摘要：  本文介绍了R1152主要特性，方框图，应用电路以及采用R1152的350W电源参考计的主要特性指标，电路图，材料清单和PCB布局图.

关键字：  IC，  PFC，  DC，  PCB

 IR公司的IRAC1152是固定频率66kHz的功率因素修正IC，采用IR公司的”一周期”控制技术，提供高的PFC和极好的DC总线调整，从而大大地降低元件数量，PCB面积和设计时间.通用85-264VAC输入电压，具有输入低压保护，过压保护，逐个周期的限流，开环保护，VCC UVLO，软起动和小于75uA的微功耗起动电流.本文介绍了R1152主要特性，方框图，应用电路以及采用R1152的350W$电源参考计的主要特性指标，电路图，材料清单和PCB布局图.

 IR1152S: FIXED 66kHz FREQUENCY， μPFC ONE CYCLE CONTROL PFC IC WITH BROWN-OUT PROTECTION

 μPFC IR1152 power factor correction IC， based on IR proprietary "One Cycle Control" (OCC) technique， provides for high PF and excellent DC Bus regulation while enabling drastic reduction in component count， PCB area and design time as compared to traditional solutions. The IC is designed to operate in 85-264VAC universal input， continuous conduction mode Boost PFC at fixed 66kHz switching frequency.

 IR1152 features include input-line sensed brown-out protection， overvoltage protection， cycle by cycle peak current limit， open loop protection， VCC UVLO， soft-start and micropower startup current of less than 75μA. In addition， for standby power requirements， the IC can be driven into a micropower sleep mode by pulling the OVP/EN pin low where the current consumption is less than 75uA. The IR1152 is available in SO-8 packages.

 R1152主要特性:

　　• PFC IC with IR proprietary “One Cycle Control”

　　• Continuous conduction mode boost type PFC

　　• Fixed 66kHz switching frequency

　　• Average current mode control

　　• Input line sensed brownout protection

　　• Output overvoltage protection

　　• Open loop protection

　　• Cycle by cycle peak current limit

　　• VCC under voltage lockout

　　• Programmable soft start

　　• Micropower startup

　　• User initiated micropower “Sleep Mode”

　　• 750mA peak gate drive

　　• Latch immunity and ESD protection

　　图1.R1152方框图

　　图2.R1152应用电路图

　　IRAC1152-350W参考设计

　　Reference Design Kit for IR1152 (Fixed 66kHz Frequency， One Cycle Control PFC IC with Brown-Out Protection)

　　IRAC1152-350W is a full function AC-DC reference design showcasing the operation of IR1152 PFC IC in a continuous conduction mode boost converter for achieving power factor correction， sub-10% harmonic current distortion and EN61000-3-2 Class D harmonic current limits standard compliance. Designed to be operated from 85-264VAC universal input voltage， IRAC1152-350W delivers 350W continuous output power via a fully regulated 388V DC bus. Thanks to IR1152 PFC IC， the reference design is rendered with a very high level of safety against system abnormalities such as AC line sag， DC bus voltage loop feedback loss， system overcurrent & overvoltage.

　　Combining the cost-advantage of single layer PCB and ferrite-core boost inductors with optimized PCB layout， the IRAC1152-350W reference design is an excellent design example that can be seamlessly imported & integrated by system designers that require a high-performance PFC stage at the AC-DC front-end of their designs in a variety of applications.

　　IRAC1152-350W参考设计主要特性:

　　IEC61000-3-2 Class D Standards Compliant

　　Less than 10% Total Harmonic Distortion (115-230VAC/350W)

　　Universal AC Input Voltage capability

　　Fully regulated 388V DC bus

　　Full load start-up， no minimum load requirements

　　Current loop controlled soft-current limit protection for overpower limitation at minimum VAC

　　High Efficiency Si Superjunction MOSFET boost switch

　　Hyper-fast recovery Si boost diode

　　On-board Flyback SMPS for 15V VCC supply (option to disable for external VCC bias supply)

　　Single layer PCB illustrating layout best-practices

　　IRAC1152-350W参考设计主要指标:

　　图3.IRAC1152-350W参考设计外形图

　　图4.IRAC1152-350W参考设计电路图:EMI滤波器级

　　图5.IRAC1152-350W参考设计电路图:PFC级

　　图6.IRAC1152-350W参考设计电路图:反激开关电源(SMPS)级

　　IRAC1152-350W参考设计材料清单(BOM):

　　图7.IRAC1152-350W参考设计PCB和元件布局图