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参数资料
| 型号： | MIC2297-42YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/11页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 10-MLF |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 525kHz ~ 675kHz |
| 电源电压： | 2.5 V ~ 10 V |
| 输出电压： | 40V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘，10-MLF? |
| 供应商设备封装： | 10-MLF?（3x3） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1082 (CN2011-ZH PDF) |
| 其它名称： | 576-1440-6 |
f zero =
f pole =
I LED =
Micrel
Reference Capacitor
A 1uF ceramic should be used on the reference pin to
prevent noise from getting into this node. A 1uF ceramic is
needed when a PWM signal is connected to the BRT pin.
Diode Selection
The MIC2297 requires an external diode for operation. A
Schottky diode is recommended for most applications due
to their lower forward voltage drop and reverse recovery
time. Ensure the diode selected can deliver the peak
inductor current and the maximum reverse voltage is rated
greater than the output voltage.
Input capacitor
A minimum 1 F ceramic capacitor with an X5R or X7R
dielectric is recommended for designing with the MIC2297.
Increasing input capacitance will improve performance and
greater noise immunity on the source. The input capacitor
should be as close as possible to the inductor and the
MIC2297, with short traces for good noise performance.
The MIC2297 utilizes a feedback pin to compare the LED
current to an internal reference. The LED current is
adjusted by selecting the appropriate feedback resistor
value. The desired output current can be calculated as
follows:
0.2 V
R
MIC2297
Compensation
The comp pin is connected to the output of the voltage
error amplifier. The voltage error amplifier is a
transconductance amplifier. Adding a series RC to ground
adds a zero at:
1
2 π R 1 C 1
The resistor typically ranges from 10kOhm to 50kOhm.
The capacitor typically ranges from 1nF to 100nF.
Adding a capacitor from comp to ground adds a pole at
1
2 π R 1 C 2
This capacitor typically ranges from 100pF to 10nF.
Generally an RC to ground is all that is needed. The RC
should be placed as close as possible to the comp pin.
The capacitor should be a ceramic with a X5R, X7R, or
COG dielectric.
Grounding
Both the AGND and PGND must be connected to the
exposed backside pad. The exposed backside pad also
improves thermal performance. A large ground plane
decreases thermal resistance to ambient air.
Mach 2008
10
M9999-032708
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相关代理商/技术参数 |
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|---|---|
| MIC2298 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3.5A Minimum, 1MHz Boost High Brightness White LED Driver |
| MIC2298_11 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3.5A Minimum, 1MHz Boost High Brightness White LED Driver |
| MIC2298-15YML | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC2298-15YML TR | 功能描述:LED照明驱动器 7W 1MHz White LED Driver 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 |
| MIC2298-15YMLTR | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
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