A 50W, 48V-to-5V DC-DC Converter Using the HIP2100

2009-5-12 11:20:59 3048

0 The most popular DC-DC converter topologies are also the simplest - the flyback converter and the forward converter. Much of their simplicity is because they employ a single power transistor referenced to the primary-side return. Though these topologies are straightforward, they do have some significant drawbacks in many applications. In these situations, designers turn to more elegant topologies, such as the full-bridge and half-bridge converters. These topologies are complicated mainly by having to drive multiple power transistors, where one or more of the transistors is not referenced to the primary-side return. These converters require either a pulse transformer or an IC driver that can level-shift the ground-referenced pulsewidth modulator (PWM) signal to the half-bridge node. The Intersil HIP2100 driver IC simplifies the task of driving two MOSFETs connected in a half-bridge configuration. This small, fast, and low-cost driver is a better alternative to a pulse transformer or other driver ICs for most applications (up to 100V) requiring both a low-side and a high-side driver [1]. It enables higher switching frequencies in isolated DC-DC converters while maintaining high efficiency. This Application Note describes the design issues associated with a 50W two-switch forward converter featuring the HIP2100. This surface-mount DC/DC converter accepts a 48VDC input and provides 5VDC output. The fullload efficiency of the converter is 83% and the power density is 11W/in3. The HIP2100’s fast propagation delay times and 2A drive capability enables converter switching frequencies of 500kHz or higher without an exotic resonant or resonanttransition topology. The two-switch forward converter referenced design runs at 500kHz. I5Tb4GhT.pdf (179.89 KB, 下载次数: 5 ) 0
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