- 您现在的位置：买卖IC网 > PDF目录13074 > LTC1530CS8#TR (Linear Technology)IC SW REG CTRLR SYNC HIPWR 8SOIC PDF资料下载
参数资料
| 型号： | LTC1530CS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC SW REG CTRLR SYNC HIPWR 8SOIC |
| 标准包装： | 2,500 |
| 应用： | 控制器，Intel Pentium? II，AMD-K6?-2 |
| 输入电压： | 3.75 V ~ 13.2 V |
| 输出数： | 1 |
| 输出电压： | 1.3 V ~ 3.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
LTC1530
APPLICATIO S I FOR ATIO
Figure 5b plots the minimum required R IMAX resistor (k ? )
versus the maximum operating load current (I LMAX =
I LOAD + I RIPPLE /2) as a function of Q1’s R DS(ON) . Note that
during an intial power-up sequence (V OUT = 0V), the
inductor’s start-up current I ST is much higher than the
5500
4500
3500
R IMAX ≥ 500 ?
I LMAX = I LOAD + I RIPPLE /2
Q1 R DS(ON) = 0.05 ?
0 .0 4 ?
0.03 ?
steady-state condition, I LMAX . The difference between I ST
and I LMAX is affected by the input power supply slew rate,
2500
0.02 ?
the input and output voltages, the LTC1530 soft-start slew
rate, the maximum duty cycle and the inductor and output
1500
0.01 ?
capacitor values.
500
0
2
4
6
8 10 12 14 16 18 20
For a given application, the input and output requirements
are known and determine the main inductor and output
capacitor values. These values establish the transient load
recovery time. In general, a low value inductor combined
with high value output capacitance has a short transient
I LMAX (A)
1530 F05b
Figure 5b. Minimum Required R IMAX vs I LMAX
25
load recovery time at the expense of higher inductor ripple
and start-up current (I RIPPLE and I ST ). However, if a small
inductor and large value output capacitors are chosen, the
value of R IMAX obtained from Figure 5b may be too small
to allow proper regulator start-up.
During start-up, if I ST is higher than the current limit
threshold set by the R IMAX resistor, the LTC1530 current
limit comparator turns on. This comparator then limits
input charging current by reducing duty cycle. During this
20
15
10
5
0
T A = 25 ° C
V IN = 5V
I LOAD = 0A
L = 1.2 μ H
L = 4.7 μ H
L = 2.4 μ H
time, if V OUT doesn’t increase above one-half of the rated
value, the LTC1530 hard current limit circuit turns on. This
0
2
4 6 8
OUTPUT CAPACITANCE (mF)
10
12
1530 F06a
circuit forces the LTC1530 to repeat a soft-start cycle and
the power supply fails to start. If V OUT increases above
one-half of the rated value, the power supply output may
Figure 6a. Start-Up I ST vs Output Capacitance
start-up properly depending on whether the limited input
current charges the output capacitor and prevents hard
current limit action.
Therefore, select R IMAX with the start-up current (I ST ) in
mind. Choosing R IMAX to set the current comparator
threshold above I ST ensures proper power supply start-up
as well as recovery from an output fault condition.
Figures 6a and 6b plot the start-up I ST vs output capaci-
30
25
20
15
10
5
T A = 25 ° C
V IN = 5V
I LOAD = 10A
L = 2.4 μ H
L = 1.2 μ H
L = 4.7 μ H
tance and inductance for unloaded and loaded conditions
with the current limit circuit disabled. Figures 6a and 6b
0
0
2
4 6 8
10
12
are provided as examples. Actual I ST under start-up con-
ditions must be measured for any application circuit so
OUTPUT CAPACITANCE (mF)
1530 F06b
that R IMAX can be properly chosen.
Figure 6b. Start-Up I ST vs Output Capacitance
1530fa
10
相关PDF资料 |
PDF描述 |
|---|---|
| C0603X7R1C472K | CAP CER 4700PF 16V 10% X7R 0201 |
| VI-J5J-EZ-B1 | CONVERTER MOD DC/DC 36V 25W |
| LTC1430CN8 | IC SW REG CNTRLR STEP-DWN 8-DIP |
| ESC12DRTN-S734 | CONN EDGECARD 24POS DIP .100 SLD |
| MIC9131YQS | IC CTRLR DC-DC PWM HV HS 16-QSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1530IS8 | 功能描述:IC SW REG CNTRLR SYNC ADJ 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1530IS8#PBF | 功能描述:IC SW REG CNTRLR SYNC ADJ 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1530IS8#TR | 功能描述:IC SW REG CTRLR SYNC HIPWR 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1530IS8#TRPBF | 功能描述:IC SW REG CNTRLR SYNC ADJ 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1530IS8-1.9 | 功能描述:IC SW REG CNTRLR SYNC 1.9V 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
发布紧急采购，3分钟左右您将得到回复。