NSLM508875V輸入異步降壓電源控制方案

1、NSLM508875V輸入異步降壓電源控制方案    NS公司的LM5088是75V高電壓輸入異步穩(wěn)壓控制器,能驅(qū)動(dòng)高邊N-MOSFET,具有能以最少外接元件來(lái)實(shí)現(xiàn)高效高輸入電壓降壓轉(zhuǎn)換器所需要的全部功能。LM50888的輸入電壓可從4.5V到75V,開(kāi)關(guān)頻率從50kHz到1MHz可編程。本文介紹了LM5088的主要特性,方框圖和應(yīng)用電路,以及兩種評(píng)估板電路圖與所用材料清單。LM5088:WideInputRangeNon-SynchronousBuckControllerTheLM5088highvoltagenon-synchronousbuckco

2、ntrollerfeaturesallthenecessaryfunctioNS 公司的LM5088是75V高電壓輸入異步穩(wěn)壓控制器,能驅(qū)動(dòng)高邊N-MOSFET,具有能以最少外接元件來(lái)實(shí)現(xiàn)高效高輸入電壓降壓轉(zhuǎn)換器所需要的全部功能。LM50888的輸入電壓可從4.5V到75V,開(kāi)關(guān)頻率從50kHz到1MHz可編程。本文介紹了LM5088的主要特性,方框圖和應(yīng)用電路,以及兩種評(píng)估板電路圖與所用材料清單。LM5088: Wide Input Range Non-Synchronous Buck ControllerThe LM5088 high voltage non-synchronous buc

3、k controller features all the necessary functions to implement an efficient high voltage buck converter using a minimum number of external components. The LM5088 can be configured to operate over an ultra-wide input voltage range of 4.5V to 75V. This easy to use controller includes a level shifted g

4、ate driver capable of controlling an external N-channel buck switch. The control method is based upon peak current mode control utilizing an emulated current ramp. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very s

5、mall duty cycles necessary in high input voltage/low output voltage applications.The LM5088 switching frequency is programmable from 50 kHz to 1 MHz. The LM5088 is available in two versions: The LM5088-1 provides a +/-5% frequency dithering function to reduce the conducted and radiated EMI, while th

6、e LM5088-2 provides a versatile restart timer for overload protection. Additional features include a low dropout bias regulator, tri-level enable input to control shutdown and standby modes, soft-start and oscillator synchronization capability. The device is available in a thermally enhanced TSSOP-1

7、6EP pin package.LM5088主要特性: Emulated current mode control Drives external high-side N-channel MOSFET Ultra-wide input voltage range from 4.5V to 75V Low IQ Shutdown and Standby modes High duty cycle ratio feature for reduced dropout voltage Spread spectrum EMI reduction (LM5088-1) Hiccup timer for overload protection (LM5088-2) Adjustable output voltage from 1.205V with 1.5% feedback reference accuracy Wide bandwidth error amplifier Single resistor oscillator frequency setting Oscillator synchronization capability Programmable soft-start High voltage, low dro