The NCL30001 is a highly integrated controller for implementing power factor correction (PFC) and isolated step down ac−dc power conversion in a single stage, resulting in a lower cost and reduced part count solution. This controller is ideal for LED Driver power supplies with power requirements between 40 W and 150 W. The single stage is based on the flyback converter and it is designed to operate in continuous conduction (CCM).
The NCL30001 can be configured as constant current driver or a fixed output driver for two stage LED lighting applications. In addition, the controller features a proprietary Soft−Skip??to reduce acoustic noise at light loads. Other features found in the NCL30001 include a high voltage startup circuit, voltage feedforward, brown out detector, internal overload timer, latch input and a high accuracy multiplier. The multi−function latch off pin can also be used to implement an overtemperature shutdown circuit.
NCL30001主要特性:
??Voltage Feedforward Improves Loop Response
??Frequency Jittering Reduces EMI Signature
??Proprietary Soft−Skip at Light Loads Reduces Acoustic Noise
??Brown Out Detector
??Internal 160 ms Fault Timer
??Independent Latch−Off Input Facilitates Implementation of Overvoltage and Overtemperature Fault Detectors
??Average Current Mode Control (ACMC), Fixed Frequency Operation
??High Accuracy Multiplier Reduces Input Line Harmonics
??Adjustable Operating Frequency from 20 kHz to 250 kHz
??These Devices are Pb−Free and are RoHS Compliant
NCL30001應用:
??LED Street Lights
??Low Bay LED Lighting
??High Power LED Drivers
??Architectural LED Lighting
圖1. NCL30001方框圖
圖2. NCL30001典型應用電路圖
高PFC的100V/450mA離線LED驅動器
100V/450mA離線LED驅動器指標:
This Design Note (DN) is an extension to ON Semiconductor’s Application Note AND8470/D and features a 100 volt max, 0.45 amp version of the off-line, NCL30001 based constant voltage, constant current (CVCC) LED driver with inherent PFC described in that app note.
The original app note features a 50 volt max, constant current, 1 to 2 amp (current settable) LED driver with multiple dimming capabilities and active power factor correction in a single continuous conduction mode (CCM) flyback converter stage. This DN presents a similar version that is suitable for driving series LED strings up to 100 volts at a max current of up to about 600 millamps. This design is suitable for LED strip lighting and fluorescent lamp replacements. The maximum voltage and output current can be adjusted via resistors R34 and R32 respectively. The detailed circuit operational description can be found in the original mentioned app note (AND8470/D) and is essentially identical circuit-wise with the exception of the component changes that are indicated in the BOM. The flyback transformer design for this DN was merely ratioed from the secondary winding on the original design to meet the new maximum voltage and current requirements. The primary winding, required inductance, and overall construction are essentially the same.
100V/450mA離線LED驅動器主要特性:
Single stage, isolated PFC converter for strip lighting and fluorescent tube replacements.
Constant voltage, constant current output characteristic for LED drive
Dimming features including pulse width dimming to 3%
Over current, over voltage and over temperature capabilities
Typical efficiencies above 86%
圖3.100V/450mA離線LED驅動器初級電路圖1
圖4.100V/450mA離線LED驅動器次級電路圖1
詳情請見:
http://www.onsemi.cn/pub_link/Collateral/NCL30001%20DATA%20SHEET.PDF
和
http://www.onsemi.cn/pub_link/Collateral/DN05016-D.PDF
