参数资料
型号: LT1317BCS8
厂商: Linear Technology
文件页数: 10/16页
文件大小: 0K
描述: IC REG BOOST ADJ 0.5A 8SOIC
标准包装: 100
类型: 升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 1.24 V ~ 30 V
输入电压: 1.5 V ~ 12 V
PWM 型: 电流模式,混合
频率 - 开关: 600kHz
电流 - 输出: 500mA
同步整流器:
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)
包装: 管件
供应商设备封装: 8-SOIC
产品目录页面: 1327 (CN2011-ZH PDF)
LT1317/LT1317B
APPLICATIO N S I N FOR M ATIO N
FREQUENCY COMPENSATION
V IN
10 μ H
MBR0520L
V OUT
The LT1317 has an external compensation pin (V C ) which
allows the frequency response to be optimized for the
circuit configuration. In most cases, the values used in
2V
+
47 μ F
V IN
LT1317
SHDN
SW
FB
1M
+
47 μ F
3.3V
15 ?
2W
Figure 1 will work. Some circuits may need additional
compensation and a simple trial and error method for
V C
GND
604k
determining the necessary component values is given.
Figure 6 shows the test setup. A load step is applied and
C C2
100pF
R
C
50 ?
the resulting output voltage waveform is observed. Fig-
ures 7 through 10 detail the response for various values of
R and C in the compensation network. The circuit of
Figure 6. Frequency Response Test Setup
1317 F06
Figure 7 starts with a large C and small R giving a highly
overdamped system. This system will always be stable but
the output voltage displays a long settling time of >5ms.
Figure 8’s circuit has reduced C giving a shorter settling
time but still overdamped. Figure 9 shows the results
when C is reduced to the point where the system becomes
underdamped. The output voltage responds quickly
( ≈ 200 μ s to 300 μ s) but some ringing exists. Figure 10 has
V OUT
100mV/DIV
AC COUPLED
I LOAD
2mA TO
200mA
optimum R and C values giving the best possible settling
time with adequate phase margin.
An additional 100pF capacitor (C C2 ) is connected to the V C
pin and is necessary if the LT1317 is operated near current
limit. Also, C C2 should be present when higher ESR output
capacitors are used.
V OUT
100mV/DIV
AC COUPLED
I LOAD
2mA TO
200mA
V OUT
100mV/DIV
AC COUPLED
I LOAD
2mA TO
200mA
5ms/DIV
Figure 7. With C = 56nF and R = 33k,
the System is Highly Overdamped.
1ms/DIV
1317 F07
1317 F09
V OUT
100mV/DIV
AC COUPLED
I LOAD
2mA TO
200mA
5ms/DIV
Figure 8. Reducing C to 22nF
Speeds Up the Response. (R = 33k)
1ms/DIV
1317 F08
1317 F10
10
Figure 9. Using 680pF for C Results in an
Underdamped System with Ringing. (R = 33k)
Figure 10. 3.3nF and 33k Gives the
Shortest Settling Time with No Ringing.
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LT1317BCS8#PBF 功能描述:IC REG BOOST ADJ 0.5A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘,8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?(2x2) 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2
LT1317BCS8#TR 功能描述:IC REG BOOST ADJ 0.5A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压(升压) 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式,混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC(0.154",3.90mm 宽) 包装:带卷 (TR) 供应商设备封装:8-SOIC
LT1317BCS8#TRPBF 功能描述:IC REG BOOST ADJ 0.5A 8SOIC 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:2,500 系列:- 类型:升压(升压) 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式,混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC(0.154",3.90mm 宽) 包装:带卷 (TR) 供应商设备封装:8-SOIC
LT1317BIS8 功能描述:IC REG BOOST ADJ 0.5A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:1.2V,1.5V,1.8V,2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP,10-MSOP(0.118",3.00mm 宽)裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘
LT1317BIS8#PBF 功能描述:IC REG BOOST ADJ 0.5A 8SOIC 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