NSI45020AT1G
Constant Current Regulator
& LED Driver
45 V, 20 mA
+
10%, 460 mW Package
The linear constant current regulator (CCR) is a simple, economical
and robust device designed to provide a cost−effective solution for
regulating current in LEDs (similar to Constant Current Diode, CCD).
The CCR is based on Self-Biased Transistor (SBT) technology and
regulates current over a wide voltage range. It is designed with a
negative temperature coefficient to protect LEDs from thermal
runaway at extreme voltages and currents.
The CCR turns on immediately and is at 25% of regulation with
only 0.5 V Vak. It requires no external components allowing it to be
designed as a high or low−side regulator. The high anode-cathode
voltage rating withstands surges common in Automotive, Industrial
and Commercial Signage applications. The CCR comes in thermally
robust packages and is qualified to AEC-Q101 standard, and
UL94−V0 certified.
Features
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I
reg(SS)
= 20 mA
@ Vak = 7.5 V
Anode 2
•
•
•
•
•
•
•
•
Robust Power Package: 460 mW
Wide Operating Voltage Range
Immediate Turn-On
Voltage Surge Suppressing − Protecting LEDs
UL94−V0 Certified
SBT (Self−Biased Transistor) Technology
Negative Temperature Coefficient
NSV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q101
Qualified and PPAP Capable
•
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
Cathode 1
2
1
SOD−123
CASE 425
STYLE 1
MARKING DIAGRAM
1
AD
M
G
AD M
G
G
2
•
Automobile: Chevron Side Mirror Markers, Cluster, Display &
•
•
•
•
Instrument Backlighting, CHMSL, Map Light
AC Lighting Panels, Display Signage, Decorative Lighting, Channel
Lettering
Switch Contact Wetting
Application Note AND8391/D − Power Dissipation Considerations
Application Note AND8349/D − Automotive CHMSL
Rating
Anode−Cathode Voltage
Reverse Voltage
Operating and Storage Junction
Temperature Range
ESD Rating:
Human Body Model
Machine Model
Symbol
Vak Max
V
R
T
J
, T
stg
ESD
Value
45
500
−55 to +150
Class 1C
Class B
Unit
V
mV
°C
= Device Code
= Date Code
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
NSI45020AT1G
NSV45020AT1G
Package
SOD−123
(Pb−Free)
SOD−123
(Pb−Free)
Shipping
†
3000/Tape & Reel
3000/Tape & Reel
MAXIMUM RATINGS
(T
A
= 25°C unless otherwise noted)
†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.
Stresses exceeding those listed in the Maximum Ratings table may damage the
device. If any of these limits are exceeded, device functionality should not be
assumed, damage may occur and reliability may be affected.
©
Semiconductor Components Industries, LLC, 2014
1
April, 2014 − Rev. 6
Publication Order Number:
NSI45020A/D
NSI45020AT1G
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
Characteristic
Steady State Current @ Vak = 7.5 V (Note 1)
Voltage Overhead (Note 2)
Pulse Current @ Vak = 7.5 V (Note 3)
Capacitance @ Vak = 7.5 V (Note 4)
Capacitance @ Vak = 0 V (Note 4)
1.
2.
3.
4.
Symbol
I
reg(SS)
V
overhead
I
reg(P)
C
C
19.85
Min
18
Typ
20
1.8
22.5
2.5
5.7
25.15
Max
22
Unit
mA
V
mA
pF
pF
I
reg(SS)
steady state is the voltage (Vak) applied for a time duration
≥
10 sec, using FR−4 @ 300 mm
2
1 oz. Copper traces, in still air.
V
overhead
= V
in
− V
LEDs
. V
overhead
is typical value for 85% I
reg(SS)
.
I
reg(P)
non−repetitive pulse test. Pulse width t
≤
300
msec.
f = 1 MHz, 0.02 V RMS.
Figure 1. CCR Voltage−Current Characteristic
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2
NSI45020AT1G
THERMAL CHARACTERISTICS
Characteristic
Total Device Dissipation (Note 5) T
A
= 25°C
Derate above 25°C
Thermal Resistance, Junction−to−Ambient (Note 5)
Thermal Reference, Lead−to−Ambient (Note 5)
Thermal Reference, Junction−to−Cathode Lead (Note 5)
Total Device Dissipation (Note 6) T
A
= 25°C
Derate above 25°C
Thermal Resistance, Junction−to−Ambient (Note 6)
Thermal Reference, Lead−to−Ambient (Note 6)
Thermal Reference, Junction−to−Cathode Lead (Note 6)
Total Device Dissipation (Note 7) T
A
= 25°C
Derate above 25°C
Thermal Resistance, Junction−to−Ambient (Note 7)
Thermal Reference, Lead−to−Ambient (Note 7)
Thermal Reference, Junction−to−Cathode Lead (Note 7)
Total Device Dissipation (Note 8) T
A
= 25°C
Derate above 25°C
Thermal Resistance, Junction−to−Ambient (Note 8)
Thermal Reference, Lead−to−Ambient (Note 8)
Thermal Reference, Junction−to−Cathode Lead (Note 8)
Total Device Dissipation (Note 9) T
A
= 25°C
Derate above 25°C
Thermal Resistance, Junction−to−Ambient (Note 9)
Thermal Reference, Lead−to−Ambient (Note 9)
Thermal Reference, Junction−to−Cathode Lead (Note 9)
Total Device Dissipation (Note 10) T
A
= 25°C
Derate above 25°C
Thermal Resistance, Junction−to−Ambient (Note 10)
Thermal Reference, Lead−to−Ambient (Note 10)
Thermal Reference, Junction−to−Cathode Lead (Note 10)
Junction and Storage Temperature Range
Symbol
P
D
R
θ
JA
R
ψ
LA
R
ψ
JL
P
D
R
θ
JA
R
ψ
LA
R
ψ
JL
P
D
R
θ
JA
R
ψ
LA
R
ψ
JL
P
D
R
θ
JA
R
ψ
LA
R
ψ
JL
P
D
R
θ
JA
R
ψ
LA
R
ψ
JL
P
D
R
θ
JA
R
ψ
LA
R
ψ
JL
T
J
, T
stg
Max
208
1.66
600
404
196
227
1.8
550
390
160
347
2.8
360
200
160
368
2.9
340
208
132
436
3.5
287
139
148
463
3.7
270
150
120
−55 to +150
Unit
mW
mW/°C
°C/W
°C/W
°C/W
mW
mW/°C
°C/W
°C/W
°C/W
mW
mW/°C
°C/W
°C/W
°C/W
mW
mW/°C
°C/W
°C/W
°C/W
mW
mW/°C
°C/W
°C/W
°C/W
mW
mW/°C
°C/W
°C/W
°C/W
°C
5. FR−4 @ 100 mm
2
, 1 oz. copper traces, still air.
6. FR−4 @ 100 mm
2
, 2 oz. copper traces, still air.
7. FR−4 @ 300 mm
2
, 1 oz. copper traces, still air.
8. FR−4 @ 300 mm
2
, 2 oz. copper traces, still air.
9. FR−4 @ 500 mm
2
, 1 oz. copper traces, still air.
10. FR−4 @ 500 mm
2
, 2 oz. copper traces, still air.
NOTE: Lead measurements are made by non−contact methods such as IR with treated surface to increase emissivity to 0.9.
Lead temperature measurement by attaching a T/C may yield values as high as 30% higher
°C/W
values based upon empirical
measurements and method of attachment.
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3
NSI45020AT1G
TYPICAL PERFORMANCE CURVES
Minimum FR−4 @ 300 mm
2
, 1 oz Copper Trace, Still Air
I
reg(SS)
, STEADY STATE CURRENT (mA)
25
T
A
= −40°C
20
T
A
= 25°C
T
A
= 85°C
15
I
reg(P)
, PULSE CURRENT (mA)
[
−0.052 mA/°C
typ @ Vak = 7.5 V
[
−0.044 mA/°C
typ @ Vak = 7.5 V
23.0
22.5
T
A
= 25°C
22.0
21.5
21.0
20.5
Non−Repetitive Pulse Test
10
20.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10
10
5
DC Test Steady State, Still Air
0
1
2
3
4
5
6
7
8
9
0
Vak, ANODE−CATHODE VOLTAGE (V)
Vak, ANODE−CATHODE VOLTAGE (V)
Figure 2. Steady State Current (I
reg(SS)
) vs.
Anode−Cathode Voltage (Vak)
I
reg(SS)
, STEADY STATE CURRENT (mA)
22
I
reg
, CURRENT REGULATION (mA)
Vak @ 7.5 V
T
A
= 25°C
21
23
Figure 3. Pulse Current (I
reg(P)
) vs.
Anode−Cathode Voltage (Vak)
Vak @ 7.5 V
T
A
= 25°C
22
20
21
19
20
18
19
19
20
21
22
23
24
25
26
0
5
10
15
20
25
30
35
I
reg(P)
, PULSE CURRENT (mA)
TIME (s)
Figure 4. Steady State Current vs. Pulse
Current Testing
800
P
D
, POWER DISSIPATION (mW)
700
600
500 mm
2
/1 oz
500
300 mm
2
/2 oz
2
400 300 mm /1 oz
100 mm
2
/2 oz
100 mm
2
/1 oz
500 mm
2
/2 oz
Figure 5. Current Regulation vs. Time
300
200
100
−40
−20
0
20
40
60
80
T
A
, AMBIENT TEMPERATURE (°C)
Figure 6. Power Dissipation vs. Ambient
Temperature @ T
J
= 1505C
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4
NSI45020AT1G
APPLICATIONS INFORMATION
The CCR is a self biased transistor designed to regulate the
current through itself and any devices in series with it. The
device has a slight negative temperature coefficient, as
shown in Figure 2 – Tri Temp. (i.e. if the temperature
increases the current will decrease). This negative
temperature coefficient will protect the LEDS by reducing
the current as temperature rises.
The CCR turns on immediately and is typically at 20% of
regulation with only 0.5 V across it.
The device is capable of handling voltage for short
durations of up to 45 V so long as the die temperature does
not exceed 150°C. The determination will depend on the
thermal pad it is mounted on, the ambient temperature, the
pulse duration, pulse shape and repetition.
Single LED String
The CCR can be placed in series with LEDs as a High Side
or a Low Side Driver. The number of the LEDs can vary
from one to an unlimited number. The designer needs to
calculate the maximum voltage across the CCR by taking the
maximum input voltage less the voltage across the LED
string (Figures 7 and 8).
Figure 8.
Higher Current LED Strings
Two or more fixed current CCRs can be connected in
parallel. The current through them is additive (Figure 9).
Figure 7.
Figure 9.
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