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| NCV898031 汽車SEPIC－升壓控制器解決方案 |
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| 文章來源： 更新時間：2014/10/24 13:00:00 |
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On Semi公司的NCV898031是單端初級電感轉換器(SEPIC)/升壓控制器,驅動外接的N溝MOSFET,開關頻率2MHz.輸入電壓從3.2V到45V,1.2V 2%精度基準電壓,采用內部斜率補償的峰值電流模式控制,主要用于汽車的起停系統,頭燈和后燈,直噴汽油,小型POL電源,SEPIC,升壓和反激電源等.本文介紹了NCV898031主要特性,框圖和應用電路,以及SEPIC和升壓電流模式電路圖, NCV898031評估板主要特性,電路圖,材料清單和PCB元件布局圖與連接圖.
The NCV898031 is an adjustable output non-synchronous 2 MHz SEPIC/boost controller which drives an external N-channel MOSFET. The device uses peak current mode control with internal slope compensation. The IC incorporates an internal regulator that supplies charge to the gate driver.
Protection features include internally-set soft-start, undervoltage lockout, cycle-by-cycle current limiting and thermal shutdown.
Additional features include low quiescent current sleep mode and microprocessor compatible enable pin.
NCV898031主要特性:
• Peak Current Mode Control with Internal Slope Compensation
• 1.2 V _2% Reference Voltage
• 2 MHz Fixed Frequency Operation
• Wide Input Voltage Range of 3.2 V to 40 V, 45 V Load Dump
• Input Undervoltage Lockout (UVLO)
• Internal Soft−Start
• Low Quiescent Current in Sleep Mode (< 10 _A Typical)
• Cycle−by−Cycle Current Limit Protection
• Hiccup−Mode Overcurrent Protection (OCP)
• Hiccup−Mode Short−Circuit Protection (SCP)
• Thermal Shutdown (TSD)
• NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
• This is a Pb−Free Device
NCV898031應用:
Start-Stop Systems
SEPIC (Non-Inverting Buck-Boost), Boost, Flyback, Forward Converter Topologies
Direct Gas Injection
Small Form Factor Point−of−Load Power Regulation
Headlamps
Backlighting
圖1. NCV898031簡化框圖和應用電路
圖2.SEPIC電流模式電路圖
圖3.升壓電流模式電路圖
NCV898031評估板
The NCV898031 is an adjustable output non-synchronous 2 MHz SEPIC/boost controller which drives an external N-channel MOSFET. The device uses peak current mode control with internal slope compensation. The IC incorporates an internal regulator that supplies charge to the gate driver. Protection features include internally-set soft-start, undervoltage lockout, cycle-by-cycle current limiting and thermal shutdown.
This NCV898031 evaluation board provides a convenient way to evaluate a high-frequency current-mode control SEPIC converter design. The topology uses two inductors.
No additional components are required, other than dc supplies for the input and enable voltages. The output is rated 7 V/8.5 W with a 2 MHz switching frequency over the typical 6 V to 18 V automotive input voltage range.
NCV898031評估板主要特性:
• 7 V/1.22 A Output
• 2 MHz Switching Frequency
• Input Undervoltage Lockout
• Internal Soft-Start
• Wide Input Voltage of 6 V to 40 V
• Regulates through Load Dump Conditions
• Automotive Grade
圖4. NCV898031 SEPIC評估板外形圖
圖5. NCV898031 SEPIC評估板電路圖
NCV898031 SEPIC評估板材料清單:
圖5. NCV898031 SEPIC評估板PCB元件布局圖和連接圖 |
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