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LTC3704 Datasheet(PDF) 18 Page - Linear Technology |
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LTC3704 Datasheet(HTML) 18 Page - Linear Technology |
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18 / 28 page  18 LTC3704 sn3704 3704fs I D f V L RMS COUT MAX O () • (– ) • ≥ 1 12 1 2 It should be noted that these equations assume no cou- pling between the inductors. If the inductors are wound on the same core, the ripple currents at the input and output can be tuned to very low values, and so the equations above would be extremely conservative. It is highly rec- ommended that the user experiment in the lab with the same magnetics and capacitors which will be used in production. Note that the ripple current ratings from capacitor manu- facturers are often based on only 2000 hours of life. This makes it advisable to further derate the capacitor or to choose a capacitor rated at a higher temperature than required. Several capacitors may also be placed in parallel to meet size or height requirements in the design. Manufacturers such as Nichicon, United Chemicon and Sanyo should be considered for high performance through- hole capacitors. The OS-CON semiconductor dielectric capacitor available from Sanyo has the lowest product of ESR and size of any aluminum electrolytic, at a somewhat higher price. In surface mount applications, multiple capacitors may have to be placed in parallel in order to meet the ESR or RMS current handling requirements of the application. APPLICATIO S I FOR ATIO Table 1. Recommended Component Manufacturers VENDOR COMPONENTS TELEPHONE WEB ADDRESS AVX Capacitors (207) 282-5111 avxcorp.com BH Electronics Inductors, Transformers (952) 894-9590 bhelectronics.com Coilcraft Inductors (847) 639-6400 coilcraft.com Coiltronics Inductors (407) 241-7876 coiltronics.com Diodes, Inc Diodes (805) 446-4800 diodes.com Fairchild MOSFETs (408) 822-2126 fairchildsemi.com General Semiconductor Diodes (516) 847-3000 generalsemiconductor.com International Rectifier MOSFETs, Diodes (310) 322-3331 irf.com IRC Sense Resistors (361) 992-7900 irctt.com Kemet Tantalum Capacitors (408) 986-0424 kemet.com Magnetics Inc Toroid Cores (800) 245-3984 mag-inc.com Microsemi Diodes (617) 926-0404 microsemi.com Murata-Erie Inductors, Capacitors (770) 436-1300 murata.co.jp Nichicon Capacitors (847) 843-7500 nichicon.com On Semiconductor Diodes (602) 244-6600 onsemi.com Panasonic Capacitors (714) 373-7334 panasonic.com Sanyo Capacitors (619) 661-6835 sanyo.co.jp Sumida Inductors (847) 956-0667 sumida.com Taiyo Yuden Capacitors (408) 573-4150 t-yuden.com TDK Capacitors, Inductors (562) 596-1212 component.tdk.com Thermalloy Heat Sinks (972) 243-4321 aavidthermalloy.com Tokin Capacitors (408) 432-8020 tokin.com Toko Inductors (847) 699-3430 tokoam.com United Chemicon Capacitors (847) 696-2000 chemi-com.com Vishay/Dale Resistors (605) 665-9301 vishay.com Vishay/Siliconix MOSFETs (800) 554-5565 vishay.com Vishay/Sprague Capacitors (207) 324-4140 vishay.com Zetex Small-Signal Discretes (631) 543-7100 zetex.com |
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