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参数资料
| 型号： | LT3495EDDB#TRMPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.78 A SWITCHING REGULATOR, PDSO10 |
| 封装： | 3 X 2 MM, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-10 |
| 文件页数： | 15/16页 |
| 文件大小： | 299K |
| 代理商： | LT3495EDDB#TRMPBF |
LT3495/LT3495B/
LT3495-1/LT3495B-1
8
3495b1b1fa
OPERATION
The LT3495 series utilizes a variable peak current, variable
off-time control scheme to provide high efciency over a
wide range of output current.
The operation of the part can be better understood by
referring to the Block Diagram. The part senses the output
voltage by monitoring the voltage on the FB pin. The user
sets the desired output voltage by choosing the value of
the external top feedback resistor. The parts incorporate
a precision 76k bottom feedback resistor. Assuming that
output voltage adjustment is not used (CTRL pin is tied to
1.5V or greater), the internal reference (VREF = 1.235V) sets
the voltage at which FB will servo to during regulation.
The Switch Control block senses the output of the ampli-
er and adjusts the switching frequency as well as other
parameters to achieve regulation. During the start-up of
the circuit, special precautions are taken to ensure that
the inductor current remains under control.
For the LT3495/LT3495-1, the switching frequency is never
allowed to fall below approximately 45kHz. Because of this,
a minimum load must be present to prevent the output
voltage from drifting too high. For most applications, this
minimum load is automatically generated within the part
via the Shunt Control block. The level of this current is
adaptable, removing itself when not needed to improve
efciency at higher load levels. However when the input
Table 1. Difference Between LT3495 and LT3495B/LT3495-1/LT3495B-1
PART
SWITCH CURRENT LIMIT (mA)
MINIMUM SWITCHING FREQUENCY (kHz)
MINIMUM OUTPUT LOAD REQUIREMENT
LT3495
650
45
Required under certain conditions
LT3495B
650
0
Not Required
LT3495-1
350
45
Required under certain conditions
LT3495B-1
350
0
Not Required
voltage and output voltage are close, the internal shunt
current may not be large enough. Under this condition,
a minimum output load is required to prevent the output
voltage from drifting too high.
For the LT3495B/B-1, the minimum switching frequency
feature is disabled and the switching frequency can be as
low as zero. As a result, the output voltage will never drift
high and no minimum output load is required.
The LT3495 series also has a PMOS output disconnect
switch. The PMOS switch is turned on when the part is
enabled via the SHDN pin. When the parts are in shutdown,
the PMOS switch turns off, allowing the VOUT node to go to
ground. This type of disconnect function is often required
in power supplies.
The LT3495 series also sets a maximum switch on time of
10μs. This feature guarantees that the parts can continue
to deliver energy to the output even if the input supply
impedance becomes so large that the commanded peak
switch current is never reached.
The difference between the LT3495/LT3495B and LT3495-1/
LT3495B-1 is the level of the current limit. LT3495/LT3495B
have a typical peak current limit of 650mA while the
LT3495-1/LT3495B-1 have a typical peak current limit of
350mA. The differences between the LT3495 and LT3495B/
LT3495-1/LT3495B-1 are listed in Table 1.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3495EDDB-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect |
| LT3496 | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Channel 50mA LED |
| LT3496EFE#PBF | 功能描述:IC LED DRVR WT/RGB BCKLT 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| LT3496EFE#TRPBF | 功能描述:IC LED DRVR WT/RGB BCKLT 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT3496EFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Triple Output LED Driver |
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