Transcription of NCP1239 - Fixed Frequency Current-Mode Controller for ...
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NCP1239 - Fixed Frequency Current-Mode Controller for ...
Semiconductor Components Industries, LLC, 2016 October, 2020 Rev. 251 publication Order NumberNCP1239/D Fixed FrequencyCurrent Mode Controller forFlyback ConverterNCP1239 The NCP1239 is a Fixed - Frequency Current-Mode controllerfeaturing a high-voltage start-up current source to provide a quick andlossless power-on sequence. This function greatly simplifies thedesign of the auxiliary supply and the VCC capacitor by activating theinternal start-up current source to supply the Controller during start-up,transients, latch, stand-by a supply range up to 35 V, the Controller hosts a jittered 65 or100-kHz switching circuitry operated in peak current mode the power on the secondary side starts to decrease, the controllerautomatically folds back its switching Frequency down to minimumlevel of 26 kHz.
1 Publication Order Number NCP1239/D Fixed Frequency Current‐Mode Controller for Flyback Converter NCP1239 ... 128 ms 25.5 V Latch Latch 101 / 95 272 ms 4 ms Disable ... Charged-Device Model ESD Capability per JEDEC JESD22−C101E 1 kV
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