Linear LTCR3805-5 SEPIC DC电源转换解决方案

Linear 公司的LTCR3805-5是可调频率电流模式反激/升压/SEPIC DC/DC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±1.5%，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 is a current mode DC/DC controller designed to drive an N-channel MOSFET in flyback, boost and SEPIC converter applications. Operating frequency and slope compensation 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 ±1.5% output voltage accuracy and consumes only 360μA of quiescent current during normal operation and only 40μA during micropower startup. Using a 9.5V 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 4.7V to 8.8V.

The LTC3805-5 is available in the 10-lead MSOP package and the 3mmx3mm DFN package.

LTCR3805-5主要特性：..

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