UCC38051中文资料符合 IEC61000-3-2 标准、温度范围为 0°C 至 70°C、具有 12.5V/9.7V UVLO 的转换模式 PFC 控制器数据手册TI规格书

描述 Description

The UCC38050 and UCC38051 are PFC controllers for low-to-medium power applications requiring compliance with IEC 1000-3-2 harmonic reduction standard. The controllers are designed for a boost preregulator operating in transition mode (also referred to as boundary-conduction mode or critical conduction-mode operation). They feature a transconductance voltage amplifier for feedback error processing, a simple multiplier for generating a current command proportional to the input voltage, a current-sense (PWM) comparator, PWM logic, and a totem-pole driver for driving an external FET. In the transition mode operation, the PWM circuit is self-oscillating, with the turnon being governed by an inductor zero-current detector (ZCD pin), and the turnoff being governed by the current-sense comparator. Additionally, the controller provides features such as peak current limit, default timer, overvoltage protection (OVP) and enable.

特性 Features

• Transition Mode PFC Controller for Low Implementation Cost
• Improved Transient Response With Slew-Rate Comparator
• Accurate Internal VREF for Tight Output Regulation
• OVP, Open-Feedback Protection, and Enable Circuits
• Low Start-Up and Operating Currents
• Lead (Pb)-Free Packages