Infineon公司的ICL5101是集成了PFC的半桥控制器,PFC级工作在CrCM和DCM模式,支持低至正常负载0.1%时稳定工作,通用的AC和DC输入,集成了高压栅极驱动器,功率因素大于99%,THD小于10%,效率高达95%,起动时间小于200ms,主要用在户内和户外大功率LED照明,街灯照明,停车场和区域照明以及办公室照明.本文介绍了ICL5101主要特性, 典型应用电路以及采用PFCLLC拓扑的110 W/54 V LED驱动器演示板主要特性,电路图,材料清单和PCB元件布局图.
The ICL5101 integrates a half-bridge controller with a PFC stage in a single package. The high level of integration assures a low count of external components, enabling small form factor designs ideal for compact power supplies in lighting applications, such as LED driver.
The PFC stage operates in CrCM and DCM mode, supporting stable operation at low load conditions down to 0.1% of the nominal power. The half-bridge resonant stage – typically in LLC topology – provides high- and low-side gate drive function for discrete MOSFETs rated up to 650V. Its non-overlap dead time is adaptive from 500ns ... 1.0μs.
All operation parameters of the IC are adjustable by simple resistors, this being the ideal choice for cheap and reliable configuration. A comprehensive set of protection features incl. an adjustable external over temperature protection and capacitive load protection ensures the detection of fault conditions to increase the system safety.
ICL5101主要特性:
Universal AC and DC input
Combined PFC and half-bridge IC
Integrated high-voltage gate driver
Power factor > 99%, THD < 10%
High efficiency up to 95%
Short startup time < 200ms
ICL5101主要优势:
High level of integration resulting in a low external component count and a cost
All operation parameters are adjustable with simple resistors to allow simple configuration
Stable low load operation mode
Comprehensive protection modes
ICL5101应用:
Indoor and outdoor high-power LED lighting
High-bay and low-bay lighting
Street lighting
Parking garages and area lighting
Office panel lighting
图1.ICL5101典型应用电路
ICL5101采用PFCLLC拓扑的110 W/54 V LED驱动器演示板
This application note describes the characteristics and features of a 110 W SMPS demonstration board withconstant 54 V voltage output. High efficiency, high PF, low iATHD and very stable output voltage with lowripple at whole power range are the key features of this demonstration board, which makes it very suitableto be used as a primary power supply for low power systems, such as LED lighting. Its compact design andlow BOM cost is due to Infineon IC ICL5101 (CritCM PFC and resonant block are integrated together), which isused as main controller here. With this highly integrated smart IC, the circuit design is dramaticallysimplified, which results space and BOM cost saving. Furthermore, numerous monitor and protectionfeatures ensure highest reliability.
图2.110 W/54 V LED驱动器演示板外形图
This demo board consists of a CrCM PFC and a half-bridge LLC, which outputs a stable 54 VDC voltage.The PFC stage of this demo board is controlled by the PFC block of the ICL5105, which has an integrateddigital PFC control loop and improved compensation for low THD of AC input current. It operates in criticalconductionmode (CrCM) in a load range from10%to 100%to achieve a very good power factor and verylow THD. When the load is smaller than 10%, in order to limit the PFC switching frequency, the IC controlsthe PFC to operate in discontinuous conductionmode (DCM).
The half-bridge LLC stage has a fixed duty cycle of D=0.5 and an adjustable self-adapting dead time from0.5 μs to 1 μs. The operation frequency starts fromtypical 135 kHz at start-up and decreases to a range ofbetween 45 kHz (full load) and 75 kHz (output open loop). The 54 V output voltage has a very stable valuethroughout the whole output power range. The value variation is tested to be smaller than 0.2%fromfullload to open loop. Over voltage protection (OVP) is implemented at themain output. When the outputvoltage reaches 60 V, themain converter is stopped by the OVP circuit. It starts to operate again when themain output decreases to 54 V. In addition,many other protection functions are also implemented, such asOutput Short Circuit Protection of themain output (OSCP), LLC primary winding short circuit protection(WSCP), Capacitive Mode Protection of themain output (CMP), LLC Over Current Protection (LOCP), overtemperature protection (OTP) at certain hot spot on board andmore. These protection functions arerealized by the built-in protection functions of the IC ICL5105.
110 W/54 V LED驱动器演示板主要特性:
Input voltage range: 85–305 VAC
Input voltage frequency: 47–63 Hz
Regulatedmain output voltage: 54 VDC / 2.06 A
Efficiency at nominal load: ≥ 93.5 % at 230 VAC
Input current THD: <10%@> 35%Load at 230 VAC
Harmonics: According to EN61000-3-2 Class-D
EMI: According to EN55015
Safety : According to EN61347-2-13
Board dimensions: 247.3mm(L) x 48.25mm(W) x 34.2mm(H)