NUD4011
Low Current LED Driver
This device is designed to replace discrete solutions for driving
LEDs in AC/DC high voltage applications (up to 200 V). An external
resistor allows the circuit designer to set the drive current for different
LED arrays. This discrete integration technology eliminates individual
components by combining them into a single package, which results in
a significant reduction of both system cost and board space. The
device is a small surface mount package (SO−8).
http://onsemi.com
PIN CONFIGURATION
AND SCHEMATIC
Features
•
•
•
•
Supplies Constant LED Current for Varying Input Voltages
External Resistor Allows Designer to Set Current – up to 70 mA
Offered in Surface Mount Package Technology (SO−8)
Pb−Free Package is Available
Vin
1
8
Iout
Boost
2
7
Iout
Rext
3
6
Iout
PWM
4
5
Iout
Benefits
•
•
•
•
Maintains a Constant Light Output During Battery Drain
One Device can be used for Many Different LED Products
Reduces Board Space and Component Count
Simplifies Circuit and System Designs
Current
Set Point
Typical Applications
• Portables: For Battery Back−up Applications, also Simple Ni−CAD
•
•
Battery Charging
Industrial: General Lighting Applications and Small Appliances
Automotive: Tail Lights, Directional Lights, Back−up Light,
Dome Light
PIN FUNCTION DESCRIPTION
Pin
Symbol
1
Vin
2
Boost
This pin may be used to drive an external transistor
as described in the App Note AND8198/D.
3
Rext
An external resistor between Rext and Vin pins sets
different current levels for different application needs
4
PWM
For high voltage applications (higher than 48 V),
pin 4 is connected to the LEDs array.
For low voltage applications (lower than 48 V), pin 4
is connected to ground.
5, 6, 7, 8
Iout
Description
Positive input voltage to the device
The LEDs are connected from these pins to ground
MARKING
DIAGRAM
8
SO−8
CASE 751
8
1
1
4011
AYWWG
G
A
= Assembly Location
Y
= Year
WW
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
NUD4011DR2
NUD4011DR2G
Package
Shipping †
SO−8
2500 / Tape & Reel
SO−8
2500 / 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 Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2006
June, 2006 − Rev. 3
1
Publication Order Number:
NUD4011/D
