On Semi NCV8876汽车启动－停止控制解决方案

On Semi公司的NCV8876是异步升压DC/DC转换控制器,升压模式工作在6.8V,在汽车启动-停止控制电池电压上提供最低输出电压,输出电压精度2%,输入电压2V－40V.本文介绍了NCV8876主要特性和典型应用框图, 评估板NCV887601主要特性,电路图,材料清单和PCB元件布局图.
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 (<11 A 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典型应用框图
评估板NCV887601
NCV887601BSTGEVB: Automotive High-Frequency Boost Controller Evaluation Board
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...