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| 型号： | LTC1871IMS#TRPBF-1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件页数： | 10/36页 |
| 文件大小： | 354K |
| 代理商： | LTC1871IMS#TRPBF-1 |
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18
LTC1871-1
18711fa
pedance determines the size of the input capacitor, which
is typically in the range of 10
μFto100μF.AlowESRcapaci-
tor is recommended, although it is not as critical as for the
output capacitor.
The RMS input capacitor ripple current for a boost con-
verter is:
I
V
Lf
D
RMS CIN
IN MIN
MAX
()
.
= 03
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 MOSFET RDS(ON) and inductor value also
determines the load current at which the LTC1871-1
enters Burst Mode operation. When bursting, the control-
ler clamps the peak inductor current to approximately:
I
mV
R
BURST PEAK
DS ON
()
=
30
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
ΔIL)willreducetheloadcurrentatwhich
Burst Mode operations begins, since it is the peak current
that is being clamped.
APPLICATIO S I FOR ATIO
WU
UU
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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