Microchip, AC-DC Converter 3A 7-Pin, 7/SOIC MCP1012-V/EKA

The Microchip MCP1012 is used as a primary-side start-up IC for starting an offline auxiliary switching supply working in conjunction with a secondary-side controller. The MCP1012 does not linearly regulate the power converter, but rather a secondary-side controller (digital and/or analogue) accurately linear regulates using sophisticated adaptive control schemes that enhance performance and efficiency.

HV Start-up Capability (500V Continuous, 700V Transient w/series 10K Resistor)
Internal Open-Loop, Peak Current-Mode (PCM) Current Regulator for Start-up (w/Few External Components) w/Integrated Robust Gate Driver
Current Regulator (Constant Off Time, 21us)
Protection Against Continuous Conduction Mode (CCM) of Operation
Programmable Low-Frequency Oscillator (LFO) Period to Set Start-up Power