- 您现在的位置：买卖IC网 > PDF目录20877 > LTC3205EUF (Linear Technology)IC LED DRVR WT/RGB BCKLGT 24-QFN PDF资料下载
参数资料
| 型号： | LTC3205EUF |
| 厂商： | Linear Technology |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WT/RGB BCKLGT 24-QFN |
| 标准包装： | 91 |
| 拓扑： | PWM，降压（降压），升压（升压），切换式电容器（充电泵） |
| 输出数： | 9 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 600kHz ~ 1.1MHz |
| 电源电压： | 2.8 V ~ 4.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
LTC3205
APPLICATIO S I FOR ATIO
If the desired input voltage range is below the data shown
in Figure 9, and a precise control of the LED current is
desired, then a precision current source may be added to
either the I MS or I RGB pins as shown in Figure 10.
Thermal Management
For higher input voltages and maximum output current,
there can be substantial power dissipation in the LTC3205.
If the junction temperature increases above approximately
160 ° C the thermal shutdown circuitry will automatically
1.8V
LTC3205
I MS
I RGB
14
13
deactivate the output. To reduce the maximum junction
temperature, a good thermal connection to the PC board
is recommended. Connecting the PGND pin (exposed
80k
+
24.3k
center pad) to a ground plane and maintaining a solid
ground plane under the device can reduce the thermal
resistance of the package and PC board considerably.
(
I LED = 400 1.223V – CNTRL
14
10k
–
800 ?
LTC3205
I MS
R2
V
R1 || R2 R2
)
V CNTRL
3205 F10
Figure 10. Precision Reference Current
I RGB
13
24.9k
R1
3205 F11
Brightness Control
Although the LTC3205 has three exponentially spaced
brightness settings for the main and sub displays, it is
possible to control the brightness by alternative means.
Figure 11. Alternative Linear Brightness Control
Figure 11 shows an example of how an external voltage
source can be use to inject a current into the I MS or I RGB
pins to control brightness. For example, if R1 and R2 are
LTC3205
I MS
I RGB
14
13
71.5k
38.3k
V DIG
0V TO 1.3V
OR HIGHER
50k, then the LED current would range from 20mA to 0mA
as V CNTRL is swept from 0V to 2.5V.
Alternatively, if only digital outputs are available, the
number of settings can be doubled from 3 to 6 by simply
connecting V CNTRL to a digital signal. With a 1.8V logic
24.9k
3205 F12
Figure 12. Alternative Digital Brightness Control
supply, the circuit shown in Figure 12 has LED current
settings of 2.5mA, 5mA, 7.5mA, 10mA, 15mA and 20mA.
This topology can be extended to any number of bits and
can also be applied to the RGB panel.
LTC3205
I MS
I RGB
14 24.9k
13 24.9k
PWM SIGNAL
0V TO 1.3V OR HIGHER
BRIGHTNESS = 1 – D
3205 F13
Finally, PWM brightness control can be achieved by
applying a PWM signal to the I MS programming resistor as
Figure 13. PWM Brightness Control of the MAIN and SUB Displays
shown in Figure 13. The signal should range from 0V (full
on) to any voltage above 1.3V (full off).
3205f
13
相关PDF资料 |
PDF描述 |
|---|---|
| P51-75-S-AA-I36-20MA-000-000 | SENSOR 75PSIS 7/16 UNF 4-20 MA |
| P51-15-S-Z-I36-20MA-000-000 | SENSOR 15PSIS 1/4 NPT 4-20 MA |
| P51-3000-A-H-M12-4.5OVP-000-000 | SENSOR 3000PSI M12-1.5 6G 4.5V |
| REC3-1205DRW/H4/A/SMD/CTRL-R | CONV DC/DC 3W 9-18VIN +/-05VOUT |
| REC5-2405DRWZ/H/B/M/SMD | CONV DC/DC 5W 9-36VIN +/-05VOUT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3205EUF#PBF | 功能描述:IC LED DRVR WT/RGB BCKLGT 24-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 |
| LTC3205EUF#TR | 功能描述:IC LED DRVR WT/RGB BCKLGT 24-QFN 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 |
| LTC3205EUF#TRPBF | 功能描述:IC LED DRVR WT/RGB BCKLGT 24-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 |
| LTC3205EUFPBF | 制造商:Linear Technology 功能描述:Multidisplay LED Controller,LTC3205 |
| LTC3205XEUF#PBF | 功能描述:IC LED DRVR WT/RGB BCKLGT 24-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 |
发布紧急采购，3分钟左右您将得到回复。