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(huán)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