NCP1240 Description
NCP1240 Fixed Frequency Current Mode Controller for Flyback Converters The NCP1240 is a new fixed−frequency current−mode controller featuring the 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...
NCP1240 Key Features
- Fixed-Frequency Current-Mode Operation (65 kHz and 100 kHz
- Timer-Based Overload Protection with Latched (Options A and E) or
- High-voltage Current Source with Brown-Out Detection and
- Frequency Modulation for Softened EMI Signature
- Adjustable Overpower Protection Dependant on the Bulk Voltage
- Latch-off Input bined with the Overpower Protection Sensing
- VCC Operation up to 28 V, With Overvoltage Detection
- 500/800 mA Source/Sink Drive Peak Current
- 10 ms Soft-Start
- Internal Thermal Shutdown
NCP1240 Applications
- AC−DC Adapters for Notebooks, LCD, and Printers