NCP1240G: Controller, Fixed Frequency, Current Mode, Dual OCP for Flyback Converters

The NCP1240 is a new fixed−frequency current−mode controller featuring Dynamic Self−Supply. This 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 start-up, transients, latch, stand-by etc. This device contains a special HV detector which detects the application unplug from the ac input line and triggers the X2 discharge current. This HV structure allows the brown-out detection as well. It features a timer-based fault detection that ensures the detection of overload and an adjustable compensation to help keep the maximum power independent of the input voltage. 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 the robust power supply designs. A dedicated Off mode allows to reach the extremely low no load input power consumption via “sleeping” whole device and thus minimize the power consumption of the control circuitry. The NCP1240 differentiates itself from the rest of the fixed frequency flyback controllers with active X2 discharge and HV start up by implementing a Dual-Level Overcurrent protection. For some applications (e.g. limited power supplies), it is necessary that the controller maintains regulation while it has detected a first level of overload. This is to authorize a transient peak power higher than the maximum continuous output power. This product is IEC60950 compliant. Please see the test report and certification in the Conformance report section below.

Features
  • Frequency foldback and skip mode
  • Timer-based overload protection with latched (A version) or auto-recovery (B version) operation
  • High-voltage startup with dynamic self supply
  • Integrated brown-out detection
  • Frequency Modulation
  • Adjustable overpower protection
  • Timer based Dual-Level Overcurrent protection
Benefits
  • Optimized efficiency across the entire load range
  • Protection against overcurrent and short circuit
  • Simplifies the design of the auxiliary supply
  • Protects against any drops in line voltage
  • Softened EMI signature
  • Automatically adjusts the current limit depending on the line input voltage (high line or low line)
  • This is to authorize a transient peak power higher than the maximum continuous output power.
Applications
  • AC-DC Adapters
End Products
  • Notebook Computers
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
Fixed Frequency Current Mode Controller for Flyback ConvertersNCP1240G/D (1733kB)P0Jul, 2016
Package Drawings (1)
Document TitleDocument ID/SizeRevision
SOIC 7 CASE OUTLINE751U (62.0kB)E
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
NCP1240GD065R2GActivePb-free Halide freeSOIC-7751U1Tape and Reel2500$0.4961
Specifications
ProductTopologyControl Modefsw Typ (kHz)Stand-by ModeUVLO (V)Short Circuit ProtectionLatchSoft StartVCC Max (V)Drive Cap. (mA)
NCP1240GD065R2GFlybackCurrent Mode65Yes9.3YesYesYes28500 / 800
Fixed Frequency Current Mode Controller for Flyback Converters (1733kB) NCP1240G
SOIC 7 CASE OUTLINE NCL30060