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| 型号： | LM2795TLX/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 15/23页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHT BCKLT 14USMD |
| 标准包装： | 3,000 |
| 恒定电流： | 是 |
| 拓扑： | PWM，切换式电容器（充电泵） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 325kHz ~ 515kHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFBGA |
| 供应商设备封装： | 14-TuSMD |
| 包装： | 带卷 (TR) |
| 工作温度： | -30°C ~ 85°C |
| 配用： | LM2795EVAL-ND - BOARD EVALUATION LM2795 |
| 其它名称： | LM2795TLX |
C 1
1 … F
C 2
1 … F
SNVS168L – JANUARY 2002 – REVISED MAY 2013
3.0V
V IN
C 1 -
C 1 + C 2 -
C 2 +
P OUT
C IN
1 … F
BRGT
LM2794/95
GND
C POUT
1 … F
R SET
124 :
D 1
D 2 D 3
D 4
15mA
30mA
Figure 25. Two Parallel Connected LEDs
With this configuration, two parallel current sources of equal value provide current to each LED. R SET and V BRGT
should therefore be chosen so that the current through each output is programmed to 50% of the desired current
through the parallel connected LEDs. For example, if 30mA is the desired drive current for 2 parallel connected
LEDs , R SET and V BRGT should be selected so that the current through each of the outputs is 15mA. Other
C 1
1 … F
C 2
1 … F
3.0V
V IN
C 1 -
C 1 + C 2 -
C 2 +
P OUT
C IN
1 … F
BRGT
LM2794/95
GND
C POUT
1 … F
R SET
D 1
D 2
D 3
D 4
124 :
15mA
60mA
Figure 26. One Parallel Connected LED
Connecting outputs in parallel does not affect internal operation of the LM2794/95 and has no impact on the
Electrical Characteristics and limits previously presented. The available diode output current, maximum diode
voltage, and all other specifications provided in the Electrical Characteristics table apply to parallel output
configurations, just as they do to the standard 4-LED application circuit.
THERMAL PROTECTION
When the junction temperature exceeds 150°C (typ.), the LM2794/5 internal thermal protection circuitry disables
the part. This feature protects the device from damage due to excessive power dissipation. The device will
recover and operate normally when the junction temperature falls below 140°C (typ.). It is important to have good
thermal conduction with a proper layout to reduce thermal resistance.
Copyright ? 2002–2013, Texas Instruments Incorporated
Product Folder Links: LM2794 LM2795
15
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| LM27961TL/NOPB | 功能描述:IC LED DRVR WHT BCKLT 18USMD RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
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