Fixed Off Time Switched Mode LED Driver Controller - ON Semiconductor
Description
NCL30100
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.
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 with Negative 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
• 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
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MARKING DIAGRAM
TSOP−6
(SOT23−6, SC59−6) AAAAYWG
SN SU...
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