參數(shù)資料
型號(hào): LM5642
廠商: National Semiconductor Corporation
英文描述: High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
中文描述: 高電壓,雙同步降壓轉(zhuǎn)換器振蕩器同步
文件頁數(shù): 1/24頁
文件大?。?/td> 667K
代理商: LM5642
LM5642
High Voltage, Dual Synchronous Buck Converter with
Oscillator Synchronization
General Description
The LM5642 consists of two current mode synchronous
buck regulator controllers operating 180 out of phase with
each other at a normal switching frequency of 200kHz.
Out of phase operation reduces the input ripple RMS cur-
rent, thereby significantly reducing the required input capaci-
tance. The switching frequency can be synchronized to an
external clock between 150kHz and 250kHz. The two switch-
ing regulator outputs can also be paralleled to operate as a
dual-phase single output regulator.
The output of each channel can be independently adjusted
from 1.3 to 90% of Vin. An internal 5V rail is also available
externally for driving bootstrap circuitry.
Current-mode feedback control assures excellent line and
load regulation and a wide loop bandwidth for excellent
response to fast load transients. Current is sensed across
either the Vds of the top FET or across an external current-
sense resistor connected in series with the drain of the top
FET.
The LM5642 features analog soft-start circuitry that is inde-
pendent of the output load and output capacitance making
the soft-start behavior more predictable and controllable
than traditional soft-start circuits.
Over-voltage protection is available for both outputs. A UV-
Delay pin is also available to allow delayed shut off time for
the IC during an output under-voltage event.
Features
n
Two synchronous buck regulators
n
180 out of phase operation
n
Synchronizable switching frequency from 150kHz to
250kHz
n
4.5V to 36V input range
n
50μA Shutdown current
n
Adjustable output from 1.3V to 90% of Vin
n
0.04% (typical) line and load regulation error
n
Current mode control with or without a sense resistor
n
Independent enable/soft-start pins allow simple
sequential startup configuration.
n
Configurable for single output parallel operation. (See
Figure 2
)
n
Adjustable cycle-by-cycle current limit
n
Input under-voltage lockout
n
Output over-voltage latch protection
n
Output under-voltage protection with delay
n
Thermal shutdown
n
Self discharge of output capacitors when the regulator is
OFF
n
TSSOP package
Applications
n
Embedded Computer Systems
n
Telecom Systems
n
Set-Top Boxes
n
WebPAD
n
Point Of Load Power Architectures
Typical Application Circuit
20060101
September 2003
L
2003 National Semiconductor Corporation
DS200601
www.national.com
相關(guān)PDF資料
PDF描述
LM5642MTC High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
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LM565C
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM5642_07 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
LM5642EVAL-KIT 功能描述:BOARD EVALUATION LM5642 RoHS:否 類別:編程器,開發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC(離線)SMPS 系列:PowerWise® 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC,步升 輸出及類型:1,非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969
LM5642EVAL-KIT/NOPB 功能描述:電源管理IC開發(fā)工具 LM5642 EVAL KIT RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
LM5642MH 制造商:Texas Instruments 功能描述:
LM5642MH/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(fēng)格: 封裝 / 箱體:CPAK