The UCC28220 and UCC28221 are a family of BiCMOS interleaved dual channel PWM controllers. Peak current mode control is used to ensure current sharing between the two channels. A precise maximum duty cycle clamp can be set to any value between 60% and 90% duty cycle per channel.

The UCC28220 has an UVLO turnon threshold of
10 V for use in 12-V supplies while UCC28221 has a turnon threshold of 13 V for systems needing wider UVLO hysteresis. Both have 8-V turnoff thresholds.

Additional features include a programmable internal slope compensation with a special circuit which is used to ensure exactly the same slope is added to each channel and a high-voltage 110-V internal JFET for easier start-up for the wider hysteresis UCC28221 version.

The UCC28220 is available in both 16-pin SOIC and low-profile TSSOP packages. The UCC28221 also comes in 16-pin SOIC package and a slightly larger 20-pin TSSOP package to allow for high-voltage pin spacing to meet UL1950 creepage clearance safety requirements.

• 2-MHz High-Frequency Oscillator With 1-MHz Operation Per Channel
• Matched Internal Slope Compensation Circuits
• Programmable Maximum Duty Cycle Clamp 60% to 90% Per Channel
• Peak Current Mode Control With Cycle-by-Cycle Current Limit
• Current Sense Discharge Transistor for Improved Noise Immunity
• Accurate Line Undervoltage and Overvoltage Sense With Programmable Hysteresis
• Opto-Coupler Interface
• 110-V Internal Start-Up JFET (UCC28221)
• Operates From 12-V Supply (UCC28220)
• Programmable Soft Start

• Topology
• Flyback, Forward
• Duty cycle (Max) (%)
• 90
• Supply voltage (Max) (V)
• 14.5
• UVLO thresholds on/off (V)
• 13.0/8.0
• Features
• Adjustable Switching Frequency, Current Limiting, HV Start-up, Input Line Monitor, Multi-topology, Programmable Max Duty Cycle, Programmable Slope Compensation, Soft Start
• Operating temperature range (C)
• -40 to 105
• Rating
• Catalog
• Frequency (Max) (kHz)
• 2000
• Gate drive (Typ) (A)
• 0.01

UCC28221的完整型号有：UCC28221D、UCC28221PW，以下是这些产品的关键参数及官网采购报价：

UCC28221D，工作温度：-40 to 105，封装：SOIC (D)-16，包装数量MPQ：40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UCC28221D的批量USD价格：2.218（1000+）

UCC28221PW，工作温度：-40 to 105，封装：TSSOP (PW)-20，包装数量MPQ：70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UCC28221PW的批量USD价格：2.218（1000+）

UCC28221-CALC UCC28221 MathCAD 计算实用程序

This Mathcad design tool was developed to use with the UCC28221 application note SLUA312.