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High−Voltage Switcher for Medium Power Offline SMPS
ON Semiconductor Corp
Description
The NCP1028 offers a new solution targeting output power levels from a few watts up to 15W 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 compensation offers superior performance in universal mains applications.Protection wise, a timer detects an overload or a short-circuit and stops all operations, ensuring a safe auto-recovery, low duty cycle burst operation. An integrated, auto-recovery.Finally, a great RDS(on) figure makes the circuit an excellent choice for standby/auxiliary offline power supplies or applications requiring higher output power levels.
Features
Skips cycles on low power demand Provides improved efficiency at light loads No acoustic noise Short circuit protection independent of the AUX winding Efficient protective circuitry Ease the design Overpower protection Effect of the input voltage variation on the max power delivered is compensated Built-in 700 V MOSFET with Typical RDS(on) of 5.8 , Tj = 25C Fixed Peak Current of 800 mA Internal Current Source for Clean and Lossless Startup Sequence Programmable Brown-Out Input for Low Input Voltage Detection Input to Permanently Latchoff the Part Internal Frequency Jittering for Improved EMI Signature No-Load Input Standby Power of 85 mW @ 265 Vac 500 mW Loaded, Input Power of 715 mW @ 230 Vac Programmable Over Power Protection Medium Power AC-DC power supply for CE apparatus
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