基于UCC28070的300W PFC高效電源方案設(shè)計
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本文介紹了UCC28070 主要特性，簡化方框圖和功能方框圖，以及采用兩個UCC28070的四相輸出應(yīng)用框圖，300W交叉PFC預(yù)穩(wěn)壓器參考設(shè)計主要指標(biāo)，控制器電路圖和電源電路圖。
本文引用地址：http://www.antipu.com.cn/article/176473.htmUCC28070是先進(jìn)的功率因素修正器件，集成了兩個工作在180度反相的PWM。 這種PWM交叉工作能降低輸入和輸出紋波電流，使得導(dǎo)電EMI濾波變得更加容易，成本更低?？删幊坦ぷ黝l率從30 kHz 到300 kHz，有極好的效率和多種保護(hù)功能，主要用在高效服務(wù)器和臺式PC電源，通信整流器，白色家電和工業(yè)設(shè)備。
UCC28070 主要特性：
Interleaved Average Current-Mode PWM Control
with Inherent Current Matching
Advanced Current Synthesizer Current Sensing for
Superior Efficiency
Highly-Linear Multiplier Output with Internal Quantized
Voltage Feed-Forward Correction for Near-Unity PF
Programmable Frequency (30 kHz to 300 kHz)
Programmable Maximum Duty-Cycle Clamp
Programmable Frequency Dithering Rate and Magnitude
for Enhanced EMI Reduction
Magnitude: 3 kHz to 30 kHz
Rate: Up to 30 kHz
External Clock Synchronization Capability
Enhanced Load and Line Transient Response through Voltage
Amplifier Output Slew-Rate Correction
Programmable Peak Current Limiting
Bias-Supply UVLO, Over-Voltage Protection, Open-Loop Detection,
and PFC-Enable Monitoring
External PFC-Disable Interface
Open-Circuit Protection on VSENSE and VINAC pins
Programmable Soft Start
20-Lead TSSOP/SOIC Packages
UCC28070 應(yīng)用：
High-Efficiency Server and Desktop Power Supplies
Telecom Rectifiers
White Goods and Industrial Equipment
圖1。UCC28070簡化方框圖
圖2。UCC28070功能方框圖
圖3。采用兩個UCC28070的四相輸出應(yīng)用框圖
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