Onsemi NCL30100

Description

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 isdesigned 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.

Features

• 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 withNegative Sensing
• Inherent Open LED Protected
• Very Low Current Consumption at Startup
• Undervoltage Lockout
• Compact Thin TSOP−6 Pb−Free Package
• −40 to + 125°C Operating Temperature Range
• This is a Pb−Free Device

Typical applications

• 12 V LED Bulb Replacement
• Landscape Lighting
• Low Voltage Halogen LED Replacement (MR 16)
• Outdoor Area Lighting
• Solar LED Applications
• Transportation Lighting
• LED Track Lighting
• LED Light Bars

More information

• Datasheet
• IC product information