- 您现在的位置：买卖IC网 > PDF目录20897 > LT3591EDDB#TRPBF (Linear Technology)IC LED DRIVER WHITE BCKLGT 8-DFN PDF资料下载
参数资料
| 型号： | LT3591EDDB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER WHITE BCKLGT 8-DFN |
| 标准包装： | 2,500 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 750kHz ~ 1.2MHz |
| 电源电压： | 2.5 V ~ 12 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（3x2） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LT3591
APPLICATIONS INFORMATION
? α π ?
I PK = IN
? ω 2 ?
? exp ? – ? ?
SCHOTTKY DIODE
The LT3591 has a built-in Schottky diode. The internal
schottky saves board space in space constrained appli-
cations. In less space sensitive applications, an external
schottky diode connected between the SW node and the
For low DCR inductors, which is usually the case for this
application, the peak inrush current can be simpli?ed as
follows:
V – 0 . 6
L ? ω
CAP node increases ef?ciency one to two percent. It is
important to use a properly rated schottky diode that can
handle the peak switch current of the LT3591. In addition,
α =
r
2 ? L
the schottky diode must have a breakdown voltage of at least
40V along with a low forward voltage in order to achieve
higher ef?ciency. One recommended external schottky
ω =
1
L ? C
–
r 2
4 ? L 2
diode for the LT3591 is the Phillips PMEG4005AEA.
OVERVOLTAGE PROTECTION
The LT3591 has an internal open-circuit protection circuit.
In the cases of output open circuit, when the LEDs are
disconnected from the circuit or the LEDs fail open circuit,
V CAP is clamped at 42V (typ). The LT3591 will then switch
at a very low frequency to minimize input current. The V CAP
and input current during output open circuit are shown in
where L is the inductance, r is the DCR of the inductor
and C is the output capacitance.
Table 3 gives inrush peak currents for some component
selections.
Table 3. Inrush Peak Currents
V IN (V) r ( Ω ) L ( μ H) C OUT ( μ F) I P (A)
4.2 0.3 22 2.2 1.06
4.2 0.71 22 2.2 0.96
the Typical Performance Characteristics. Figure 4 shows
the transient response when the LEDs are disconnected.
4.2
4.2
0.58
1.6
15
15
1
1
0.83
0.68
I L
500mA/DIV
V CAP
20V/DIV
PROGRAMMING LED CURRENT
The feedback resistor (R SENSE ) and the sense voltage
(V CAP – V LED ) control the LED current.
The CTRL pin controls the sense reference voltage as
shown in the Typical Performance Characteristics. For
V IN = 3.6V
CIRCUIT OF
FRONT PAGE
APPLICATION
500 μ s/DIV
LEDs DISCONNECTED
AT THIS INSTANT
3591 F04
CTRL higher than 1.5V, the sense reference is 200mV,
which results in full LED current. In order to have accurate
LED current, precision resistors are preferred (1% is rec-
ommended). The formula and table for R SENSE selection
Figure 4. Output Open-Circuit Waveform
are shown below.
INRUSH CURRENT
The LT3591 has a built-in Schottky diode. When supply
R SENSE =
200mV
I LED
voltage is applied to the V IN pin, an inrush current ?ows
through the inductor and the Schottky diode and charges
up the CAP voltage. The Schottky diode inside the LT3591
can sustain a maximum current of 1A.
3591f
8
相关PDF资料 |
PDF描述 |
|---|---|
| MTU1D0505MC | DC/DC CONVERT +/-5V 100MA 1W SMD |
| MTU1S0305MC | DC/DC CONVERTER 5V 200MA 1W SMD |
| P51-50-A-Z-M12-20MA-000-000 | SENSOR 50PSI 1/4-18NPT 4-20MA |
| 4920-WHITE-1/2"X72YD-PK | TAPE VHB ACRYLIC FOAM 1/2"X 72YD |
| MTU1D1212MC | DC/DC CONVERT +/-12V 42MA 1W SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3592 | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA Wide Input Voltage Range Step-Down LED Driver with 10:1 Dimming |
| LT3592EDDB | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA Wide Input Voltage Range Step-Down LED Driver with 10:1 Dimming |
| LT3592EDDB#PBF | 制造商:Linear Technology 功能描述:IC LED DRIVER BUCK DFN-10 制造商:Linear Technology 功能描述:IC, LED DRIVER, BUCK, DFN-10; Topology:Buck (Step Down); No. of Outputs:1; Output Current:500mA; Output Voltage:30V; Driver Case Style:DFN; Input Voltage Min:3.6V; Input Voltage Max:36V; Dimming Control Type:PWM; Device Type:LED ;RoHS Compliant: Yes |
| LT3592EDDB#TRMPBF | 功能描述:IC LED DRVR HP CONST CURR 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| LT3592EDDB#TRPBF | 功能描述:IC LED DRVR HP CONST CURR 10-DFN 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 |
发布紧急采购，3分钟左右您将得到回复。