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参数资料
| 型号： | LT3519IMS-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | LED DRIVER WITH INTEGRATED SCHOT |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 恒定电压： | 是 |
| 拓扑： | PWM，SEPIC，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载 |
| 频率： | 800kHz ~ 1.1MHz |
| 电源电压： | 3 V ~ 30 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 16-MSOP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
LT3519/LT3519-1/LT3519-2
APPLICATIONS INFORMATION
Open LED Detection
The LT3519/LT3519-1/LT3519-2 provide an open-collector
status pin, OPENLED , that pulls low when the FB pin is
within ~60mV of its 1.22V regulated voltage. If the open
LED clamp voltage is programmed correctly using the FB
pin, then the FB pin should never exceed 1.1V when LEDs
are connected, therefore, the only way for the FB pin to
be within 60mV of the 1.22V regulation voltage is for an
open LED event to have occurred.
Inrush Current
The LT3519/LT3519-1/LT3519-2 have a built-in Schottky
diode for a boost converter. When supply voltage is ap-
plied to V IN pin, the voltage difference between V IN and
V OUT generates inrush current ?owing from input through
Board Layout
As with all switching regulators, careful attention must be
paid to the PCB board layout and component placement.
To prevent electromagnetic interference (EMI) problems,
proper layout of high frequency switching paths (see
Figure 4) is essential. Minimize the length and area of all
traces connected to the switching node pin (SW). Keep the
sense voltage pins (ISP and ISN) away from the switching
node. The bypass capacitor on the V IN supply to the LT3519
should be placed as close as possible to the V IN pin and
GND. Likewise, place C OUT next to the CATHODE pin. Do
not extensively route high impedance signals such as FB
and CTRL, as they may pick up switching noise. Figure 5
shows the recommended component placement.
the inductor and the Schottky diode to charge the output
capacitor. The selection of inductor and capacitor value
should ensure the peak of the inrush current to below
+
V IN
L1
SW
D1
V OUT
LOAD
10A. In addition, the LT3519/LT3519-1/LT3519-2 turn-on
should be delayed until the inrush current is less than the
maximum current limit. If the peak of the inrush current
is more than 10A, an external Schottky diode should be
used to bypass both the inductor and internal Schottky.
The recommended Schottky diodes for hot plug are shown
Figure 4. High Frequency Path
3519 F04
on Table 3.
Table 3. Schottky Diodes Recommended for Hot Plug
GND
OPENLED
PWM
GND
V REF
CTRL
VENDOR
PART NUMBER
V R (V)
I AVE (A)
SHDN /UVLO
FB
Diodes, Inc
Zetex
DFLS160
ZLLS10000TA
60
40
1
1
V IN ISN
SW ISP
ANODE CATHODE
R S
International Recti?er
10MQ060N
60
1.5
L1
GND
GND
C IN
C OUT
V IN
GND
V OUT
3519 F05
Figure 5. Suggested Layout
3519fa
12
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相关代理商/技术参数 |
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| LT3519IMS-2#PBF | 功能描述:IC LED DVR W/SCHOTTKY DIO 16MSOP 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 |
| LT3519IMS-2#TRPBF | 功能描述:IC LED DVR W/DIO 2.2MHZ 16MSOP 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 |
| LT3519IMSPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:LED Driver with Integrated Schottky Diode |
| LT3519IMSTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:LED Driver with Integrated Schottky Diode |
| LT3524 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Regulating Pulse Width Modulator |
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