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| 型号： | LT1317BIS8 |
| 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： | 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： | 管件 |
| 供应商设备封装： | 8-SOIC |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LT1317BIS8#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BOOST 600KHZ 800mA S 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BOOST, 600KHZ, 800mA, S |
| LT1317BIS8#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: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#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: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 |
| LT1317CMS8 | 功能描述:IC REG BOOST ADJ 0.5A 8MSOP 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 |
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