NCP1028 Overview
NCP1028 High-Voltage Switcher for Medium Power Offline SMPS Featuring Low The NCP1028 offers a new solution targeting output power levels from a few watts up to 15 W in a universal mains flyback application. Our proprietary high−voltage technology lets us include a power MOSFET together with a startup current source, all directly connected to the bulk capacitor. To prevent lethal runaway in low input voltage conditions, an adjustable brown−out circuitry blocks the activity until sufficient input level is reached. Current−mode operation together with an adjustable ramp pensation offers superior performance in universal mains applications. Furthermore, an Over Power Protection pin brings the ability to precisely pensate all internal delays in high input voltage conditions and optimize the maximum output current capability. Protection wise, a timer detects an overload or a short−circuit...
NCP1028 Key Features
- Built-in 700 V MOSFET with Typical RDS(on) of 5.8 W, TJ = 25°C
- Current-Mode Fixed Frequency Operation: 65 kHz and 100 kHz
- Fixed Peak Current of 800 mA
- Skip-Cycle Operation at Low Peak Currents
- Internal Current Source for Clean and Lossless Startup Sequence
- Auto-Recovery Output Short Circuit Protection with Timer-Based
- Programmable Brown-Out Input for Low Input Voltage Detection
- Programmable Over Power Protection
- Input to Permanently Latchoff the Part
- Internal Frequency Jittering for Improved EMI Signature
NCP1028 Applications
- Built−in 700 V MOSFET with Typical RDS(on) of 5.8 W, TJ = 25°C