介绍HIP2100的特性,并将其用于50W, 48V(输入)

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 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.