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参数资料
| 型号： | LTC3218EDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR FLASH TORCH 10DFN |
| 标准包装： | 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： | 1MHz |
| 电源电压： | 2.9 V ~ 4.5 V |
| 输出电压： | 5.3V |
| 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-EP（3x2） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LTC3218
APPLICATIONS INFORMATION
η ≡ LED
η ≡ LED = LED
≈ LED
Thefollowingguidelinesshouldbefollowedwhendesign-
ing a PCB layout for the LTC3218.
? The Exposed Pad should be soldered to a large copper
plane that is connected to a solid, low impedance ground
plane using plated, through-hole vias for proper heat
sinking and noise protection.
? Input and output capacitors (C IN and C CPO ) must also
be placed as close to the part as possible.
? The ?ying capacitor must also be placed as close to
the part as possible. The traces running from the pins
to the capacitor pads should be as wide as possible.
? V IN , CPO and I LED traces must be made as wide as pos-
sible. This is necessary to minimize inductance, as well
as provide suf?cient area for high current applications.
? LED pads must be large and should be connected to
as much solid metal as possible to ensure proper heat
sinking.
Power Ef?ciency
To calculate the power ef?ciency ( η ) of a white LED
driver chip, the LED power should be compared to the
input power. The difference between these two numbers
represents lost power whether it is in the charge pump
or the sense resistor. Stated mathematically, the power
ef?ciency is given by:
P
P IN
The ef?ciency of the LTC3218 depends on the mode in
which it is operating. In 1x mode, the LTC3218 regulates
the output down to the LED forward voltage required to
achieve the desired current by varying the strength of the
series switches. This mode provides the optimum ef?ciency
available for a given input voltage and LED forward voltage.
The ef?ciency is approximated by:
P V ? I LED V
P IN V IN ? I IN V IN
since the input current will be very close to the LED current.
C FLY
C CPO
PIN 1
C IN
R SETT
R SETF
3218 F03
Figure 3. Example Board Layout
3218fb
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3218EDDBTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:400mA Single Wire Camera LED Charge Pump |
| LTC3219 | 制造商:LINER 制造商全称:Linear Technology 功能描述:250mA Universal Nine Channel LED Driver |
| LTC3219EUD#PBF | 功能描述:IC LED DRIVR QVGA DISPLAY 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 |
| LTC3219EUD#TRPBF | 功能描述:IC LED DRIVR QVGA DISPLAY 20-QFN 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 |
| LTC3219EUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:250mA Universal Nine Channel LED Driver |
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