NUD4001, NSVD4001
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
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PIN CONFIGURATION
AND SCHEMATIC
V
in
Boost
R
ext
GND
1
2
3
4
Current
Set Point
8
7
6
5
I
out
I
out
I
out
I
out
•
•
•
•
•
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)
AEC−Q101 Qualified and PPAP Capable
NSV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements
•
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
SO−8
CASE 751
STYLE 25
MARKING
DIAGRAM
8
8
1
4001
AYWW
G
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
1
2
3
4
5, 6, 7, 8
Symbol
V
in
Boost
R
ext
GND
I
out
Description
Positive input voltage to the device
This pin may be used to drive an external transistor
as described in the App Note AND8198/D.
An external resistor between R
ext
and V
in
pins sets
different current levels for different application needs
Ground
The LEDs are connected from these pins to ground
1
4001
A
Y
WW
G
= Specific Device Code
= Assembly Location
= Year
= Work Week
= Pb−Free Device
ORDERING INFORMATION
Device
NUD4001DR2
NUD4001DR2G
NSVD4001DR2G
Package
SO−8
SO−8
(Pb−Free)
SO−8
(Pb−Free)
Shipping
†
2500 / Tape & Reel
2500 / Tape & Reel
2500 / Tape & Reel
†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, 2011
November, 2011
−
Rev. 7
1
Publication Order Number:
NUD4001/D
NUD4001, NSVD4001
MAXIMUM RATINGS
(T
A
= 25°C unless otherwise noted)
Rating
Continuous Input Voltage
Non−repetitive Peak Input Voltage (t
v
1.0 ms)
Output Current
(For V
drop
≤
2.2 V) (Note 1)
Output Voltage
Human Body Model (HBM)
Symbol
V
in
V
p
I
out
V
out
ESD
Value
30
60
500
28
1000
Unit
V
V
mA
V
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. V
drop
= V
in
– 0.7 V
−
V
LEDs
.
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
T
A
T
J
T
STG
P
D
R
qJA
R
qJL
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
(T
A
= 25°C unless otherwise noted)
Characteristic
Output Current1
(V
in
= 12 V, R
ext
= 2.0
W,
V
LEDs
= 10 V)
Output Current2
(V
in
= 30 V, R
ext
= 7.0
W,
V
LEDs
= 24 V)
Bias Current
(V
in
= 12 V, R
ext
= Open, V
LEDs
= 10 V)
Voltage Overhead (Note 3)
3. V
over
= V
in
– V
LEDs
.
Symbol
I
out1
I
out2
I
Bias
V
over
Min
305
95
−
1.4
Typ
325
105
5.0
−
Max
345
115
8.0
Unit
mA
mA
mA
V
−
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2
NUD4001, NSVD4001
TYPICAL PERFORMANCE CURVES
(T
A
= 25°C unless otherwise noted)
1000
0.9
0.8
0.7
100
V
sense
(V)
1
10
I
OUT
(mA)
100
1000
R
ext
,
W
0.6
0.5
0.4
0.3
0.2
0.1
1
0.0
−40 −25 −10
5
20 35 50 65 80 95 110 125 140 155
10
T
J
, JUNCTION TEMPERATURE (°C)
Figure 1. Output Current (I
OUT
)
vs. External Resistor (R
ext
)
1.200
P
D
, POWER DISSIPATION (W)
1.000
P
D_control
(W)
0.800
0.600
0.400
0.200
0.000
25
0.500
0.450
0.400
0.350
0.300
0.250
0.200
0.150
0.100
0.050
35
45
55
65
75
85
95
105 115 125
0.000
0
Figure 2. V
sense
vs. Junction Temperature
5
10
15
V
in
(V)
20
25
30
T
A
, AMBIENT TEMPERATURE (°C)
Figure 3. Total Power Dissipation (P
D
)
vs. Ambient Temperature (T
A
)
1.2
OUTPUT CURRENT, NORMALIZED
1.0
0.8
0.6
0.4
0.2
0.0
−40 −25 −10
5
Figure 4. Internal Circuit Power Dissipation
vs. Input Voltage
20 35 50 65 80 95 110 125 140 155
T
J
, JUNCTION TEMPERATURE (°C)
Figure 5. Current Regulation vs. Junction
Temperature
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NUD4001, NSVD4001
APPLICATION INFORMATION
Design Guide
NUD4001
V
in
1
2
3
4
Current
Set Point
8
7
6
5
I
out
I
out
I
out
I
out
1. Define LED’s current:
a. I
LED
= 350 mA
2. Calculate Resistor Value for R
ext
:
a. R
ext
= V
sense
(see Figure 2) / I
LED
b. R
ext
= 0.7 (T
J
= 25
°C)/
0.350 = 2.0
W
3. Define V
in
:
a. Per example in Figure 6, V
in
= 12 V
4. Define V
LED
@ I
LED
per LED supplier’s data
sheet:
a. Per example in Figure 6,
V
LED
= 3.5 V + 3.5 V + 3.5 V = 10.5 V
5. Calculate V
drop
across the NUD4001 device:
a. V
drop
= V
in
– V
sense
– V
LED
b. V
drop
= 12 V – 0.7 V (T
J
= 25
°C)
– 10.5 V
c. V
drop
= 0.8 V
6. Calculate Power Dissipation on the NUD4001
device’s driver:
a. P
D_driver
= V
drop
* I
out
b. P
D_driver
= 0.8 V x 0.350 A
c. P
D_driver
= 0.280 Watts
7. Establish Power Dissipation on the NUD4001
device’s control circuit per Figure 4:
a. P
D_control
= Figure 4, for 12 V input voltage
b. P
D_control
= 0.055 W
8. Calculate Total Power Dissipation on the device:
a. P
D_total
= P
D_driver
+ P
D_control
b. P
D_total
= 0.280 W + 0.055 W = 0.335 W
9. If P
D_total
> 1.13 W (or derated value per
Figure 3), then select the most appropriate
recourse and repeat steps 1 through 8:
a. Reduce V
in
b. Reconfigure LED array to reduce V
drop
c. Reduce I
out
by increasing R
ext
d. Use external resistors or parallel device’s
configuration (see application note AND8156)
10. Calculate the junction temperaure using the
thermal information on Page 7 and refer to Figure
5 to check the output current drop due to the
calculated junction temperature. If desired,
compensate it by adjusting the value of R
ext
.
12 V
Boost
R
ext
GND
Figure 6. 12 V Application
(Series LED’s Array)
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4
NUD4001, NSVD4001
TYPICAL APPLICATION CIRCUITS
D1
1N4004
R1
2.7
W,
1/4 W
1
2
4
Q1
8
7
5
R3
2.7
W,
1/4 W
1
2
4
Q2
8
7
5
3 NUD4001 6
3 NUD4001 6
V
bat
+
13.5 Vdc
−
R2
32
W,
5.0 W
R4
32
W,
5.0 W
R3
6.7
W,
4.0 W
LED1
Luxeon
Emitter
550 mA
0
Figure 7. Stop light automotive circuit using the NUD4001 device
to drive one high current LED (550 mA).
D1
1N4004
R1
7.0
W,
1/4 W
1
2
4
Q1
8
7
5
R2
7.0
W,
1/4 W
1
2
4
Q2
8
7
5
3 NUD4001 6
3 NUD4001 6
V
bat
+
13.5 Vdc
−
R3
27
W,
2.0 W
LED1
Luxeon
Emitter
220 mA
0
Figure 8. Dome light automotive circuit using the NUD4001 device
to drive one LED (220 mA).
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