Linear LTC3856多相同步降压电源转换方案

Linear 公司的LTC3856是但输出双路多相同步降压DC/DC控制器,能驱动所有的N沟功率MOSFET,输入电压从4.5V到38V,基准电压0.6V,精度±0.75%,可锁相的固定频率从250kHz到770kHz,可编程的突发模式或级屏蔽,以获得轻负载的最大效率.效率高达95%.主要用在电信和数据通信,工业和医疗设备,DC电源分布系统和计算机系统.本文介绍了LTC3856主要特性, 方框图, 采用电阻和电感DCR检测电流的电路图,以及典型应用电路图和1.5V/50A转换器电路图.

The LTC®3856 is a single output, dual channel PolyPhase synchronous step-down DC/DC controller that drives all N-channel power MOSFET stages. This device includes a high speed differential amplifier for remote output volt­age sense. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase and up to 12-phase operation can be achieved.

The LTC3856 monitors the output current by sensing the voltage drop across the output inductor (DCR) or by using a sense resistor. DCR temperature compensation maintains an accurate current sense threshold over a broad temperature range. A constant-frequency, current mode architecture allows a phase-lockable frequency of up to 770kHz.
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