描述 Description

The MCP1012 is used as a primary-side start-up IC for startingan offline auxiliary switching supply working in conjunction with asecondary-side controller. The MCP1012 does not linearly regulate the power converter,but rather a secondary-side controller (digital and/or analog) accuratelylinear regulates using sophisticated adaptive control schemes that enhanceperformance and efficiency. The primary function of the MCP1012 are to provide startupof the flyback converter using an internal open-loop, peak current-mode currentregulator.? It does this by accepting PWMcommands via an isolation medium (s.a. a pulse transformer, opto, or other) froma secondary-side controller.? It integratesvarious protection features, including an undervoltage lockout (UVLO) and overvoltagelockout (OVLO) protection, and overtemperature protection (OTP.) ?Additionally, the MCP1012 provides peak cycle-by-cyclecurrent limiting both when under control of its internal current regulator or undercontrol of the secondary-side controller.

特性 Features

HV Startup 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 Startup Power
Able to Accept External PWM Commands from a Secondary Controller via Isolator (Various)
Undervoltage Lockout (UVLO) and Overvoltage Lockout (OVLO) Protections, Cycle-by-Cycle Current Limiting, Overtemperature Protection (Thermal Shutdown)
Sleep and Wake-up Commands, w/Low Standby Power (Package: 7-Lead SOIC

簡介

MCP1012屬于集成電路（IC）的ACDC轉換器離線開關。由制造生產的MCP1012AC DC 轉換器，離線開關該系列是元器件級控制產品，用于構建將交流市電轉換為直流電（通常電壓大幅降低）的設備。集成和未集成系統(tǒng)主要開關元件的器件均包括在內。由于高輸入輸出電壓比，以及此類系統(tǒng)中通常需要隔離，這些器件通常與外部變壓器配合使用。盡管通常使用定制變壓器來實現此用途，但也有許多專門用于此用途的庫存產品，請參見“開關轉換器，SMPS 變壓器”標題。