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/Title (NCP1235 - Fixed Frequency Current Mode Controller for Flyback Converters)
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NCP1235 - Fixed Frequency Current Mode Controller for Flyback Converters
ON Semiconductor
The NCP1235 is a new fixed−frequency current−mode controller
featuring Dynamic Self−Supply (DSS). This device is pin−to−pin
compatible with the previous NCP12xx families.
The DSS function greatly simplifies the design of the auxiliary
supply and the VCC capacitor by activating the internal startup current
source to supply the controller during transients.
Due to frequency foldback, the controller exhibits excellent
efficiency in light load condition while still achieving very low
standby power consumption. Internal frequency jittering, ramp
compensation, and a versatile latch input make this controller an
excellent candidate for converters where components cost is the key
constraints.
In addition, the controller includes a new high voltage circuitry that
combines a start−up current source and a brown−out detector able to
sense the input voltage either from the rectified ac line or the dc
filtered bulk voltage. The high voltage sensing circuitry is used for the
overpower protection purposes as well. Overpower protection,
overload protection, and next protective features increases safety level
of the final application.
Finally, due to a careful design, the precision of critical parameters
is well controlled over the entire temperature range (−40°C to
+125°C).
2015-01-14T09:38:09-07:00
BroadVision, Inc.
2020-11-10T14:46:14+01:00
2020-11-10T14:46:14+01:00
Acrobat Distiller 10.0.0 (Windows)
uuid:64486658-889d-469c-9668-34614c7834c6
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