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参数资料
| 型号： | LT3477EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HP CONST CURR 20-QFN |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 恒定电压： | 是 |
| 拓扑： | 回扫，PWM，SEPIC，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 类型 - 次要： | 白色 LED |
| 频率： | 200kHz ~ 3.5MHz |
| 电源电压： | 2.5 V ~ 25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LT3477
TYPICAL PERFORMANCE CHARACTERISTICS
Current Sense Voltage
vs Temperature
Current Sense Voltage vs I ADJ
104
103
102
101
120
100
80
V CM = 10V
100
V CM = 10V
60
99
98
97
V CM = 42V
40
20
96
–50 –25
0
25
50
75
100
125
0
0
100 200 300 400 500 600 700 800
TEMPERATURE (°C)
3477 G14
PIN FUNCTIONS (QFN/TSSOP)
NC (Pins 1, 2, 20/Pins 18, 19, 20): No Connect Pin. Okay
to connect to ground or V IN , or to ?oat.
V IN (Pin 3/Pin 1): Input Supply. Must be locally bypassed.
Powers the internal control circuitry.
R T (Pin 4/Pin 2): Timing Resistor Pin. Adjusts the switch-
ing frequency. Connect a 17.2k resistor between R T and
GND for a 1MHz switching frequency. Do not leave this pin
open. See Table 4 for additional R T values and switching
frequencies.
SHDN (Pin 5/Pin 3): Shutdown. Tie to 2V or greater to
enable the device. Tie below 0.3V to turn off the device.
SS (Pin 6/Pin 4): Soft-Start. Place a soft-start capacitor
here. Leave ?oating if not in use.
V C (Pin 7/Pin 5): Compensation Pin for Error Ampli?er.
Connect a series RC from this pin to GND. Typical values
are 1k Ω and 4.7nF.
FBN (Pin 8/Pin 6): The Inverting Input to the Error Ampli-
?er. Connect resistive divider tap here for positive output
voltage.
I ADJ VOLTAGE (mV)
2477 G13
FBP (Pin 9/Pin 7): The Noninverting Input to the Error
Ampli?er. Connect resistive divider tap here for negative
output voltage.
V REF (Pin 10/Pin 8): Bandgap Voltage Reference. Inter-
nally set to 1.235V. Connect this pin to FBP if generat-
ing a positive output or to an external resistor divider if
generating a negative voltage. This pin can provide up
to 100μA of current and can be locally bypassed with a
100pF capacitor.
I ADJ2 (Pin 11/Pin 9): Second Current Sense Adjustment.
Setting I ADJ2 to be less than 625mV leads to adjustment of
the sensed voltage of the second current sense ampli?er
linearly. If I ADJ2 is tied to higher than 650mV, the default
current sense voltage is 100mV. If current sense ampli?er 2
is not used, always tie I ADJ2 to higher than 650mV.
I ADJ1 (Pin 12/Pin 10): First Current Sense Adjustment.
Setting I ADJ1 to be less than 625mV leads to adjustment
of the sensed voltage of the ?rst current sense ampli?er
linearly. If I ADJ1 is tied to higher than 650mV, the default
current sense voltage is 100mV. If current sense ampli?er 1
is not used, always tie I ADJ1 to higher than 650mV.
3477fc
5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3477IFE | 制造商:LINER 制造商全称:Linear Technology 功能描述:3A, DC/DC Converter with Dual Rail-to-Rail Current Sense |
| LT3477IFE#PBF | 功能描述:IC LED DRVR HP CONS CURR 20TSSOP 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 |
| LT3477IFE#TRPBF | 功能描述:IC LED DRVR HP CONS CURR 20TSSOP 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 |
| LT3477IUF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3A, DC/DC Converter with Dual Rail-to-Rail Current Sense |
| LT3477IUF#PBF | 功能描述:IC LED DRVR HP CONST CURR 20-QFN 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 |
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