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参数资料
| 型号： | MIC2290YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 7/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.5A 8MLF |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 34 V |
| 输入电压： | 2.5 V ~ 10 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘，8-MLF? |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-MLF?（2x2） |
| 产品目录页面： | 1093 (CN2011-ZH PDF) |
| 其它名称： | 576-1076-6 |
Micrel, Inc.
Functional Diagram
MIC2290
VIN
FB
EN
OUT
OVP
SW
V REF
1.24V
g m
1.2MHz
Oscillator
PWM
Generator
S
Ramp
Generator
CA
GND
Figure 1. MIC2290 Block Diagram
Functional Description
The MIC2290 is a constant frequency, PWM current
mode boost regulator. The block diagram is shown in
Figure 1. The MIC2290 is composed of an oscillator,
slope compensation ramp generator, current amplifier,
g m error amplifier, PWM generator, and a 0.5A bipolar
output transistor. The oscillator generates a 1.2MHz
clock. The clock’s two functions are to trigger the PWM
generator that turns on the output transistor, and to reset
the slope compensation ramp 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 compensation ramp
generator. This summed current-loop signal is fed to one
of the inputs of the PWM generator.
The g m error amplifier measures the feedback voltage
through the external feedback resistors and amplifies the
error between the detected signal and the 1.24V
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.
October 2007
7
M9999-101907
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| MIC2291-15BML TR | 功能描述:IC LED DRIVER PHOTO FLASH 8-MLF RoHS:否 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，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:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
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