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| 型号： | MIC2171WU |
| 厂商： | Micrel Inc |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 2.5A TO263-5 |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压），反相，Cuk |
| 输出数： | 1 |
| 输入电压： | 3 V ~ 40 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 包装： | 管件 |
| 供应商设备封装： | TO-263-5 |
| 产品目录页面： | 1092 (CN2011-ZH PDF) |
| 其它名称： | 576-1063 |
Micrel, Inc.
Functional Diagram
MIC2171
IN
Reg.
2.3V
Anti-Sat.
D1
SW
100kHz
Osc.
Logic
Driver
Q1
FB
Error
1.24V Amp.
Ref.
Functional Description
Refer to “Block Diagram MIC2171”.
COMP
Com-
parator
Current
Amp.
GND
reliability and provides automatic output current limiting.
Finally, current-mode operation provides automatic input
voltage feed forward which prevents instantaneous input
Internal Power
The MIC2171 operates when V IN is ≥ 2.6V. An internal
2.3V regulator supplies biasing to all internal circuitry
including a precision 1.24V band gap reference.
PWM Operation
The 100kHz oscillator generates a signal with a duty
voltage changes from disturbing the output voltage
setting.
Anti-Saturation
The anti-saturation diode (D1) increases the usable duty
cycle range of the MIC2171 by eliminating the base to
collector stored charge which would delay Q1’s turnoff.
cycle of approximately
90%. The current-mode
Compensation
comparator output is used to reduce the duty cycle when
the current amplifier output voltage exceeds the error
amplifier output voltage. The resulting PWM signal
controls a driver which supplies base current to output
transistor Q1.
Current-Mode Advantages
The MIC2171 operates in current mode rather than
voltage mode. There are three distinct advantages to
this technique. Feedback loop compensation is greatly
simplified because inductor current sensing removes a
pole from the closed loop response. Inherent cycle-by-
cycle current limiting greatly improves the power switch
Loop stability compensation of the MIC2171 can be
accomplished by connecting an appropriate network
from either COMP to circuit ground (see “Typical
Applications”) or COMP to FB.
The error amplifier output (COMP) is also useful for soft
start and current limiting. Because the error amplifier
output is a transconductance type, the output impedance
is relatively high which means the output voltage can be
easily clamped or adjusted externally.
May 2007
5
M9999-051107
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2171WU TR | 功能描述:直流/直流开关调节器 2.5A 100kHz Switching Regulator (ROHS Compliant) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC2171WU-TR | 功能描述:Buck, Boost, Cuk, Flyback, Forward Converter Switching Regulator IC Positive or Negative, Isolation Capable Adjustable 1 Output 2.5A (Switch) TO-263-6, D2Pak (5 Leads + Tab), TO-263BA 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 功能:升压，降压，升压/降压 输出配置:正或负，可提供隔离 拓扑:降压，升压，Cuk，反激，正激转换器 输出类型:可调式 输出数:1 电压 - 输入（最小值）:3V 电压 - 输入（最大值）:40V 电压 - 输出（最小值/固定）:- 电压 - 输出（最大值）:65V（开关） 电流 - 输出:2.5A（开关） 频率 - 开关:100kHz 同步整流器:无 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:TO-263-6，D2Pak（5 引线+接片），TO-263BA 供应商器件封装:TO-263-5 标准包装:1 |
| MIC2172 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:100kHz 1.25A Switching Regulators |
| MIC2172_05 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:100kHz 1.25A Switching Regulators |
| MIC2172_06 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:100kHz 1.25A Switching Regulators |
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