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参数资料
| 型号： | LT1766IGN#TR |
| 厂商： | Linear Technology |
| 文件页数： | 12/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.5A 16SSOP |
| 标准包装： | 2,500 |
| 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： | 200kHz |
| 电流 - 输出： | 1.5A |
| 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-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-SSOP |
| 其它名称： | LT1766IGNTR |
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LT1766/LT1766-5
APPLICATIONS INFORMATION
( V OUT )( V IN – V OUT )
( V IN )( f )( L )
where:
ESR = equivalent series resistance of the output
capacitor
ESL = equivalent series inductance of the output
capacitor
dI/dt = slew rate of inductor ripple current = V IN /L
Peak-to-peak ripple current (I LP-P ) through the inductor
and into the output capacitor is typically chosen to be
between 20% and 40% of the maximum load current. It
is approximated by:
I LP - P =
Example: with V IN = 40V, V OUT = 5V, L = 47μH, ESR = 0.1Ω
If maximum load current is 0.5A, for instance, a 0.5A
inductor may not survive a continuous 2A overload con-
dition. Dead shorts will actually be more gentle on the
inductor because the LT1766 has frequency and current
limit foldback.
Peak switch and inductor current can be signi?cantly higher
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
Table 2
VENDOR/ VALUE I DC DCR HEIGHT
PART NO. (μH) (AMPS) (OHMS) (mm)
Coiltronics
( 5 ) ( 40 ? 5 )
(
)(
)
( 40 ) 47 ? 10 200 ? 10 3
I P-P = = 0 . 465 A
= = 10 6 ? 0 . 85
V RIPPLE = ( 0 . 465 A )( 0 . 1 ) + ( 10 ? 10 )( 10 6 ) ( 0 . 85 )
andESL=10nH,outputripplevoltagecanbeapproximated
as follows:
? 6
dI 40
dt 47 ? 10 ? 6
? 9
= 0 . 0465 + 0 . 0085 = 55 mV P-P
To reduce output ripple voltage further requires an increase
in the inductor value or a reduction in the capacitor ESR.
The latter can effect loop stability since the ESR forms
a useful zero in the overall loop response. Typically the
inductor value is adjusted with the trade-off being a
physically larger inductor with the possibility of increased
component height and cost. Choosing a smaller inductor
with lighter loads may result in discontinuous operation
but the LT1766 is designed to work well in both continuous
or discontinuous mode.
Peak Inductor Current and Fault Current
To ensure that the inductor will not saturate, the peak
inductor current should be calculated knowing the
maximum load current. An appropriate inductor should
then be chosen. In addition, a decision should be made
CTX15-1P
CTX15-1
CTX33-2P
CTX33-2
UP2-330
UP2-470
UP2-680
UP2-101
Sumida
CDRH6D28-150M
CDRH6D38-150M
CDRH6D28-330M
CDRH104R-330M
CDRH125-330M
CDRH104R-470M
CDRH125-470M
CDRH6D38-680M
CDRH104R-680M
CDRH125-680M
CDRH104R-101M
CDRH125-101M
Coilcraft
DT3316P-153
DT3316P-333
DT3316P-473
15
15
33
33
33
47
68
100
15
15
33
33
33
47
47
68
68
68
100
100
15
33
47
1.4
1.1
1.3
1.4
2.4
1.9
1.7
1.4
1.4
1.6
0.97
2.1
2.1
2.1
1.8
0.75
1.5
1.5
1.35
1.3
1.8
1.3
1
0.087
0.08
0.126
0.106
0.099
0.146
0.19
0.277
0.076
0.062
0.122
0.069
0.044
0.095
0.058
0.173
0.158
0.093
0.225
0.120
0.06
0.09
0.11
4.2
4.2
6
6
5.9
5.9
5.9
5.9
3
4
3
3.8
6
3.8
6
4
3.8
6
3.8
6
5
5
5
whether or not the inductor must withstand continuous
fault conditions.
1766fc
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1766IGN-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator |
| LT1767 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.4A, 500kHz Step-Down Switching Regulator |
| LT1767-1.8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 1.5A, 1.25MHz Step-Down Switching Regulators |
| LT1767-2.5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 1.5A, 1.25MHz Step-Down Switching Regulators |
| LT1767-3.3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 1.5A, 1.25MHz Step-Down Switching Regulators |
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