On Semi 公司的NCL30100是 效率大于95% 的LED驅動器控制器，開關頻率高達700kHz，不需要輸出電容，VCC工作范圍從6.35 到18 V，可驅動一個或多個大功率LED，主要用在MR16 LED照明，環境燈照明，太陽能LED，交通照明，室外照名和LED照明棒等。本文介紹了NCL30100主要特性，方框圖，典型應用電路以及MR16應用電路圖和MR16評估板材料清單，115Vac轉換器設計案例電路圖和相應的材料清單。
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Fixed Off Time Switched Mode LED Driver Controller
The NCL30100 is 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應用：
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
圖1。NCL30100方框圖
圖2。NCL30100典型LED轉換器應用案例
圖3。NCL30100案例設計電路圖
圖4。NCL30100案例設計PCB外形圖
單層評估板材料清單（NL30100ASLPDGEVB）
圖5。NCL30100 MR16應用電路圖
MR16評估板材料清單（NL30100ADLRMGEVB）
圖6。NCL30100 115Vac轉換器設計案例電路圖
NCL30100 115 Vac材料清單：
詳情請見：
http://www.onsemi.cn/pub_link/Collateral/NCL30100-D.PDF
和
http://www.onsemi.cn/pub_link/Collateral/NL30100ADLRMGEVB_SCHEMATIC.PDF
