Onsemi NCP1050

Description

The NCP1050 through NCP1055 are monolithic high voltageregulators that enable end product equipment to be compliant with lowstandby power requirements. This device series combines the requiredconverter functions allowing a simple and economical power systemsolution for office automation, consumer, and industrial products.These devices are designed to operate directly from a rectified AC linesource. In flyback converter applications they are capable of providingan output power that ranges from 6.0 W to 40 W with a fixed AC inputof 100 V, 115 V, or 230 V, and 3.0 W to 20 W with a variable AC inputthat ranges from 85 V to 265 V.This device series features an active startup regulator circuit thateliminates the need for an auxiliary bias winding on the convertertransformer, fault detector and a programmable timer for converteroverload protection, unique gated oscillator configuration for extremelyfast loop response with double pulse suppression, power switch currentlimiting, input undervoltage lockout with hysteresis, thermal shutdown,and auto restart fault detection. These devices are available ineconomical 8−pin dual−in−line and 4−pin SOT−223 packages.

Features

• Startup Circuit Eliminates the Need for Transformer Auxiliary BiasWinding
• Optional Auxiliary Bias Winding Override for Lowest StandbyPower Applications
• Converter Output Overload and Open Loop Protection
• Auto Restart Fault Protection
• IC Thermal Fault Protection
• Unique, Dual Edge, Gated Oscillator Configuration for Extremely Fast Loop Response
• Oscillator Frequency Dithering with Controlled Slew Rate Driver for Reduced EMI
• Low Power Consumption Allowing European Blue Angel Compliance
• On−Chip 700 V Power SwitchCircuit and Active Startup Circuit
• Rectified AC Line Source Operation from 85 V to 265 V
• Input Undervoltage Lockout with Hysteresis
• Oscillator Frequency Options of 44 kHz, 100 kHz, 136 kHz
• These are Pb−Free and Halide−Free Devices

Typical applications

• AC−DC Converters
• Portable Electronic Chargers
• Low Power Standby and Keep−Alive Supplies
• Wall Adapters

More information

• Datasheet
• IC product information