介绍HIP2100的特性,并将其用于50W, 48V(输入)至5V(输出)的DC-DC变换器的设计;The most popular DC-DC converter topologies are also thesimplest - the flyback converter and the forward converter.Much of their simplicity is because they employ a single powertransistor referenced to the primary-side return. Though thesetopologies are straightforward, they do have some significantdrawbacks in many applications. In these situations, designersturn to more elegant topologies, such as the full-bridge andhalf-bridge converters. These topologies are complicatedmainly by having to drive multiple power transistors, where oneor more of the transistors is not referenced to the primary-sidereturn. These converters require either a pulse transformer oran IC driver that can level-shift the ground-referenced pulsewidthmodulator (PWM) signal to the half-bridge node.The Intersil HIP2100 driver IC simplifies the task of drivingtwo MOSFETs connected in a half-bridge configuration. Thissmall, fast, and low-cost driver is a better alternative to apulse transformer or other driver ICs for most applications(up to 100V) requiring both a low-side and a high-sidedriver [1]. It enables higher switching frequencies in isolatedDC-DC converters while maintaining high efficiency.This Application Note describes the design issuesassociated with a 50W two-switch forward converterfeaturing the HIP2100. This surface-mount DC/DC converteraccepts a 48VDC input and provides 5VDC output. The fullloadefficiency of the converter is 83% and the power densityis 11W/in3. The HIP2100’s fast propagation delay times and2A drive capability enables converter switching frequenciesof 500kHz or higher without an exotic resonant or resonanttransitiontopology. The two-switch forward converterreferenced design runs at 500kHz.
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