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/Title (NCP1239 - Fixed Frequency Current-Mode Controller for Flyback Converter)
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2023-09-01T10:43:19-07:00
BroadVision, Inc.
2023-09-01T10:52:01-07:00
2023-09-01T10:52:01-07:00
Acrobat Distiller 23.0 (Windows)
application/pdf
NCP1239 - Fixed Frequency Current-Mode Controller for Flyback Converter
onsemi
The NCP1239 is a fixed-frequency current-mode controller
featuring a high-voltage start-up current source to provide a quick and
lossless power-on sequence. This function greatly simplifies the
design of the auxiliary supply and the VCC capacitor by activating the
internal start-up current source to supply the controller during start-up,
transients, latch, stand-by etc.
With a supply range up to 35 V, the controller hosts a jittered 65 or
100-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 minimum
level of 26 kHz. As the power further goes down, the part enters skip
cycle while limiting the peak current that insures excellent efficiency
in light load condition.
NCP1239 features a timer-based fault detection circuitry that
ensures a quasi-flat overload detection, independent of the input
voltage.
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