文档介绍：Linear LTCR3805-5 SEPIC DC 电源转换解决方案关键词: 电源管理, DC/DC 转换器, SEPIC , Linear 公司的 LTCR3805- 5 是可调频率电流模式反激/升压/SEPIC DC/D C控制器,工作频率( 70kHz-700kHz )和斜率补偿由外接电阻编程,输出电压精度± % ,主要用在汽车电源,通信电源,隔离的电子设备,家用电器电源和 PoE 。本文介绍了 LTCR3805-5 主要特性,方框图,多种应用电路以及评估板电路图和材料清单。 Adjustable Frequency Current Mode Flyback/ Boost/SEPIC DC/DC Controller The LTCR3805-5 isa current mode DC/DC controller designed to drive an N-channel MOSFET in flyback, boost and SEPIC converter applications. Operating frequency and pensation can be programmed by external resistors. Programmable overcurrent sensing protects the converter from overload and short-circuit conditions. Soft-start can be programmed using an external capacitor and the soft-start capacitor also programs an automatic restart feature. The LTC3805-5 provides ± % output voltage accuracy and consumes only 360 μA of quiescent current during normal operation and only 40 μA during micropower startup. Using a internal shunt regulator, the LTC3805-5 can be powered from a high VIN through a resistor or it can be powered directly from a low impedance DC voltage from to . The LTC3805-5 is available in the 10-lead MSOP package and the 3mmx ? 3mm DFN package. LTCR3805-5 主要特性: VIN and VOUT Limited Only by ponents Undervoltage Lockout Threshold Adjustable pensation Adjustable Overcurrent Protection with Automatic Restart Adjustable Operating Frequency