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| 型号： | MSL2041GU |
| 厂商： | Atmel |
| 文件页数： | 18/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER 4 STRING |
| 产品培训模块： | Industrial Panel Backlighting Driver ICs LED Lighting Drivers LED Driver Basics |
| 标准包装： | 1,000 |
| 系列： | Adaptive SourcePower™ |
| 拓扑： | 交直流离线开关，PWM |
| 输出数： | 4 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 通用 |
| 电源电压： | 10.8 V ~ 13.2 V |
| 输出电压： | 9.6V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 32-SOP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
Choosing the Drain Resistor R D
The drain resistor R D connects the MSL2041/2 to
the Drain of the external MOSFET. Choose R D using:
Table 2. Some Typical I DARK and V F(DARK) Values Determined
Using Figure 7
Ω ,
LED
TYPE
LOW
POWER
LED
PART #
LW Y1SG
I DARK (μA)
1.72
V F(DARK) (V)
2.285
LW G6SP
1.67
2.276
LXLW-PWC1
1.72
2.195
where V OUT(MAX) is the value calculated above in the
section “ Connecting the Efficiency Optimizer to an LED
String Power Supply and Selecting Resistors ” beginning
on page12, N is the number of LEDs in the string, I DARK
is the maximum allowable string off current and V F(DARK)
is the LED forward voltage drop at I DARK . When the value
calculated for R D < 0 use 0 Ω .
LED manufacturers typically do not publish I DARK and
V F(DARK) information. One way to determine these
numbers is to use the following method.
Set up the test circuit of Figure 7. Adjust R1
until the current meter indicates I DARK (choose
I DARK < 1mA). Use a volt meter to measure
the voltage at the anode of the LED (A),
MEDIUM
POWER
HIGH
POWER
Large values of R D may cause false LED short circuit
faults. Discharge of the parasitic capacitance at the Dn
node through a large R D holds the node above the
string fault threshold for longer than the LED short
circuit verification time. The addition of a feed-forward
capacitor, C FF in Figure 8, mitigates this issue. The
value for C FF depends upon the amount of parasitic
capacitance at the Dn node and the size of R D , but C FF
= 15pF is an appropriate first approximation.
and then at the cathode of the LED (B).
Subtract the voltage measured at B from that
measured at A to determine V F(DARK) . Some
typical values determined using this method
are listed in Table 2.
?
Figure 8. Feed Forward Capacitor
Figure 7. Test Circuit for Determining
Figure 7. Test Circuit for Determining V F(DARK)
18
Figure 8. Feed Forward Capacitor
Atmel LED Drivers-MSL2041/2042
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MSL2041GU-R | 功能描述:LED照明驱动器 Low-Cost, Simple 4-String LED Drivers 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 |
| MSL2042 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Low-cost, Simple 4-string LED Drivers with External Current Sink MOSFETs, 5000:1 Dimming Range and Per String PWM Input |
| MSL2042GU | 功能描述:LED照明驱动器 4Str RGB or White LED Driver lighting 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 |
| MSL2042GU-R | 功能描述:LED照明驱动器 4Str RGB or White LED Driver lighting 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 |
| MSL-204AUYL-4 | 制造商:Unity Microelectronics Inc 功能描述:LED Uni-Color Amber 592nm 4-Pin SMD T/R |
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