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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

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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

TSOP ? 6

(SOT23 ? 6, SC59 ? 6)

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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

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=Assembly Location

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= Work Week

= Pb ? Free Package

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

? V CC 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

(Note: Microdot may be in either location)

PIN CONNECTIONS

CS 1 6 Gate

GND 2 5 V CC

CT 3 4 IVC

(Top View)

ORDERING INFORMATION

Device Package Shipping ?

NCL30100SNT1G TSOP ? 6 3000 / Tape & Reel

(Pb ? Free)

?For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specifications

Brochure, BRD8011/D.

? Semiconductor Components Industries, LLC, 2011

January, 2011 ? Rev. 3

Publication Order Number:

NCL30100/D

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