原标题：On Semi NCV8876汽车起-停控制解决方案

　　On Semi公司的NCV8876是汽车级起-停非同步升压控制器,能驱动外接N沟MOSFET.器件采用峰值电流模式控制和内部斜率补偿,保护特性包括逐个周期限流,保护和关断.主要用在汽车起动/停止控制.本文介绍了NCV8876主要特性和典型应用电路以及评估板NCV887601主要特性,电路图,材料厂清单和PCB布局图.

　　The NCV8876 is a Non-Synchronous Boost controller designed to supply a minimum output voltage during Start-Stop vehicle operation battery voltage sags. The controller 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, cycle-by-cycle current limiting, protection and thermal shutdown.

　　Additional features include low quiescent current sleep mode operation. The NCV8876 is enabled when the supply voltage drops below 7.3 V, with boost operation initiated when the supply voltage is below 6.8 V.

　　NCV8876主要特性:

　　• Automatic Enable Below 7.3 V (Factory Programmable)

　　• Boost Mode Operation at 6.8 V

　　• _2% Output Accuracy Over Temperature Range

　　• Peak Current Mode Control with Internal Slope Compensation

　　• Externally Adjustable frequency Operation

　　• Wide Input Voltage Range of 2 V to 40 V, 45 V Load Dump

　　• Low Quiescent Current in Sleep Mode (<11uA Typical)

　　• Cycle−by−Cycle Current Limit Protection

　　• Hiccup−Mode Overcurrent Protection (OCP)

　　• Thermal Shutdown (TSD)

　　• This is a Pb−Free Device

　　NCV8876典型应用:

　　• Applications Requiring Regulated Voltage through Cranking and Start−Stop Operation

　　图1. NCV8876典型应用电路

　　评估板NCV887601

　　This NCV887601 evaluation board provides a convenient way to evaluate a high frequency boost controller designed to supply a minimum output voltage during Start-Stop vehicle battery voltage sags. The unit is in low Iq sleep-mode under normal battery operating condition and will wake-up when the monitored voltage drops below 7.3 V and begin regulating once 6.8 V is reached. Switching frequency is set to 440 kHz with a user selectable ROSC resistor. The evaluation board is rated 6.8 V / 3.6 A at a 2.6 V input voltage. Operation below 2.6 V is possible if output current is reduced.

　　评估板NCV887601主要特性:

　　• Automatic enable below 7.3 V

　　• Boost Operation at 6.8 V

　　• 440 kHz Switching Frequency

　　• Input Undervoltage Lockout

　　• Wide Input Voltage of 2.6 V to 45 V

　　• Low Quiescent Current in Sleep Mode (<11 uA Typical)

　　• Cycle-by-Cycle Current Limit Protection

　　• Status Monitoring

　　• Automotive Grade

　　图2. 评估板NCV887601外形图

　　评估板NCV887601材料清单: