一種低成本高電流的離線電源的設計方案

Design Engineers are constantly pushed to reduce the
space and cost of the power supply in their systems. For
supplies between 2W and 6W that can operate over the
world wide range of input voltage and frequency the options
were flyback switching power supply or a high voltage linear
regulator. The typical transformer supply requires AC
voltage sensing and active tap switching, which is not
common practice.
The flyback switching power supply is the most efficient, but
is costly, complex and requires special EMI filters for suppression.
The high voltage linear regulator is simple in
design, cheap, but not practical at this power level. The
transformer supply offers isolation and better efficiency but is
limited to a small range of input voltage and frequency, is
bulky, costly, and can be acoustically noisy.
An alternative solution is to configure the HV-2405E as a
control chip to drive a MOSFET. This solution is not as efficient
as the switching or transformer supplies and does not
provide isolation, but is a low cost, compact (no transformer)
2W to 6W power supply accepting the world wide range of
input voltage and frequency.