NS LM5118宽电压升/降压电源方案
    

NS公司的LM5118是宽电压升压/降压开关电源控制器,它集成了实现高性能高性价比的降压/升压稳压器所需的所有功能,从而是外接元件数最少. LM5118的工作电压从3.5V到75V,可编程开关频率可高达到500kHz,具有可编程软起动时间,超低的关断电流和热保护等功能,具有广泛的用途.本文介绍了LM5118的主要特性,方框图以及典型的应用电路图和LM5118评估板的主要性能和详细的电路图以及所用材料清单(BOM).

The LM5118 wide voltage range Buck-Boost switching regulator controller features all of the functions necessary to implement a high performance, cost efficient Buck-Boost regulator using a minimum of external components. The Buck-Boost topology maintains output voltage regulation when the input voltage is either less than or greater than the output voltage making it especially suitable for automotive applications. The LM5118 operates as a buck regulator while the input voltage is sufficiently greater than the regulated output voltage and gradually transitions to the buck-boost mode as the input voltage approaches the output. This dual mode approach maintains regulation over a wide range of input voltages with optimal conversion efficiency in the buck mode and a glitch-free output during mode transitions. This easy to use controller includes drivers for the high side buck MOSFET and the low side boost MOSFET. The regulator’s control method is based upon current mode control utilizing an emulated current ramp.mulated current mode control reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of the very small duty cycles necessary in high input voltage applications. Additional protection features include current limit, thermal shutdown and an enable input. The device is available in a power enhanced TSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation.

LM5118主要特性:

■ Ultra-wide input voltage range from 3V to 75V

■ Emulated peak current mode control

■ Smooth transition between step-down and step- up modes

■ Switching frequency programmable to 500KHz

■ Oscillator synchronization capability

■ Internal high voltage bias regulator

■ Integrated high and low-side gate drivers

■ Programmable soft-start time

■ Ultra low shutdown current

■ Enable input wide bandwidth error amplifier

■ 1.5% feedback reference accuracy

■ Thermal shutdown

达普芯片交易网:www.ic72.com

达普芯片交易网:www.ic72.com

图1.LM5118方框图和典型应用电路图

达普芯片交易网:www.ic72.com

图2.12V/3A典型应用电路图

LM5118评估板

The LM5118 evaluation board is designed to provide the design engineer with a fully functional, Emulated Current Mode Control, buck-boost power converter to evaluate the LM5118 controller IC. The evaluation board provides a 12V output with 3A of output current capability. The evaluation board’s wide input voltage range is from 75V to 5V, with operation down to 3V with some component changes. The evaluation board operates at 300 kHz, a good compromise between conversion efficiency, tradeoffs between buck and buck-boost mode requirements, and converter size. The printed circuit board consists of 4 layers with 2 ounce copper top and bottom, and 1 ounce copper on internal layers. The board is constructed with FR4 material. This application note contains the evaluation board schematic, Bill -of-Materials (BOM) and a quick setup procedure. Refer to the LM5118 data sheet and quick start for more complete circuit and design information.

LM5118 IC特性:

Integrated high and low side driver

Internal high voltage bias regulator

Ultra-wide input voltage range: 5V to 75V

Emulated current mode control

Single inductor architecture

VOUT operation below and above VIN

Single resistor sets oscillator frequency

Oscillator synchronization capability

Programmable soft-start

Ultra low (<10 μA) shutdown current

Enable input

Wide bandwidth error amplifier

Adjustable output voltage 1.23V-75V

1.5% feedback reference accuracy

Thermal Shutdown

No VIN to VOUT connection during fault protection

达普芯片交易网:www.ic72.com

图3. LM5118应用框图

达普芯片交易网:www.ic72.com

图4. LM5118评估板电路图

下表为LM5118评估板材料清单(BOM)

达普芯片交易网:www.ic72.com

相关阅读
  • TI TPS63020高效小型升降压电源解
  • maxim max5974宽输入电压poe电源解
  • NS推出降压/升压直流/直流稳压器控
  • 适合光伏宽电压的新型单级升降压逆
  • 基于TPS63020的高效小型升降压电源
  • 基于TPS63020的高效小型升降压电源
  • Linear LTM4609 98%高效升降压稳压
  • Linear LTM4609 98%高效升降压稳压
  • 宽输入范围的中等电压LED应用DC-DC
  • 宽输入范围的中等电压led应用dc-dc
  • 基于恒流驱动模式的宽电压输入串联
  • Linear 双路多相降压电源控制方案
  • 支持多种输入电压的电源解决方案-A
  • 非隔离降压型电源设计方案
  • Linear LTC3855双路多相降压电源控
  • 基于ISL911x高度集成升降压电源电
  • 基于ISL911x高度集成升降压电源电
  • 基于 LM5017 的反相升降压电路支持
  • 基于 LM5017 的反相升降压电路支持
  • linear推出双输入、宽电压范围同步
  • 宽输入电压范围降/升压转换器简化
  • 【图】宽输入电压的开关电源电路开
  •  



     
     
         

    收录时间:2015年11月17日 14:37:35 来源:达普IC芯片交易网 作者:匿名
    上一篇:煤矿井下变电工操作规程  (电脑版  手机版)
     
    创建分享人
    舜问乎丞
    最新问题
     
    喜欢此文章的还喜欢
    Copyright by www.chinabaike.com;All rights reserved. 联系:QQ:469681782