On Semi NCL30100 效率95% LED驱动解决方案
Fixed Off Time Switched Mode LED Driver Controller
TheNCL30100is a compact switching regulator controller intended for space constrained constant current high−brightness LED driver applications where efficiency and small size are important. The controller is based on a peak current, quasi fixed−off time control architecture optimized for continuous conduction mode step−down (buck) operation. This allows the output filter capacitor to be eliminated. In this configuration, a reverse buck topology is used to control a cost effective N−type MOSFET. Moreover, this controller employs negative current sensing thus minimizing power dissipation in the current sense resistor. The off time is user adjustable through the selection of a small external capacitor, thus allowing the design to be optimized for a given switching frequency range. The control loop is designed to operate up to 700 kHz allowing the designer the flexibility to use a very small inductor for space constrained applications.
The device has been optimized to provide a flexible inductive step−down converter to drive one or more high power LED(s). The controller can also be used to implement non−isolated buck−boost driver topologies.
NCL30100主要特性:
Quasi−Fixed OFF Time, Peak Current Control Method
N−FET Based Controller Architecture
Up to 700 kHz Switching Frequency
Up to >95% Efficiency
No Output Capacitor Needed
VCC Operation from 6.35 − 18 V
Adjustable Current Limit with Negative Sensing
Inherent Open LED Protected
Very Low Current Consumption at Startup
Undervoltage Lockout
Compact Thin TSOP−6 Pb−Free Package
−40 to + 125C Operating Temperature Range
This is a Pb−Free Device
NCL30100应用:
Low Voltage Halogen LED Replacement (MR 16)
LED Track Lighting
Landscape Lighting
Solar LED Applications
Transportation Lighting
12 V LED Bulb Replacement
Outdoor Area Lighting
LED Light Bars
图1。NCL30100方框图
图2。NCL30100典型LED转换器应用案例
图3。NCL30100案例设计电路图
图4。NCL30100案例设计PCB外形图
单层评估板材料清单(NL30100ASLPDGEVB)
图5。NCL30100 MR16应用电路图
MR16评估板材料清单(NL30100ADLRMGEVB)
图6。NCL30100 115Vac转换器设计案例电路图
NCL30100 115 Vac材料清单:
详情请见:
http://www.onsemi.cn/pub_link/Collateral/NCL30100-D.PDF
和
http://www.onsemi.cn/pub_link/Collateral/NL30100ADLRMGEVB_SCHEMATIC.PDF
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