TI LM5145100W高密度同步降压电源评估方案
TI公司的LM5145是42V同步降压控制器,其7.5V栅极驱动器能驱动外接高边和低边N沟功率开关,其自适应时间栅极驱动器能最小化开关瞬态时体二极管导通,从而降低开关损耗和提高了热效率,输入电压6V-42V,可调输出电压0.8V-40V,满足EN55022/CISPR 22 EMI标准,开关频率从100kHz到1MHz,主要用在通信设备,工厂自动化,马达控制和测试测量.本文介绍了LM5145主要特性,功能框图和几种应用电路,以及100W高密度评估板LM5145EVM-HD-20A特性和电性能,测试建立图,电路图,材料清单和PCB设计图.
The LM25145 42-V synchronous buck controller isdesigned to regulate from a high input voltage sourceor from an input rail subject to high voltage transients,minimizing the need for external surge suppressioncomponents. A high-side switch minimum on-time of40 ns facilitates large step-down ratios, enabling thedirect step-down conversion from a 24 V nominalinput to low-voltage rails for reduced systemcomplexity and solution cost. The LM25145 continuesto operate during input voltage dips as low as 6 V, atnearly 100% duty cycle if needed, making it wellsuited for high-performance industrial control, robotic,datacom, and RF power amplifier applications.
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