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參數(shù)資料
| 型號： | MIC2295 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | High Power Density 1.2A Boost Regulator |
| 中文描述： | 高功率密度1.2A的升壓穩(wěn)壓器 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 1267K |
| 代理商： | MIC2295 |
Micrel
MIC2295
July 2004
M9999-052402
(408) 955-1690
8
Functional Description
The MIC2295 is a high power density, PWM dc/dc
boost regulator. The block diagram is shown in
Figure 1. The MIC2295 is composed of an oscillator,
slope compensation ramp generator, current
amplifier, gm error amplifier, PWM generator, and a
1.2A 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 constant frequency
current-mode PWM control
GND
CA
PWM
Generator
Ramp
Generator
1.2MHz
Oscillator
SW
EN
FB
OVP*
VIN
1.24V
*
OVP available on MLF
TM
package option only.
g
m
OVP*
Σ
V
REF
MIC2295
MIC2295 Block Diargam
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相關(guān)代理商/技術(shù)參數(shù) |
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| MIC2295_05 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:High Power Density 1.2A Boost Regulator |
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| MIC22950YML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:10A Integrated Switch Synchronous Buck Regulator with Frequency Programmable to 2MHz |
| MIC22950YML TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 10A Integrated Switch Synchronous Buck Regulator w/ Frequency Progammable to 2 MHz RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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