Techniques are disclosed to extend an on time period of switch to regulate
a transfer of energy from an input of a power supply to an output of a
power supply. One example integrated circuit includes an energy transfer
element coupled between an input and an output of the power supply. A
switch is coupled to the input of the energy transfer element. A
controller is coupled to the switch to control switching of the switch to
regulate a transfer of energy from the input of the power supply to the
output of the power supply in response to a feedback signal received from
the output of the power supply. The controller is coupled to limit a
maximum on time period of the switch a first maximum on time period in
response to a first range of power supply operating conditions and to a
second maximum on time period for a second range of power supply
operating conditions.