参数资料
| 型号： | LT3431IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 16TSSOP |
| 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 ~ 48 V |
| 输入电压： | 5.5 V ~ 60 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 3A |
| 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-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-TSSOP-EP |
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LT3431
APPLICATIO S I FOR ATIO
LT3431
TO FREQUENCY
SHIFTING
V SW
L1
OUTPUT
5V
ERROR
1.4V
Q1
AMPLIFIER
+
1.2V
R1
–
R3
1k
R4
2k
FB
+
C1
BUFFER
Q2
TO SYNC CIRCUIT
R2
V C
GND
3431 F02
Figure 2. Frequency and Current Limit Foldback
will increase and the protection accorded by frequency
and current foldback will decrease.
V OUT USING
47 μ F CERAMIC
OUTPUT
CAPACITOR
CHOOSING THE INDUCTOR
For most applications, the output inductor will fall into the
range of 5 μ H to 33 μ H. Lower values are chosen to reduce
physical size of the inductor. Higher values allow more
output current because they reduce peak current seen by
the LT3431 switch, which has a 3A limit. Higher values
also reduce output ripple voltage.
10mV/DIV
V IN = 12V
1 μ s/DIV
3431 F03
V OUT USING
100 μ F, 0.08 ?
TANTALUM
OUTPUT
CAPACITOR
When choosing an inductor you will need to consider
output ripple voltage, maximum load current, peak induc-
tor current and fault current in the inductor. In addition,
other factors such as core and copper losses, allowable
component height, EMI, saturation and cost should also
be considered. The following procedure is suggested as a
way of handling these somewhat complicated and con-
flicting requirements.
V OUT = 5V
L = 10 μ H
Figure 3. LT3431 Output Ripple Voltage Waveforms.
Ceramic vs Tantalum Output Capacitors
Output ripple voltage is determined by ripple current
(I LP-P ) through the inductor and the high frequency
impedance of the output capacitor. At high frequencies,
the impedance of the tantalum capacitor is dominated by
its effective series resistance (ESR).
Output Ripple Voltage
Figure 3 shows a comparison of output ripple voltage for
the LT3431 using either a tantalum or ceramic output
capacitor. It can be seen from Figure 3 that output ripple
voltage can be significantly reduced by using the ceramic
output capacitor; the significant decrease in output ripple
voltage is due to the very low ESR of ceramic capacitors.
Tantalum Output Capacitor
The typical method for reducing output ripple voltage
when using a tantalum output capacitor is to increase the
inductor value (to reduce the ripple current in the induc-
tor). The following equations will help in choosing the
required inductor value to achieve a desirable output
ripple voltage level. If output ripple voltage is of less
sn3431 3431fs
9
相关PDF资料 |
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| LT3433IFE#TRPBF | IC REG BUCK BST ADJ 0.5A 16TSSOP |
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| LT3433 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Step-Up/Step-Down DC/DC Converter |
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| LT3433EFE | 功能描述:IC REG BUCK BST ADJ 0.5A 16TSSOP 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 |
| LT3433EFE#PBF | 功能描述:IC REG BUCK BST ADJ 0.5A 16TSSOP 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 |
| LT3433EFE#TR | 功能描述:IC REG BUCK BST ADJ 0.5A 16TSSOP 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 |
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