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| 型号： | LM2794EVAL |
| 厂商： | National Semiconductor |
| 文件页数： | 15/23页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION LM2794 |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 80mA |
| 输出及类型： | 4，非隔离 |
| 输出电压： | 4V |
| 特点： | 充电泵 |
| 输入电压： | 2.7 ~ 5.5 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | LM2794 |
| 相关产品： | LM2794TLX/NOPB-ND - IC LED DRVR WHT BCKLT 14USMD LM2794BLDKR-ND - IC LED DRVR WHT BCKLT 14USMD LM2794TL/NOPBCT-ND - IC LED DRVR WHT BCKLT 14MICROSMD LM2794TL/NOPBTR-ND - IC LED DRVR WHT BCKLT 14MICROSMD LM2794BLCT-ND - IC LED DRVR WHT BCKLT 14USMD LM2794BLTR-ND - IC LED DRVR WHT BCKLT 14USMD |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2794TL | 功能描述:IC LED DRVR WHT BCKLT 14MICROSMD RoHS:否 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 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:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| LM2794TL/NOPB | 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| LM2794TLX | 功能描述:IC LED DRVR WHT BCKLT 14USMD RoHS:否 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 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:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| LM2794TLX/NOPB | 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| LM2795 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
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