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參數(shù)資料
| 型號： | LM3477 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | High Efficiency High-Side N-Channel Controller for Switching Regulator |
| 中文描述： | 高效率高側(cè)N溝道開關(guān)穩(wěn)壓器控制器 |
| 文件頁數(shù)： | 1/23頁 |
| 文件大小： | 815K |
| 代理商： | LM3477 |
LM3477/LM3477A
High Efficiency High-Side N-Channel Controller for
Switching Regulator
General Description
The LM3477/A is a high-side N-channel MOSFET switching
regulator controller. It can be used in topologies requiring a
high side MOSFET such as buck, inverting (buck-boost) and
zeta regulators. The LM3477/A’s internal push pull driver
allows compatibility with a wide range of MOSFETs. This, the
wide input voltage range, use of discrete power components
and adjustable current limit allows the LM3477/A to be opti-
mized for a wide variety of applications.
The LM3477/Auses a high switching frequency of 500kHz to
reduce the overall solution size. Current-mode control re-
quires only a single resistor and capacitor for frequency
compensation. The current mode architecture also yields
superior line and load regulation and cycle-by-cycle current
limiting. A 5μA shutdown state can be used for power sav-
ings and for power supply sequencing. Other features in-
clude internal soft-start and output over voltage protection.
The internal soft-start reduces inrush current. Over voltage
protection is a safety feature to ensure that the output volt-
age stays within regulation.
The LM3477A is similar to the LM3477. The primary differ-
ence between the two is the point at which the device
transitions into hysteretic mode. The hysteretic threshold of
the LM3477A is one-third of the LM3477.
Features
n
500kHz switching frequency
n
Adjustable current limit
n
1.5% reference
n
Thermal shutdown
n
Frequency compensation optimized with a single
capacitor and resistor
n
Internal softstart
n
Current mode operation
n
Undervoltage lockout with hysteresis
n
8-lead Mini-SO8 (MSOP-8) package
Applications
n
Local Voltage Regulation
n
Distributed Power
n
Notebook and Palmtop Computers
n
Internet Appliances
n
Printers and Office Automation
n
Battery operated Devices
n
Cable Modems
n
Battery Chargers
Hysteretic
Threshold
)
36% of
programmed current
limit
)
12% of
programmed current
limit
LM3477
LM3477A
*
See Hysteretic Threshold and section for more information.
Typical Application Circuit
20003333
Typical High Efficiency Step-Down (Buck) Converter
June 2002
L
2002 National Semiconductor Corporation
DS200033
www.national.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM3477A | High Efficiency High-Side N-Channel Controller for Switching Regulator |
| LM3477AMM | High Efficiency High-Side N-Channel Controller for Switching Regulator |
| LM3477AMMX | High Efficiency High-Side N-Channel Controller for Switching Regulator |
| LM3477MM | High Efficiency High-Side N-Channel Controller for Switching Regulator |
| LM3477MMX | High Efficiency High-Side N-Channel Controller for Switching Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3477A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Efficiency High-Side N-Channel Controller for Switching Regulator |
| LM3477AMM | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM3477AMM/NOPB | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM3477AMMX | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM3477AMMX/NOPB | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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