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/Title (NCP1249 - High-Voltage Current-Mode PWM Controller Featuring Peak Power Excursion and Extremely Low Stand-by Power Consumption)
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Acrobat Distiller 10.0.0 (Windows)
BroadVision, Inc.
2020-10-12T10:07:30+02:00
2015-05-15T14:50:33-07:00
2020-10-12T10:07:30+02:00
application/pdf
NCP1249 - High-Voltage Current-Mode PWM Controller Featuring Peak Power Excursion and Extremely Low Stand-by Power Consumption
ON Semiconductor
The NCP1249 is a highly integrated high−voltage PWM controller
capable of delivering a rugged and high performance offline power
supply with extremely low no−load consumption. With a supply range
up to 30 V, the controller hosts a jittered 65−kHz switching circuitry
operated in peak current mode control. When the power on the
secondary side starts to decrease, the controller automatically folds
back its switching frequency down to a minimum level of 26 kHz. As
the power further goes down, the part enters skip cycle while freezing
the peak current setpoint.
To help build rugged converters, the controller features several key
protective features: a internal brown−out, a non−dissipative Over
Power Protection for a constant maximum output current regardless of
the input voltage and two latched over voltage protection inputs −
either through a dedicated pin or via the VCC input.
The controller architecture is arranged to authorize a transient peak
power excursion when the peak current hits the limit. At this point, the
switching frequency is increased from 65 kHz to 130 kHz until the
peak requirement disappears. The timer duration is then modulated as
the converter crosses a peak power excursion mode (long) or
undergoes a short circuit (short).
NCP1249 comes in both Active ON (A and B versions) and Active
OFF (C and D versions).
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