LM5007,pdf datasheet (High Vol

The LM5007 Step Down Switching Regulator features all of
the functions needed to implement low cost, efficient, Buck
bias regulators. This high voltage regulator contains an 80 V,
0.7A N-Channel Buck Switch. The device is easy to apply and
is provided in the MSOP-8 and the thermally enhanced LLP-8
packages. The regulator is based on a hysteretic control
scheme using an on time inversely proportional to VIN. This
feature allows the operating frequency to remain relatively
constant with load and input voltage variations. The hysteretic
control requires no control loop compensation, while providing
very fast load transient response. An intelligent current
limit is implemented in the LM5007 with forced off time that is
inversely proportional to VOUT. This current limiting scheme
reduces load current foldback. Additional protection features
include: Thermal Shutdown, Vcc undervoltage lockout, gate
drive undervoltage lockout, and Max Duty Cycle limiter.