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| 型号： | LT3430IFE-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 16TSSOP |
| 标准包装： | 95 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 54 V |
| 输入电压： | 5.5 V ~ 60 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
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LT3430/LT3430-1
APPLICATIONS INFORMATION
I LP - P ( V OUT )( V IN – V OUT )
2 2 )( V IN )( )( )
(
Peakswitchandinductorcurrentcanbesigni?cantlyhigher
than output current, especially with smaller inductors
and lighter loads, so don’t omit this step. Powdered iron
cores are forgiving because they saturate softly, whereas
ferrite cores saturate abruptly. Other core materials fall
somewhere in between. The following formula assumes
continuous mode of operation, but errs only slightly on
the high side for discontinuous mode, so it can be used
for all conditions.
I PEAK = I OUT + = I OUT +
f L
EMI
The LT3430/LT3430-1 are able to maintain peak switch
current limit over the full duty cycle range by using patented
circuitry* to cancel the effects of slope compensation
on peak switch current without affecting the frequency
compensation it provides.
Maximum load current would be equal to maximum switch
current for an in?nitely large inductor , but with ?nite
inductor size, maximum load current is reduced by one-
half peak-to-peak inductor current (I LP-P ). The following
formula assumes continuous mode operation, implying
that the term on the right is less than one-half of IP.
I OUT(MAX) =
Continuous Mode
( V OUT + V F ) ( V IN ? V OUT V F )
Decideifthedesigncantoleratean“open”coregeometry
like a rod or barrel, which have high magnetic ?eld radiation,
or whether it needs a closed core like a toroid to prevent
EMI problems. This is a tough decision because the rods
I P –
I LP-P
2
=I P ?
2 ( L )( f ) ( V I N )
–
( 5 + 0 . 52 ) ( 12 ? 5 – 0 . 52 )
2 ( )( ) ( 12 )
I OUT ( MAX ) = 3 ? ? 6
( 5 + 0 . 52 ) ( 24 ? 5 – 0 . 52 )
2 ( 15 ? 10 ? 6 )( 200 ? 10 3 ) ( 24 )
or barrels are temptingly cheap and small and there are
no helpful guidelines to calculate when the magnetic ?eld
radiation will be a problem.
Additional Considerations
After making an initial choice, consider additional factors
such as core losses and second sourcing, etc. Use the
experts in Linear Technology’s Applications department
if you feel uncertain about the ?nal choice. They have ex-
perience with a wide range of inductor types and can tell
you about the latest developments in low pro?le, surface
mounting, etc.
Maximum Output Load Current
Maximum load current for a buck converter is limited by
the maximum switch current rating (I P ). The current rating
for the LT3430/LT3430-1 is 3A. Unlike most current mode
converters, the LT3430/LT3430-1 maximum switch current
For V OUT = 5V, V IN = 12V, V F(D1) = 0.52V, f = 200kHz and
L = 15μH:
15 ? 10 200 ? 10 3
= 3 ? 0 . 5 = 2 . 5 A
Note that there is less load current available at the higher
input voltage because inductor ripple current increases.
At V IN = 24V, duty cycle is 23% and for the same set of
conditions:
I OUT ( MAX ) = 3 ?
= 3 ? 0 . 71 = 2 . 29 A
To calculate actual peak switch current with a given set
of conditions, use:
( V OUT + V F ) ( V IN ? V OUT F )
limit does not fall off at high duty cycles. Most current
mode converters suffer a drop off of peak switch current
for duty cycles above 50%. This is due to the effects of
slope compensation required to prevent subharmonic
oscillations in current mode converters. (For detailed
analysis, see Application Note 19.)
I SW ( PEAK ) = I OUT +
= I OUT +
I L P -P
2
2 ( L )( f )( V IN )
– V
*US Patent # 6,498,466
34301fa
11
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| LT3431EFE#PBF | 功能描述:IC REG BUCK ADJ 3A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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