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| 型号： | LT1302CS8-5#TR |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST 5V 0.6A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 2 V ~ 8 V |
| PWM 型： | 电流模式，混合 |
| 电流 - 输出： | 600mA |
| 同步整流器： | 无 |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LT1302/LT1302-5
APPLICATIO N S I N FOR M ATIO N
Frequency Compensation
Obtaining proper RC values for the frequency compensa-
tion network is largely an empirical procedure, since
variations in input and output voltage, topology, capacitor
ESR and inductance make a simple formula elusive. As an
example, consider the case of a 2.5V to 5V boost converter
supplying 500mA. To determine optimum compensation,
the circuit is built and a transient load is applied to the
circuit. Figure 7 shows the setup.
In Figure 7a, the V C pin is simply left floating. Although
output voltage is maintained and transient response is
good, switch current rises instantaneously to the internal
current limit upon application of load. This is an undesir-
able situation as it places maximum stress on the switch
and the other power components. Additionally, efficiency
is well down from its optimal value. Next, a 0.1 μ F capacitor
is connected with no resistor. Figure 7b details response.
Although the circuit eventually stabilizes, the loop is quite
underdamped. Initial output “sag” exceeds 5%. Aberrant
V IN
behavior in the 4th graticule is the result of the LT1302’s
Burst Mode comparator turning off all switching as output
voltage rises above its threshold.
In Figure 7c, the 0.1 μ F capacitor has been replaced by a
0.01 μ F unit. Undershoot is less but the response is still
underdamped. Figure 7d shows the results of the 0.1 μ F
capacitor and a 10k resistor in series. Now some amount
of damping is observed, and behavior is more controlled.
Figure 7e details response with a 0.01 μ F/10k series net-
work. Undershoot is down to around 100mV, or 2%. A
slight underdamping is still noticeable.
Finally, a 0.01 μ F/24k series network results in the re-
sponse shown in Figure 7f. This has optimal damping,
undershoot less than 100mV and settles in less than 1ms.
The V C pin is sensitive to high frequency noise. Some
layouts may inject enough noise to modulate peak switch
current at 1/2 the switching frequency. A small capacitor
connected from V C to ground will eliminate this. Do not
exceed 1/10 of the compensation capacitor value.
2.5V
+
C1
330 μ F
L1
10 μ H
D1
0.1 μ F
NC
V IN I T
SW SHDN
LT1302-5
PGND
SENSE
+
C2
220 μ F
+
C3
220 μ F
GND
V C
R
500 ?
10 ?
2W
PULSE
C
MTP3055EL
50 ?
GENERATOR
C1, C2, C3 = AVX TPS SERIES
V OUT
D1 = MOTOROLA MBRS130LT3
L1 = COILCRAFT DO3316-103K
Figure 7. Boost Converter with Simulated Load
1302 F07
100mV/DIV
AC COUPLED
V OUT
100mV/DIV
AC COUPLED
I LOAD
510mA
10mA
I LOAD
510mA
10mA
2ms/DIV
1302 F07a
2ms/DIV
1302 F07b
Figure 7a. V C Pin Left Unconnected. Output Shows
Low Frequency Components Under Load
Figure 7b. 0.1 μ F from V C to Ground.
Better, but More Improvement Needed
9
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相关代理商/技术参数 |
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| LT1302CS8PBF | 制造商:Linear Technology 功能描述:Step up dc-dc converter,LT1302CS8 5V 2A |
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| LT1303CN8 | 功能描述:IC REG BOOST ADJ 0.2A 8DIP 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 |
| LT1303CN8#PBF | 功能描述:IC REG BOOST ADJ 0.2A 8DIP 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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