On Semi 公司的NCL30100是 效率大于95% 的LED驱动器控制器，开关频率高达700kHz，不需要输出电容，VCC工作范围从6.35 到18 V，可驱动一个或多个大功率LED，主要用在MR16 LED照明，环境灯照明，太阳能LED，交通照明，室外照名和LED照明棒等。本文介绍了NCL30100主要特性，方框图，典型应用电路以及MR16应用电路图和MR16评估板材料清单，115Vac转换器设计案例电路图和相应的材料清单。
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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