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參數資料
| 型號： | LM3478MMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | High Efficiency Low-Side N-Channel Controller for Switching Regulator |
| 中文描述： | 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數： | 1/21頁 |
| 文件大小： | 624K |
| 代理商： | LM3478MMX |
LM3478
High Efficiency Low-Side N-Channel Controller for
Switching Regulator
General Description
The LM3478 is a versatile Low-Side N-FET switching regu-
lator controller. It is suitable for use in topologies requiring
low side FET, such as boost, flyback, SEPIC, etc. Moreover,
the LM3478 can be operated at extremely high switching
frequency in order to reduce the overall solution size. The
switching frequency of LM3478 can be adjusted to any value
between 100kHz and 1MHz by using a single external resis-
tor. Current mode control provides superior bandwidth and
transient response, besides cycle-by-cycle current limiting.
Output current can be programmed with a single external
resistor.
The LM3478 has built in features such as thermal shutdown,
short-circuit protection, over voltage protection, etc. Power
saving shutdown mode reduces the total supply current to
5μA and allows power supply sequencing. Internal soft-start
limits the inrush current at start-up.
Key Specifications
n
Wide supply voltage range of 2.97V to 40V
n
100kHz to 1MHz Adjustable clock frequency
n
±
2.5% (over temperature) internal reference
n
10μA shutdown current (over temperature)
Features
n
8-lead Mini-SO8 (MSOP-8) package
n
Internal push-pull driver with 1A peak current capability
n
Current limit and thermal shutdown
n
Frequency compensation optimized with a capacitor and
a resistor
n
Internal softstart
n
Current Mode Operation
n
Undervoltage Lockout with hysteresis
Applications
n
Distributed Power Systems
n
Battery Chargers
n
Offline Power Supplies
n
Telecom Power Supplies
n
Automotive Power Systems
Typical Application Circuit
10135501
Typical High Efficiency Step-Up (Boost) Converter
May 2003
L
2003 National Semiconductor Corporation
DS101355
www.national.com
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相關代理商/技術參數 |
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|---|---|
| LM3478MMX/HALF | 制造商:Texas Instruments 功能描述: |
| LM3478MMX/NOPB | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM3478MMX/S5000472 | 制造商:Texas Instruments 功能描述: |
| LM3478Q | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Efficiency Low-Side N-Channel Controller for Switching Regulator |
| LM3478QMM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Efficiency Low-Side N-Channel Controller for Switching Regulator |
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