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LT1930 Datasheet(PDF) 19 Page - Linear Technology |
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LT1930 Datasheet(HTML) 19 Page - Linear Technology |
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19 / 32 page  LTC1871X 19 1871xf For more information www.linear.com/LTC1871X APPLICATIONS INFORMATION Pulse skipping prevents a loss of control of the output at very light loads and reduces output voltage ripple. Efficiency Considerations: How Much Does VDS Sensing Help? The efficiency of a switching regulator is equal to the out- put power divided by the input power (×100%). Percent efficiency can be expressed as: % Efficiency = 100% – (L1 + L2 + L3 + …), where L1, L2, etc. are the individual loss components as a percentage of the input power. It is often useful to analyze individuallossestodeterminewhatislimitingtheefficiency and which change would produce the most improvement. Although all dissipative elements in the circuit produce losses, four main sources usually account for the majority of the losses in LTC1871X application circuits: 1. The supply current into VIN. The VIN current is the sum of the DC supply current IQ (given in the Electrical Char- acteristics)andtheMOSFETdriverandcontrolcurrents. The DC supply current into the VIN pin is typically about 550µA and represents a small power loss (much less than 1%) that increases with VIN. The driver current resultsfromswitchingthegatecapacitanceofthepower MOSFET; this current is typically much larger than the DC current. Each time the MOSFET is switched on and 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 nec-tokinamerica.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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