UCC28221 - 具有可编程最大占空比的双路交错 PWM 控制器

UCC28221是TI德州仪器公司的一款PWM与谐振控制器产品，UCC28221是具有可编程最大占空比的双路交错 PWM 控制器，本站介绍了UCC28221的封装应用图解、特点和优点、功能等，并给出了与UCC28221相关的TI元器件型号供参考。

UCC28221 - 具有可编程最大占空比的双路交错 PWM 控制器 - PWM与谐振控制器 - 离线隔离型DC/DC控制器和转换器 - 德州仪器

产品描述

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.

UCC28220 has an UVLO turn-on threshold of 10 V for use in 12-V supplies while UCC28221 has a turn-on threshold of 13 V for systems needing wider UVLO hysteresis. Both have 8-V turn-off 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 startup 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.

产品特性

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 Under and Over-Voltage Sense with Programmable Hysteresis
Opto-Coupler Interface
110-V Internal Start-Up JFET (UCC28221)
Operates from 12-V Supply (UCC28220)
Programmable Soft-Start
APPLICATIONS
- High Output Current (50-A to 100-A) Converters
- Maximum Power Density Designs
- High Efficiency 48-V Input with Low Output Ripple Converters
- High Power Offline, Telecom and Datacom Power Supplies

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