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参数资料
| 型号： | LTC3214EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 10-DFN |
| 标准包装： | 2,500 |
| 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： | 闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 600kHz ~ 1.2MHz |
| 电源电压： | 2.9 V ~ 4.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LTC3214
OPERATION
R OL is dependent on a number of factors including the
oscillator frequency, ?ying capacitor values and switch
resistances. From Figure 1, we can see that the output
current is proportional to:
For applications requiring multiple current levels, several
schemes may be used to change the resistance for the
R SET resistor. Figure 2 shows one such scheme. The cir-
cuit in Figure 2 uses the I/O output of a microcontroller
1.5V IN – CPO
R OL
OR
2V IN – CPO
R OL
to switch a second resistor (R2) in parallel or series with
R1, changing the effective I SET current.
in the 1.5x mode or 2x mode respectively.
LED Current Programming
The LTC3214 includes an accurate, programmable cur-
rent source that is capable of driving LED currents up to
300mA continuously and up to 500mA for pulsed opera-
tion. Pulsed operation may be achieved by toggling the
EN pin. In either continuous or pulsed operation, proper
board layout is required for effective heat sinking.
The current may be programmed using a single external
resistor. Equation 1, used to calculate the resistor value
from the desired current level is repeated below:
R SET = 3570/I LED
Mode Switching
The LTC3214 will automatically switch from 1x mode
to 1.5x mode, and subsequently from 1.5x mode to 2x
mode whenever the LED forward voltage approaches the
maximum CPO voltage for that mode. The part will wait
approximately 2.5ms before switching to the next mode.
This delay allows the LED to warm up and reduce its for-
ward voltage which may remove the dropout condition.
The part may be reset to 1x mode by bringing the part
into shutdown by setting the EN pin low. Once the EN pin
is low, it may be immediately brought high to re-enable
the part.
2.2μF
2.2μF
C1 +
C1 – C2 +
C2 –
2.9V TO 4.5V
V IN
CPO
μP
V IO
2.2μF
LTC3214
I LED
I LED *
4.7μF
ON/OFF
EN
V IO
R2
I SET
TORCH/FLASH
R1
3214 F02
*I TORCH = [(1.21V/R1) – ((V IO – 1.21V)/R2)] ? 2950
I FLASH = [(1.21V/(R1 ? R2/(R1 + R2))] ? 2950
Figure 2. Recommended Circuit for Attaining Two Current Levels (Torch and Flash Modes)
3214fb
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3215 | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Low Noise High Current LED Charge Pump |
| LTC3215EDD | 功能描述:IC LED DRIVR WHITE BCKLGT 10-DFN RoHS:否 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 |
| LTC3215EDD#PBF | 功能描述:IC LED DRIVR WHITE BCKLGT 10-DFN 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 |
| LTC3215EDD#TR | 功能描述:IC LED DRIVR WHITE BCKLGT 10-DFN RoHS:否 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 |
| LTC3215EDD#TRPBF | 功能描述:IC LED DRIVR WHITE BCKLGT 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 |
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