[原创]ADI LT8357 60V 2MHz低IQ SEPIC,升压和反激转换器解决方案

ADI公司的LT8357是宽输入电流模式DC/DC控制器,可以配置成升压,SEPIC或反激转换器.LT8357驱动带有5V分立栅极驱动的低边功率MOSFET.电流模式架构允许可调和100kHz到2MHz同步固定频率工作,或内部19%三角扩频操作以获得低的EMI.在轻负载时可选择脉冲跳跃模式或波纹突发模式.其它特性还包括在SEPIC和反激配置时的输出电源良好和输出短路保护.器件低IQ突发模式工作电流为8μA,2MHz时的效率高达95%,内部有±1.5% 1V电压基准,5V分立栅极驱动提高了效率和优化EMI,100kHz到2MHz固定开关频率和外接时钟同步,可编输出软起动和跟踪,采用热增强的12引脚MSOP封装.主要用在汽车和工业系统,电池供电的系统,可提电子设备.本文介绍了LT8357主要特性和框图,简化反激转换器图和简化SEPIC转换器图以及多种应用电路图,演示板DC2937A主要特性和性能,测试程序建立图和电路图以及材料清单.

The LT®8357 is a wide input range, current mode, DC/DC controller which can be configured as a boost, SEPIC or flyback converter. The LT8357 drives a low side N-channel power MOSFET with 5V split gate drive. The current mode architecture allows adjustable and synchronizable100kHz to 2MHz fixed frequency operation, or internal 19% trian­gle spread spectrum operation for low EMI. At light load, either pulse-skipping mode or low-ripple Burst Mode operation can be selected. Additional features include output power good and output short circuit protection in SEPIC and flyback configurations.

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