满负荷效率高达的控制专项方案.doc

TI UCC28180满负荷效率高达95%PFC控制方案
核心词：电源管理,AC/DV转换器,PFC,UCC28180
TI公司UCC28180是工作在持续导通模式(CCM)PFC控制器,可得到高电源效率,低电流失真和极好电压调节,非常适合于100瓦到几千瓦AC/DC转换器,开关频率从18kHz到250kHz,支持功率MOSFET和IGBT开关,重要用在服务器和台式电源,白色家电,工业电源和平板电视如PDP,LCD和LED TV．本文简介了UCC28180重要特性，框图,以及360W评估板UCC28180EVM-573重要特性,电路图,测试连接图,材料厂清单和PCB元件布局图.　

The UCC28180 is a flexible and easy-to-use，8-pin，active Power Factor Correction (PFC) controller that operates under Continuous Conduction Mode (CCM) to achieve high Power Factor，low current distortion and excellent voltage regulation of boost pre-regulators in AC - DC front-ends. The controller is suitable for universal AC input systems operating in 100-W to few-kW range with the switching frequency programmable between 18 kHz to 250 kHz，to conveniently support both power MOSFET and IGBT switches. 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 easy management of the external power switch without the need for buffer circuits.

Low-distortion wave shaping of the input current using average current mode control is achieved without input line sensing，reducing the external component count. In addition，the controller features reduced current sense thresholds to facilitate the use of small value shunt resistors for reduced power dissipation，especially important in high power systems. To enable low current distortion，the controller also features trimmed internal current loop regulation circuits for eliminating associated inaccuracies.

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 deliver improved response under fast load transients，both for output over-voltage and under-voltage conditions. An unique VCOMP discharge circuit provided in UCC28180 is activated whenever the voltage feedback signal exceeds VOVP_L thus allowing a chance for the control loop to stabilize quickly and avoid encountering the over-voltage protection function when PWM shut-off can often cause audible noise. Controlled soft start gradually regulates the input current during start-up and reduces stress on the power switches. Numerous system-level protection features available in the controller include VCC UVLO，peak current limit，soft over-current，output open-loop detection，output over-voltage protection and open-pin detection (VISNS). A trimmed internal reference provides accurate protection thresholds and regulation set-point. The user can control low power standby mode by pulling the VSENSE pin below 0.82 V. 

UCC28180重要特性:

8-pin Solution (no AC line sensing needed)
Wide Range Programmable Switching Frequency (18 kHz to 250 kHz for MOSFET and IGBT based PFC converters)
Trimmed Current Loop Circuits for Low iTHD
Reduced Current Sense Threshold (minimizes power dissipation in shunt)
Average Current-Mode Control
Soft Over Current and Cycle-by-Cycle Peak Current Limit Protection 
Output Over-Voltage Protection with Hysteresis Recovery
Audible Noise Minimization Circuitry
Open Loop Detection 
Enhance Dynamic Response During Output Over and Under-Voltage 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
converters in 100-W to Few-kW range
Server and Desktop Power Supplies
White Good Appliances (Air Conditioners,Refrigerators)
Industrial Power Supplies (DIN Rail)
Flat Panel TV (PDP，LCD and LED) TVs

图1. UCC28180框图

360W评估板UCC28180EVM-573

The UCC28180EVM-573 evaluation module (EVM) is a 360-W off-line power factor correction (PFC) boost converter providing a nominal output voltage of 390-V regulated output at 0.923 A of load current. The PFC converter accommodates an input voltage range of 85 VAC to 265 VAC and uses average current mode control at a fixed programmable switching frequency of 120 kHz. The UCC28180 incorporates a wide range of protection features to ensure safe system operation.

The UCC28180EVM-573 highlights the many benefits of using the UCC28180 Continuous Current Mode Boost PFC Controller (TI Literature Number SLUSBQ5). The controller operates under average current mode control at a fixed programmable switching frequency of 120 kHz. Simple external current and voltage loop compensation，along with advanced protection features，make this controller ideal for server and desktop power supplies，industrial power supplies，and white goods.

This user’s guide provides the schematic，component list，assembly drawing for a single-sided printed circuit board application，and test set up necessary to evaluate the UCC28180 in a typical PFC application.

The UCC28180EVM-573 is suited for use in high-power off-line systems that require high-efficiency and advanced fault protection features，applications including，but not limited to:

• Server and Desktop Power Supplies
• Industrial Power Supplies (DIN Rail)
• White Goods
– A/C Units
– Refrigerators
– etc.

评估板UCC28180EVM-573重要特性:

• AC Input Range 85 VAC to 265 VAC
• 360-W，390-V Output
• Average Current Mode PWM Control
• No AC Line Sensing Needed
• Fixed 120-kHz Oscillator frequency，Programmable With a Single External Resistor
• Soft Over Current and Cycle-by-Cycle Peak Current Limiting
• VCC Under Voltage Lockout With Low Start-Up Current
• Voltage Regulation Open Loop Detection
• Output Over-Voltage Protection With Hysteresis Recovery
• Enhanced Dynamic Response
• Soft-Start

图2. 360W评估板UCC28180EVM-573外形图(顶)

图3. 360W评估板UCC28180EVM-573外形图(底)
评估板UCC28180EVM-573重要指标:

图4.评估板UCC28180EVM-573电路图

图5.评估板UCC28180EVM-573测试连接图

图6.评估板UCC28180EVM-573 PCB元件布局图(顶层)

图7.评估板UCC28180EVM-573 PCB元件布局图(底层)
评估板UCC28180EVM-573 材料清单(BOM):
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