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参数资料
| 型号： | FAN5345S20X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR ASYNC BOOST 20V 6SSOT |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 类型 - 次要： | 白色 LED |
| 频率： | 950kHz ~ 1.35MHz |
| 电源电压： | 2.5 V ~ 5.5 V |
| 输出电压： | 6.2 V ~ 18.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | 6-SSOT |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | FAN5345S20XDKR |
Application Information
The reference schematic diagram is shown in Figure 29.
FAN5345 is able to drive up to eight LEDs with input voltage
equal or greater than 2.9V (V IN ≥ 2.9V). However, the
number of LEDs that can be used depends on forward
voltage. It is recommended that the forward voltage (V F ) of
the white LEDs be no greater than 3.2V and the maximum
LED current is 20mA. FAN5345 can be also used as a boost
convertor by connect the V OUT point to the load directly. The
return trace of the load should also return to GND through a
sense resistor (R1).
Figure 29. Reference Application Schematic Diagram
Component Placement and PCB
Recommendations
Figure 30. Reference PCB Layout
FAN5345 switches at 1.2MHz to boost the output voltage.
Component placement and PCB layout need to be carefully
taken into consideration to ensure stable output and to
? 2011 Fairchild Semiconductor Corporation
FAN5345 ? Rev. 1.0.0
11
prevent generation of noise. Figure 30 is the FAN5345 a
portion of the evaluation board layout. The critical layout
elements are: the L1, C IN , C IN return trace, C OUT , and the
C OUT return trace.
Input Capacitor and Return Trace
The input capacitor is the first priority in a switching buck or
boost regulator layout. A stable input source (V IN ) enables a
switching regulator to deliver its best performance. During
the regulator’s operation, it is switching at a high frequency,
which makes the load of C IN change dynamically to make the
input source vary at the same switching frequency as the
regulator. To ensure a stable input source, C IN needs to hold
enough energy to minimize the variation at the input pin of
the regulator. For C IN to have a fast response of charge /
discharge, the trace from C IN to the input pin of the regulator
and the return trace from GND of the regulator to C IN should
be as short and wide as possible to minimize trace
resistance, inductance, and capacitance. During operation,
the current flow from C IN through the regulator to the load
and back to C IN contains high-frequency variation due to
switching. Trace resistance reduces the overall efficiency
due to I 2 R loss. Even a small trace inductance could
effectively yield ground variation to add noise on V OUT . The
input capacitor should be placed close to the VIN and GND
pins of the regulator and traces should be as short as
possible. Avoid routing the return trace through different
layers because vias have strong inductance effect at high
frequencies. If routing to other PCB layers is unavoidable,
place vias next to the VIN and GND pins of the regulator to
minimize the trace distance.
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN5345S30X | 功能描述:LED照明驱动器 Async Series Driver SingleWire Dig Intfc 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 |
| FAN5346 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Series Boost LED Driver with PWM Dimming Interface |
| FAN5346S20X | 功能描述:LED照明驱动器 Async Series Driver ANLG PWM DIM Intfc 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 |
| FAN5346S30X | 功能描述:LED照明驱动器 Async Series Driver ANLG PWM DIM Intfc 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 |
| FAN5350 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:3MHz, 600mA Step-Down DC-DC Converter in Chip-Scale and MLP Packaging |
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