NCP1336BG SOP-13

NCP1336BG SOP-13

Mode Controller for High
Power Universal Off-Line
Supplies
NCP1336A/B
The NCP1336 hosts a high−performance circuitry aimed to
powering quasi−resonant converters. Capitalizing on a novel
valley−lockout system, the controller shifts gears and reduces the
switching frequency as the power loading becomes lighter. This
results in a stable operation despite switching events always occurring
in the drain−source valley. This system works down to the 4th valley
and toggles to a variable frequency mode beyond, ensuring an
excellent standby power performance.
The controller takes benefit of a high−voltage start−up current
source to provide a quick and lossless power−on sequence. To improve
the safety in overload situations, the controller includes an Over Power
Protection circuit which clamps the delivered power at high−line.
Safety−wise, an adjustable timer relies on the feedback voltage to
detect a fault. On version B, this fault triggers a triple−hiccup on the
VCC pin which naturally reduces the average input power drawn by
the converter. On version A, when a fault is detected, the controller is
latched−off.
Particularly well suited for adapter applications, the controller
features two latch inputs: one dedicated to Over Temperature
protection (OTP) which offers an easy means to connect a pull−down
temperature sensor like an NTC, and a second one more classical that
can be used to perform an accurate Over Voltage Protection.
Finally, a brownout pin which stops the circuit operation in presence
of a low mains condition is included.