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参数资料
| 型号： | MIC2293-34YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER WHITE BCKLGT 8-MLF |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 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： | 1.75MHz ~ 2.25MHz |
| 电源电压： | 2.5 V ~ 10 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘，8-MLF? |
| 供应商设备封装： | 8-MLF?（2x2） |
| 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： | 576-2657-6 |
Micrel, Inc.
Functional Diagram
MIC2292/93 Functional Diagram
MIC2292/93
Functional Description
The MIC2292/93 is a constant frequency, PWM current-
mode boost regulator. The block diagram is shown
above. The MIC2292/93 is composed of an oscillator,
slope compensation ramp generator, current amplifier,
g m error amplifier, PWM generator, 500mA bipolar output
transistor, and Schottky rectifier diode. The oscillator
generates a 1.6MHz clock for the MIC2292 and a
2.0MHz clock for the MIC2293. The clocks' two functions
are to trigger the PWM generator that turns on the output
transistor and to reset the slope compensation ramp
The g m error amplifier measures the LED current through
the external sense resistor and amplifies the error
between the detected signal and the 95mV reference
voltage. The output of the g m error amplifier provides the
voltage-loop signal that is fed to the other input of the
PWM generator. When the current-loop signal exceeds
the voltage-loop signal, the PWM generator turns off the
bipolar output transistor. The next clock period initiates
the next switching cycle, maintaining the constant
frequency current-mode PWM control. The LED is set by
the feedback resistor:
generator. The current amplifier is used to measure the
switch current by amplifying the voltage signal from the
internal sense resistor. The output of the current
amplifier is summed with the output of the slope
I
LED
=
95mV
R
FB
compensation ramp generator. This summed current-
loop signal is fed to one of the inputs of the PWM
generator.
The Enable pin shuts down the output switching and
disables control circuitry to reduce input current to
leakage levels. Enable pin input current is zero at zero
volts.
April 2012
8
M9999-040212-B
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相关代理商/技术参数 |
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| MIC2293C | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP |
| MIC2293C-15BML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP |
| MIC2293C-15YML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP |
| MIC2293C-34BML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP |
| MIC2293C-34YML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP |
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