ADI ADP1874电流模式12A降压电源控制方案

ADI 公司的ADP1874/ADP1875是电流模式同步降压电源控制器，提供优异的瞬态响应，最佳的稳定性和限流保护，输入电压2.95V-20V，输出电压最低可达0.6V，开关频率有300 kHz, 600 kHz和1.0 MHz三种选择，不需要电流检测电阻，主要用在通信和网络系统，中高端服务器，STB和DSP核电源。本文介绍了ADP1874/ADP1875主要特性，方框图以及多种12A输出电流应用电路图，大电流评估板电路图和布局图。

The ADP1874/ADP1875 are versatile current mode, synchronous step-down controllers. They provide superior transient response, optimal stability, and current-limit protection by using a constant on-time, pseudo fixed frequency with a programmable current limit, current control scheme. In addition, these devices offer optimum performance at low duty cycles by using a valley, current mode control architecture. This allows the ADP1874/ADP1875 to drive all N-channel power stages to regulate output voltages to as low as 0.6 V.

The ADP1875 is the power saving mode (PSM) version of the device and is capable of pulse skipping to maintain output regulation while achieving improved system efficiency at light loads (see the ADP1875 Power Saving Mode (PSM) section for more information).
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