The LM5115 is a versatile switching regulator controller. It
has two main application configurations. The first is utilizing
the Secondary Side Post Regulation (SSPR) technique to
implement multiple output power converters. In the second
configuration, it can be used as a standalone synchronous
buck controller (Please see page 14 for more details). The
SSPR technique develops a highly efficient and well regulated
auxiliary output from the secondary side switching
waveform of an isolated power converter. Regulation of the
auxiliary output voltage is achieved by leading edge pulse
width modulation (PWM) of the main channel duty cycle.
Leading edge modulation is compatible with either current
mode or voltage mode control of the main output. The
LM5115 drives external high side and low side NMOS power
switches configured as a synchronous buck regulator. A
current sense amplifier provides overload protection and
operates over a wide common mode input range. Additional
features include a low dropout (LDO) bias regulator, error
amplifier, precision reference, adaptive dead time control of
the gate signals and thermal shutdown.