onsemi NCP1075, 76-77-79 A & B

Available in two different pin-out flavors of the very common PDIP 7 package, the devices offer a high level of integration, including soft start, frequency jittering, short circuit protection, skip cycle, a maximum peak current set point, ramp compensation, and a dynamic self supply (DSS, eliminating the need for an auxiliary winding).Unlike other monolithic solutions, the NCP1077-76-77-79 A & B is quiet by nature: during nominal load operation, the part switches at one of the available frequencies (65 or 100 kHz).

Key features

• Built−in 700 V MOSFET
• Current−mode fixed frequency operation – 65 / 100 kHz
• Fixed slope compensation
• Auto−recovery output short

Additional features

• Built−in 700 V MOSFET with RDS(ON) of 13.5 Ω (NCP1075), 4.8 Ω (NCP1076/77) and 2.9 Ω (NCP1079)
• Large creepage distance between high voltage pins
• Current−mode fixed frequency operation – 65 / 100 kHz
• Fixed slope compensation
• Skip−cycle operation at low peak currents only
• Dynamic Self−Supply: no need for an auxiliary winding
• Internal 10 ms soft−start
• Auto−recovery output short−circuit protection with timer−based detection
• Auto−recovery over−voltage Protection with auxiliary winding operation
• Adjustable brown−out protection and OVP
• 2nd leading edge blanking – current protection
• Over Power Protection
• Frequency jittering for better EMI signature
• No load input consumption < 50 mW
• Frequency foldback to improve efficiency at light load
• These are Pb−free devices

Applications

• Auxiliary & Standby Power Supply
• Major Home Appliances power supplies
• Low to medium Power Chargers & Adapters
• White Goods
• E-Meters
• Industrial
• Consumer Equipment Power Supply