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| 型号： | LT3479EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV ADJ 3A 16TSSOP |
| 标准包装： | 95 |
| 类型： | 升压（升压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.24 V ~ 42 V |
| 输入电压： | 2.5 V ~ 24 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 3.5MHz |
| 电流 - 输出： | 3A |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
LT3479
OPERATION
The LT3479 uses a ?xed frequency, current mode control
scheme to provide excellent line and load regulation. Op-
eration can be best understood by referring to the Block
Diagram. The start of each oscillator cycle sets the SR latch
and turns on power switch Q1. The signal at the inverting
input of the PWM comparator (SLOPE) is proportional to
the sum of the switch current and oscillator ramp. When
SLOPE exceeds V C (the output of the feedback ampli?er),
the PWM comparator resets the latch and turns off the
power switch. In this manner, the feedback ampli?er and
PWM comparators set the correct peak current level to
keep the output in regulation.
The LT3479 also features a soft-start function. During
start-up, 10μA of current charges the external soft-start
capacitor. The SS pin directly limits the rate of voltage rise
on the V C pin, which in turn limits the peak switch cur-
rent. The switch current is constantly monitored and not
allowed to exceed the nominal value of 3A. If the switch
current reaches 3A, the SR latch is reset regardless of the
output of the PWM comparator. Current limit protects the
power switch and external components.
Soft-start plays an important role in applications where the
switch will reach levels of 30V or higher. During startup,
an overshoot in the switch current together with the pres-
ence of high switch voltage can overstress the switch. A
properly used soft-start feature will greatly improve the
robustness of such designs.
In addition to soft-start, inrush current protection protects
the LT3479 against shorts and line transients. During such
faults, the inductor current can momentarily exceed 3A and
damage the switch. Through an internal 8.5mΩ resistor
placed in series with the inductor, the inrush current protec-
tion comparator measures the inductor current. If it exceeds
5A, a soft-start cycle is initiated. The LT3479 will remain in
the soft-start condition until the fault has passed.
3479fc
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3479EFE-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection |
| LT3480 | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 2A, 2.4MHz Step-Down Switching Regulator with 70μA Quiescent Current |
| LT3480EDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:36V, 2A, 2.4MHz Step-Down Switching Regulator with 70μA Quiescent Current |
| LT3480EDD#PBF | 功能描述:IC REG BUCK ADJ 2A 10DFN 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 |
| LT3480EDD#PBF | 制造商:Linear Technology 功能描述:Switching Regulator IC 制造商:Linear Technology 功能描述:IC, BUCK REGULATOR, DFN-10 |
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