC 0.01 µF RC 470 Ω D1 MBRD340 C1** 100 µF 10V TANT C5** 100 µF 10V TANT C3 22 µF 35V TANT C4** 4.7nF D2 CMDSH-3 D3 MBRD340 L1A* 6.8 µH L1B* VSW SENSE BIAS GND SHDN VC + + + + Figure 17. Dual Output SEPIC Converter Dual Output SEPIC Converter The circuit in Figure 17 generates both positive and negative 5V outputs with a single piece of magnetics. The two inductors shown are actually just two windings on a standard BH Electronics inductor. The topology for the 5V output is a standard buck converter. The – 5V topology would be a simple flyback winding coupled to the buck converter if C4 were not present. C4 creates the SEPIC (Single-Ended Primary Inductance Converter) topology which improves regulation and reduces ripple current in L1. Without C4, the voltage swing on L1B compared to L1A would vary due to relative loading and coupling losses. C4 provides a low impedance path to maintain an equal voltage swing in L1B, improving regulation. In a flyback converter, during switch on time, all the converter’s energy is stored in L1A only, since no current flows in L1B. At switch off, energy is transferred by magnetic coupling into L1B, powering the – 5V rail. C4 pulls L1B positive during switch on time, causing current to flow, and energy to build in L1B and C4. At switch off, the energy stored in both L1B and C4 supply the – 5V rail. This reduces the current in L1A and changes L1B current waveform from square to triangular. For details on this circuit see Design Note 100. |
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