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NCP1234 - Fixed Frequency Current Mode Controller

Description

Pin No Pin Name Function 1 LATCH Latch Off Input 2 FB 3 CS Feedback Current Sense 4 GND 5 DRV 6 VCC Drive output VCC input 8 HV High voltage pin Pin Description Pull the pin up or down to latch

off the controller.

Features

  • a timer.
  • based fault detection that ensures the detection of overload independently of an auxiliary winding, and an adjustable compensation to help keep the maximum power independent of the input voltage. Finally, due to a careful design, the precision of critical parameters is well controlled over the entire temperature range (.
  • 40°C to +125°C). Features.
  • Fixed.
  • Frequency Current.
  • Mode Operation with Built.
  • In Ramp 34Xff ALYWX G 1 34Xff = Specific De.

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Datasheet preview – NCP1234

Datasheet Details

Part number NCP1234
Manufacturer onsemi
File Size 227.25 KB
Description Fixed Frequency Current Mode Controller
Datasheet download datasheet NCP1234 Datasheet
Additional preview pages of the NCP1234 datasheet.

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Full PDF Text Transcription

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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.
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