NCP1248 Description
NCP1248 Fixed Frequency Current Mode Controller for Flyback Converters The NCP1248 is a new fixed-frequency current-mode controller featuring the Dynamic Self-Supply. This function greatly simplifies http://onsemi. 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.
NCP1248 Key Features
- Fixed-Frequency Current-Mode Operation using 65 kHz/100 kHz
- Frequency Foldback then Skip Mode for Maximized Performance
- Timer-Based Overload Protection with Latched (Option A)
- 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
- VCC Operation up to 28 V, With Overvoltage Detection
- 500/800 mA Source/Sink Drive Peak Current Capability