LTC1700_ 查看數據表（PDF） - Linear Technology
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LTC1700_ Datasheet PDF : 32 Pages
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LTC1871-7
APPLICATIO S I FOR ATIO
Table 1. Recommended Component Manufacturers
VENDOR
COMPONENTS
TELEPHONE
AVX
Capacitors
(207) 282-5111
BH Electronics
Inductors, Transformers (952) 894-9590
Coilcraft
Inductors
(847) 639-6400
Coiltronics
Inductors
(407) 241-7876
Diodes, Inc
Diodes
(805) 446-4800
Fairchild
MOSFETs
(408) 822-2126
General Semiconductor
Diodes
(516) 847-3000
International Rectifier
MOSFETs, Diodes
(310) 322-3331
IRC
Sense Resistors
(361) 992-7900
Kemet
Tantalum Capacitors (408) 986-0424
Magnetics Inc
Toroid Cores
(800) 245-3984
Microsemi
Diodes
(617) 926-0404
Murata-Erie
Inductors, Capacitors (770) 436-1300
Nichicon
Capacitors
(847) 843-7500
On Semiconductor
Diodes
(602) 244-6600
Panasonic
Capacitors
(714) 373-7334
Sanyo
Capacitors
(619) 661-6835
Sumida
Inductors
(847) 956-0667
Taiyo Yuden
Capacitors
(408) 573-4150
TDK
Capacitors, Inductors (562) 596-1212
Thermalloy
Heat Sinks
(972) 243-4321
Tokin
Capacitors
(408) 432-8020
Toko
Inductors
(847) 699-3430
United Chemicon
Capacitors
(847) 696-2000
Vishay/Dale
Resistors
(605) 665-9301
Vishay/Siliconix
MOSFETs
(800) 554-5565
Vishay/Sprague
Capacitors
(207) 324-4140
Zetex
Small-Signal Discretes (631) 543-7100
WEB ADDRESS
avxcorp.com
bhelectronics.com
coilcraft.com
coiltronics.com
diodes.com
fairchildsemi.com
generalsemiconductor.com
irf.com
irctt.com
kemet.com
mag-inc.com
microsemi.com
murata.co.jp
nichicon.com
onsemi.com
panasonic.com
sanyo.co.jp
sumida.com
t-yuden.com
component.tdk.com
aavidthermalloy.com
tokin.com
tokoam.com
chemi-com.com
vishay.com
vishay.com
vishay.com
zetex.com
Please note that the input capacitor can see a very high
surge current when a battery is suddenly connected to the
input of the converter and solid tantalum capacitors can
fail catastrophically under these conditions. Be sure to
specify surge-tested capacitors!
Burst Mode Operation and Considerations
The choice of sense resistor and inductor value also
determines the load current at which the LTC1871-7
enters Burst Mode operation. When bursting, the control-
ler clamps the peak inductor current to approximately:
IBURST(PEAK)
=
30mV
RSENSE
18
which represents about 20% of the maximum 150mV
SENSE pin voltage. The corresponding average current
depends upon the amount of ripple current. Lower induc-
tor values (higher ∆IL) will reduce the load current at which
Burst Mode operations begins, since it is the peak current
that is being clamped.
The output voltage ripple can increase during Burst Mode
operation if ∆IL is substantially less than IBURST. This can
occur if the input voltage is very low or if a very large
inductor is chosen. At high duty cycles, a skipped cycle
causes the inductor current to quickly decay to zero.
However, because ∆IL is small, it takes multiple cycles for
the current to ramp back up to IBURST(PEAK). During this
inductor charging interval, the output capacitor must
18717f
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