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NUD4001
High Current LED Driver
This device is designed to replace discrete solutions for driving
LEDs in low voltage AC−DC applications 5.0 V, 12 V or 24 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).
Features
• Supplies Constant LED Current for Varying Input Voltages
• External Resistor Allows Designer to Set Current – up to 500 mA
• Offered in Surface Mount Package Technology (SO−8)
• Pb−Free Package is Available
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
Typical Applications
• Portables: For Battery Back−up Applications, also Simple Ni−CAD
Battery Charging
• Industrial: Low Voltage Lighting Applications and Small Appliances
• Automotive: Tail Lights, Directional Lights, Back−up Light,
Dome Light
PIN FUNCTION DESCRIPTION
Pin Symbol
Description
1 Vin Positive input voltage to the device
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
5, 6, 7, 8
GND
Iout
Ground
The LEDs are connected from these pins to ground
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PIN CONFIGURATION
AND SCHEMATIC
Vin 1
Boost 2
Rext 3
GND 4
Current
Set Point
8 Iout
7 Iout
6 Iout
5 Iout
8
1
SO−8
CASE 751
STYLE 25
MARKING
DIAGRAM
8
4001
AYWW
G
1
4001 = Specific Device Code
A = Assembly Location
Y = Year
WW = Work Week
G = Pb−Free Device
ORDERING INFORMATION
Device
Package
Shipping†
NUD4001DR2
SO−8 2500 / Tape & Reel
NUD4001DR2G 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. 6
1
Publication Order Number:
NUD4001/D
NUD4001
MAXIMUM RATINGS (TA = 25°C unless otherwise noted)
Rating
Symbol
Value
Unit
Continuous Input Voltage
Non−repetitive Peak Input Voltage (t v 1.0 ms)
Output Current
(For Vdrop ≤ 2.2 V) (Note 1)
Output Voltage
Human Body Model (HBM)
Vin
Vp
Iout
Vout
ESD
30
60
500
28
1000
V
V
mA
V
V
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. Vdrop = Vin – 0.7 V − VLEDs.
THERMAL CHARACTERISTICS
Characteristic
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Total Power Dissipation (Note 2)
Derating above 25°C (Figure 3)
Thermal Resistance, Junction–to–Ambient (Note 2)
Thermal Resistance, Junction–to–Lead (Note 2)
2. Mounted on FR−4 board, 2 in sq pad, 2 oz coverage.
Symbol
TA
TJ
TSTG
PD
RqJA
RqJL
Value
−40 to +125
150
−55 to +150
1.13
9.0
110
77
Unit
°C
°C
°C
W
mW/°C
°C/W
°C/W
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted)
Characteristic
Output Current1
(Vin = 12 V, Rext = 2.0 W, VLEDs = 10 V)
Output Current2
(Vin = 30 V, Rext = 7.0 W, VLEDs = 24 V)
Bias Current
(Vin = 12 V, Rext = Open, VLEDs = 10 V)
Voltage Overhead (Note 3)
3. Vover = Vin – VLEDs.
Symbol
Iout1
Iout2
IBias
Vover
Min Typ Max Unit
305 325 345 mA
95 105 115 mA
− 5.0 8.0 mA
1.4 − − V
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