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.

• Transition Mode PFC Controller for Low Implementation Cost
• Industry Pin Compatibility With Improved Feature Set
• Improved Transient Response With Slew-Rate Comparator
• Zero Power Detect to Prevent Overvoltage Protection (OVP) During Light Load Conditions
• Accurate Internal VREF for Tight Output Regulation
• Two UVLO Options
• OVP, Open-Feedback Protection, and Enable Circuits
• ±750-mA Peak Gate Drive Current
• Low Start-Up and Operating Currents
• Lead (Pb)-Free Packages

• Topology
• Boost
• Control mode
• TM
• Practical operating frequency (Max) (MHz)
• 0.2
• UVLO thresholds on/off (V)
• 15.8/9.7
• Device type
• Controllers
• Operating supply current (mA)
• 4
• Features
• OVP, Peak Current Mode, Transition Control Mode
• Rating
• Catalog
• Operating temperature range (C)
• 0 to 70

UCC38050的完整型号有：UCC38050D、UCC38050DR、UCC38050P，以下是这些产品的关键参数及官网采购报价：

UCC38050D，工作温度：0 to 70，封装：SOIC (D)-8，包装数量MPQ：75个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网UCC38050D的批量USD价格：.266（1000+）

UCC38050DR，工作温度：0 to 70，封装：SOIC (D)-8，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网UCC38050DR的批量USD价格：.222（1000+）

UCC38050P，工作温度：0 to 70，封装：PDIP (P)-8，包装数量MPQ：50个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：NIPDAU，TI官网UCC38050P的批量USD价格：.3（1000+）

UCC28051EVM — UCC28051 评估模块

UCC28051 Evaluation Module is a 100-W offline AC-DC voltage converter with power factor correction (PFC). The power module was designed to show how the UCC28051 could be configured in an off-line power factor corrected preregulator. The module was designed to operate over a universal input range (...)

UCC38050-CALC — 用于 UCC38050 转换模式 PFC 控制器的 MathCAD 计算工具

MathCAD application design tool for use with the UCC38050.