TI UCC28180 3.5-kW PFC效率大于98%参考设计

TI公司的ucc28180是可编频率（18 kHz到250 kHz）连续导电模式（CCM）功率因速修正（PFC）控制器，8引脚封装，通用AC输入，工作在100W 到几kW范围，主要用在服务器和台式计算机电源，白色家电（空调器，冰箱），工业电源和平板（PDP，LCD和LED）TV等。本文介绍了UCC28180主要特性，功能框图，典型应用电路图以及230-V， 3.5-kW PFC效率大于98%参考设计TIDA-00779主要特性，系统指标，电路图和材料清单。

The UCC28180 is a flexible and easy-to-use， 8-pin，active Power-Factor Correction （PFC） controller thatoperates under Continuous Conduction Mode （CCM）to achieve high Power Factor， low current distortionand excellent voltage regulation of boost preregulatorsin AC - DC front-ends. The controller issuitable for universal AC input systems operating in100-W to few-kW range with the switching frequencyprogrammable between 18 kHz to 250 kHz， toconveniently support both power MOSFET and IGBTswitches. An integrated 1.5-A and 2-A （SRC-SNK）peak gate drive output， clamped internally at 15.2 V（typical）， enables fast turn-on， turn-off， and easymanagement of the external power switch without theneed for buffer circuits.

Low-distortion wave shaping of the input currentusing average current mode control is achievedwithout input line sensing， reducing the externalcomponent count. In addition， the controller featuresreduced current sense thresholds to facilitate the useof small-value shunt resistors for reduced powerdissipation， especially important in high-powersystems. To enable low current distortion， thecontroller also features trimmed internal current loop regulation circuits for eliminating associatedinaccuracies.

Simple external networks allow for flexible compensation of the current and voltage control loops. In addition，UCC28180 offers an enhanced dynamic response circuit that is based on the voltage feedback signal to deliverimproved response under fast load transients， both for output overvoltage and undervoltage conditions. Anunique VCOMP discharge circuit provided in UCC28180 is activated whenever the voltage feedback signalexceeds VOVP_L thus allowing a chance for the control loop to stabilize quickly and avoid encountering theovervoltage protection function when PWM shutoff can often cause audible noise. Controlled soft start graduallyregulates the input current during start-up and reduces stress on the power switches. Numerous system-levelprotection features available in the controller include VCC UVLO， peak current limit， soft overcurrent， outputopen-loop detection， output overvoltage protection and open-pin detection （VISNS）。 A trimmed internal referenceprovides accurate protection thresholds and regulation set-point. The user can control low-power standby modeby pulling the VSENSE pin below 0.82 V.

UCC28180主要特性：

1• 8-Pin Solution （No AC Line Sensing Needed）

• Wide Range Programmable Switching Frequency（18 kHz to 250 kHz for MOSFET and IGBT-basedPFC Converters）

• Trimmed Current Loop Circuits for Low iTHD

• Reduced Current Sense Threshold （MinimizesPower Dissipation in Shunt）

• Average Current-Mode Control

• Soft Over Current and Cycle-by-Cycle PeakCurrent Limit Protection

• Output Overvoltage Protection With HysteresisRecovery

• Audible Noise Minimization Circuitry

• Open Loop Detection

• Enhance Dynamic Response During OutputOvervoltage and Undervoltage Conditions

• Maximum Duty Cycle of 96% （Typical）

• Burst Mode for No Load Regulation

• VCC UVLO， Low ICC Start-Up （《 75 μA）

UCC28180应用：

• Universal AC Input， CCM Boost PFC Convertersin 100-W to Few-kW Range

• Server and Desktop Power Supplies

• White Good Appliances （Air Conditioners，Refrigerators）

• Industrial Power Supplies （DIN Rail）

• Flat Panel （PDP， LCD， and LED） TVs

图1.UCC28180功能框图

图2.UCC28180典型应用电路图

图3.UCC28180设计案例电路图

230-V， 3.5-kW PFC效率大于98%参考设计TIDA-00779

230-V， 3.5-kW PFC With 》98% Efficiency， Optimized for BOM and Size Reference Design

This reference design is a 3.5-kW， cost competitivePFC designed for room air conditioners and othermajor appliances. This reference design is acontinuous-conduction-mode （CCM） boost converterimplemented using TI’s UCC28180 PFC controllerprovided with all of the necessary built-in protections.

The hardware is designed and tested to pass surgeand EFT testing as per the IEC 61000 requirementsfor household appliances.

The key highlights of this reference design are：

• Provides a ready platform for front-end PFCs toaddress power level requirements for appliancesup to 3.5 kW

• Up to 98.6% peak converter efficiency under 230-Vinput enable a competitive high power density andsmall heat sink design

• Robust output supply protected for outputovercurrent， output overvoltage， and output

undervoltage conditions

参考设计TIDA-00779主要特性：

• High Efficiency of 》 98% Over Entire OperatingVoltage Range， Allowing a Smaller Heat Sink

• Wide Full Load Operating Input Range of 190-V to270-V AC

• High Power Factor 》 0.99 and 《 5% THD FromMedium-to-Full Load （50 to 100%）

• Up to 3.5-kW High Power Output to Cover Most ofSingle-Phase Input PFC Application

• 8-Pin PFC Solution （No AC Line Sensing Needed）Enable Very Simple Design

• Reduced Current Sense Threshold MinimizesPower Dissipation

• High Power Density for Smaller Dimension

• Robust Output Supply Protected for OutputOvercurrent， Output Overvoltage， and OutputUndervoltage Conditions

• Meets Requirements of EFT Norm IEC 6000-4-4and Surge Norm IEC 61000-4-5

• Simple Use PCB Form Factor （215 × 145 mm）

参考设计TIDA-00779应用：

• Room Air Conditioners

• Industrial AC/DC 》 480 W

• Single-Phase UPS

• Other Major Appliances

图4.参考设计TIDA-00779外形图

参考设计TIDA-00779系统指标：

图5.PFC调节器框图

图6.参考设计TIDA-00779电路图

参考设计TIDA-00779材料清单：