原标题：On Semi NCV898031汽车SEPIC-升压控制器解决方案

　　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

　　NCV898031 SEPIC评估板材料清单: