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参数资料
| 型号： | LT3517EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER AUTOMOTIVE 16-QFN |
| 标准包装： | 2,500 |
| 系列： | True Color PWM™ |
| 恒定电流： | 是 |
| 恒定电压： | 是 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 250kHz ~ 2.5MHz |
| 电源电压： | 3 V ~ 30 V |
| 输出电压： | 7V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
LT3517
APPLICATIONS INFORMATION
I LED =
than1V,theLEDcurrentis:
V CTRL
10 ? R SENSE
(2)
For a buck or a buck-boost configuration, the output
voltage is typically level-shifted to a signal with respect
to GND, as illustrated in the Figure 4. The output can be
expressed as:
When V CTRL is higher than 1V, the LED current is clamped
to be:
V OUT =
R1
R2
? 1.01V + V BE(Q1)
(5)
I LED =
100mV
R SENSE
(3)
The LED current programming feature possibly increases
total dimming range by a factor of ten.
The CTRL pin should not be left open (tie to V REF if not
used). The CTRL pin can also be used in conjunction with
a PTC thermistor to provide overtemperature protection
for the LED load.
LT3517
FB
Q2
+
R1
V OUT
–
R2
3517 F04
Figure 4
R SENSE
LED
ARRAY
V REF
45.3k
5k
PTC
2V
49.9k
CTRL
3517 F02
Inductor Selection
The inductor used with the LT3517 should have a satura-
tion current rating of 2A or greater. For buck mode LED
drivers, the inductor value should be chosen to give a
ripple current “ΔI” of ~30% to 40% of the LED current.
In the buck mode, the inductor value can be estimated
using the formula:
V OUT = ?
+ 1 ? ? 1.01V
? R1 ?
? R2
?
L ( ) =
D BUCK ? t SW (μs) ? ( V IN – V LED )
D BUCK =
Figure2
Setting Output Voltage
For a boost application, the output voltage can be set by
selecting the values of R1 and R2 (see Figure 3) according
to the following equation:
(4)
μH (6)
ΔI
V LED
V IN
V LED is the voltage across the LED string, V IN is the input
voltage to the converter, and t SW is the switching period.
In the boost configuration, the inductor can be estimated
using the formula:
L ( μH ) =
D BOOST =
LT3517
FB
V OUT
R1
R2
D BOOST ? t SW (μs) ? V IN
ΔI
V LED – V IN
V LED
(7)
3517 F03
Figure 3
3517fg
For more information www.linear.com/LT3517
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3517HFE#PBF | 功能描述:IC LED DRIVR AUTOMOTIVE 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:True Color PWM™ 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 |
| LT3517HFE#TRPBF | 功能描述:IC LED DRIVR AUTOMOTIVE 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:True Color PWM™ 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 |
| LT3517HFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Full-Featured LED Driver with 1.5A Switch Current |
| LT3517HFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Full-Featured LED Driver with 1.5A Switch Current |
| LT3517HUF#PBF | 功能描述:IC LED DRIVER AUTOMOTIVE 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:True Color PWM™ 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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