1FEATURES
2• Self-synchronization to Main Channel Output
• Free-run Mode for Buck Regulation of DC
Input
• Leading Edge Pulse Width Modulation
• Voltage-mode Control with Current Injection
and Input Line Feed-forward
• Operates from AC or DC Input up to 42V
• Wide 4.5V to 30V Bias Supply Range
• Wide 0.75V to 13.5V Output Range.
• Top and Bottom Gate Drivers Sink 2.5A Peak
• Adaptive Gate Driver Dead-time Control
• Wide Bandwidth Error Amplifier (4MHz)
• Programmable Soft-start
• Thermal Shutdown Protection
• TSSOP-16 or Thermally Enhanced WSON-16
Packages

DESCRIPTION
The LM25115 controller contains all of the features
necessary to implement multiple output power
converters utilizing the Secondary Side Post
Regulation (SSPR) technique. 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 LM25115 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.