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[原创] On Semi NCV898031汽车SEPIC-升压控制器解决方案

关键词:汽车电子 DC/DC转换器 SEPIC 起停系统 NCV898031

时间:2014-10-23 11:13:03       作者:On Semi       来源:中电网

On Semi公司的NCV898031是单端初级电感转换器(SEPIC)/升压控制器,驱动外接的N沟MOSFET,开关频率2MHz.输入电压从3.2V到45V,1.2V 2%精度基准电压,采用内部斜率补偿的峰值电流模式控制,主要用于汽车的起停系统,头灯和后灯,直喷汽油,小型POL电源,SEPIC,升压和反激电源等.本文介绍了NCV898031主要特性,框图和应用电路,以及SEPIC和升压电流模式电路图, NCV898031评估板主要特性,电路图,材料清单和PCB元件布局图与连接图.

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应用:

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

图1. NCV898031简化框图和应用电路

图2.SEPIC电流模式电路图

图3.升压电流模式电路图

NCV898031评估板

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评估板主要特性:

• 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

图4. NCV898031 SEPIC评估板外形图

图5. NCV898031 SEPIC评估板电路图
NCV898031 SEPIC评估板材料清单:


图5. NCV898031 SEPIC评估板PCB元件布局图和连接图
详情请见:
http://www.onsemi.cn/pub_link/Collateral/NCV898031-D.PDF
http://www.onsemi.cn/pub_link/Collateral/EVBUM2167-D.PDF

EVBUM2167-D.PDF
NCV898031-D.PDF
NCV898031SEPGEVB_BOM_ROHS.PDF
NCV898031SEPGEVB_SCHEMATIC.PDF
NCV898031SEPGEVB_GERBER.ZIP

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