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參數(shù)資料
| 型號： | LM5027AMHX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 561K |
| 代理商： | LM5027AMHX |
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30111916
FIGURE 12. UVLO Circuit with Shutdown Control
Oscillator
The oscillator frequency is generally selected in conjunction
with the system magnetic components and any other aspects
of the system which may be affected by the frequency. The
R
T resistor selection equation is specified in the Oscillator and
Sync Capability section. If the required frequency tolerance is
critical in particular application, the tolerance of the external
resistor and the frequency tolerance specified in the Electrical
Characteristics table must be considered when selecting the
R
T resistor.
Voltage Feedback
The COMP pin is designed to accept a current input typically
from an opto-coupler. A typical configuration is shown in Fig-
ure 13, where the emitter of the opto-coupler transistor is
connected to the COMP pin and the collector is connected to
the REF pin of the LM5027A. When the output voltage is be-
low regulation, no current flows into the COMP pin and the
LM5027A operates at maximum duty cycle. At the secondary
side, VOUT is compared to a reference by the error amplifier
which has an appropriate frequency compensation network.
The amplifier output drives the opto-coupler, which in turn
drives the LM5027A COMP pin current mirror.
30111917
FIGURE 13. Typical COMP Configuration
21
www.national.com
LM5027A
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM5027AMHX/NOPB | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| LM5027ASQ/NOPB | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| LM5027ASQX/NOPB | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| LM5027MH | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Voltage Mode Active Clamp Controller |
| LM5027MH/NOPB | 功能描述:電壓模式 PWM 控制器 Voltage Mode Active Clamp Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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