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NCP1234

Part Number	NCP1234
Manufacturer	ON Semiconductor
Description	Fixed Frequency Current Mode Controller
Published	Nov 25, 2013
Detailed Description	NCP1234 Fixed Frequency Current Mode Controller for Flyback Converters The NCP1234 is a new fixed−frequency current−mo...
Datasheet	NCP1234 PDF File

Overview

NCP1234 Fixed Frequency Current Mode Controller for Flyback Converters The NCP1234 is a new fixed−frequency current−mode controller featuring Dynamic Self−Supply (DSS).
This device is pin−to−pin www.
onsemi.
com 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 SOIC−7 CASE 751U standby power consumption.
Internal frequency jittering, ramp compensation, and a versatile latch input...

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