Maxim MAX17558 60V双输出同步降压转换方案
Maxim公司的MAX17558是60V双输出同步降压控制器,驱动N-MOSFET,采用峰值电流模式,恒频架构,工作频率高达2.2MHz,可配置两路单相输出,每路10A,或配置双路单输出20A,工作温度-40℃到+125℃,输入电压4.5V 到 60V,输出电压0.8V到24V,主要用在工业电源,分布DC电源,运动控制,PLC和计算数字控制.本文介绍了MAX17558优势和主要特性,框图,几种应用电路以及MAX17558双相评估板主要特性,电路图,材料清单和PCB设计图.
The MAX17558 is a dual-output, synchronous step-down controller that drives nMOSFETs.
The device features a peak-current-mode, constant-frequency architecture, allowing it to operate up to 2.2MHz. The device can be configured as two single-phase, independent 10A power supplies or as a dual-phase, single-output 20A power supply. The device also provides the ability to run two controllers 180° out-of-phase to reduce the power loss and noise due to the input-capacitor ESR.
The IC supports current sensing using either an external current-sense resistor for accuracy or an inductor DCR for improved system efficiency. Current foldback limits MOSFET power dissipation under short-circuit conditions.
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