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
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
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
controller can also be used to implement non−isolated buck−boost
driver topologies.
Features
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MARKING
DIAGRAM
TSOP−6
(SOT23−6, SC59−6)
AAAAYWG
G
SN SUFFIX
CASE 318G
1
AAA
A
Y
W
G
= Specific Device Code
=Assembly Location
= Year
= Work Week
= Pb−Free Package
1
(Note: Microdot may be in either location)
PIN CONNECTIONS
CS
GND
CT
1
2
3
(Top View)
6
5
4
Gate
V
CC
IVC
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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
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
ORDERING INFORMATION
Device
NCL30100SNT1G
Package
Shipping
†
TSOP−6 3000 / Tape & Reel
(Pb−Free)
Typical Applications
†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
1
Publication Order Number:
NCL30100/D
NCL30100
6.5 – 24 V
+
C1
R1
R2
LED1
D1
LEDX
L1
LED2
R3
IC1
NCL30100
CS
DRV
GND VCC
CT
IVC
−
C2
C3
R4
D2
Q1
Figure 1. Typical Application Example of the LED Converter
PIN FUNCTION DESCRIPTION
Pin N5
1
2
3
4
5
Pin Name
CS
GND
C
T
IVC
V
CC
Function
Current sense input
Ground
Timing capacitor
Input voltage compensation
Input supply
Pin Description
A resistor divider consisting of R3 and R4 is used to set the peak current
sensed through the MOSFET switch
Power ground.
Capacitor to establish the off time duration
The current injected into the input varies the switch off time and I
PK
allowing for
feedforward compensation.
Supply input for the controller. The input is rated to 18 V but as illustrated
Figure 1, a simple zener diode and resistor can allow the LED string to be
powered from a higher voltage
Output drive for an external power MOSFET
6
DRV
Driver output
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2
NCL30100
IVC
Input Voltage
Regulator
V
Offset
V
DD
I
ref
OFF Time
Comparator
Reference
Regulator
Undervoltage
Lockout
V
CC
6.35/5.85 V
0−3.9 V
CT
50
mA
CS
12.5−50
mA
Set
S
Gate Driver
SET
CLR
Q
Q
DRV
R
Reset
GND
Current Sense
Comparator
Figure 2. Simplified Circuit Architecture
MAXIMUM RATINGS
Rating
Power Supply Voltage
IVC Pins Voltage Range
CS and C
T
Pin Voltage Range
Thermal Resistance, Junction−to−Air
Junction Temperature
Storage Temperature Range
ESD Voltage Protection, Human Body Model (HBM)
ESD Voltage Protection, Machine Model (MM)
Symbol
V
CC
IVC
V
in
R
qJA
T
J
T
stg
V
ESD−HBM
V
ESD−MM
Value
18
−0.3
to 18
−0.3
to 10
178
150
−60
to +150
2
200
Unit
V
V
V
°C/W
°C
°C
kV
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. This device(s) contains ESD protection and exceeds the following tests:
Human Body Model 2000 V per JEDEC Standard JESD22−A114E
Machine Model 200 V per JEDEC Standard JESD22−A115−A
2. This device meets latchup tests defined by JEDEC Standard JESD78.
3. Moisture Sensitivity Level (MSL) 1.
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3
NCL30100
otherwise noted)
ELECTRICAL CHARACTERISTICS
(V
CC
= 12 V, for typical values T
J
= 25°C, for min/max values T
J
=
−40°C
to +125°C, unless
SUPPLY SECTION
Parameter
INPUT VOLTAGE COMPENSATION
Offset Voltage
C
T
Pin Voltage
C
T
Pin Voltage
IVC pin internal resistance (Note 4)
C
T
PIN – OFF TIME CONTROL
Source Current
Source Current
Source Current Maximum Voltage Capab-
ility (Note 4)
Minimum C
T
Pin Voltage (Note 4)
Pin to ground capacitance (Note 4)
Propagation Delay (Note 4)
CURRENT SENSE
Minimum Source Current
Minimum Source Current
Maximum Source Current
Maximum Source Current
Comparator Threshold Voltage (Note 4)
Propagation Delay
GATE DRIVER
Sink Resistance
Source Resistance
POWER SUPPLY
Startup Threshold
Minimum Operating Voltage
Vcc Hysteresis (Note 4)
Startup Current Consumption
Steady State Current Consumption
(Note 4)
Steady State Current Consumption
4. Guaranteed by design
V
CC
= 6 V
C
DRV
= 0 nF, f
SW
= 100 kHz, IVC = open,
V
CC
= 7 V
C
DRV
= 1 nF, f
SW
= 100 kHz, IVC = open,
V
CC
= 7 V
V
CC
increasing
V
CC
decreasing
V
CC(on)
V
CC(off)
V
CC(hyst)
I
CC1
I
CC2
I
CC2
0.5
−
5.45
−
−
6.35
5.85
0.5
22
300
1
1.15
6.65
−
−
35
V
V
V
mA
mA
mA
I
sink
= 30 mA
I
source
= 30 mA
R
OL
R
OH
5
20
15
60
40
100
W
W
CS Falling Edge to Gate Output
IVC = 180
mA,
C
T
Pin Grounded,
0
v
T
J
v
85°C
IVC = 180
mA,
C
T
Pin Grounded,
−40
v
T
J
v
125°C
IVC = 0
mA,
C
T
Pin Grounded,
0
v
T
J
v
85°C
IVC = 0
mA,
C
T
Pin Grounded,
−40
v
T
J
v
125°C
I
CS(min)
I
CS(min)
I
CS(max)
I
CS(max)
V
th
CS
delay
11. 75
11.35
47.25
45.25
−
−
12.5
12.5
50
50
38
215
13.25
13.25
52.75
52.75
−
310
mA
mA
mA
mA
mV
ns
CT Reach V
CT
Threshold to Gate Output
Pin Unloaded, Discharge Switch Turned
on
C
T
Pin Grounded, 0
v
T
J
v
85°C
C
T
Pin Grounded,
−40
v
T
J
v
125°C
I
CT
I
CT
V
CT(max)
V
CT(min)
C
CT
CT
delay
47.25
45.25
−
−
−
−
50
50
4.3
−
8
220
52.75
52.75
−
20
−
−
mA
mA
V
mV
pF
ns
IVC Current = 25
mA
(Including V
(offset)
)
IVC Current = 50
mA
(Including V
(offset)
)
V
(offset)
V
CT−25mA
V
CT−50mA
R
IVC
1.10
1.69
2.12
1.30
2.08
2.6
17
1.45
2.47
3.05
V
V
V
kW
Conditions
Symbol
Min
Typ
Max
Unit
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4
NCL30100
6.260
6.255
V
CC(on)
(V)
6.250
6.245
6.240
6.235
30
28
26
24
I
CC1
(mA)
−40
−20
0
20
40
60
80
100
120
22
20
18
16
14
12
10
−40
−20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 3. V
startup
Threshold vs. Junction
Temperature
5.780
5.775
5.770
V
CC(off)
(V)
5.765
5.760
5.755
5.750
5.745
−40
−20
0
20
40
60
80
TEMPERATURE (°C)
100
120
5.740
Figure 4. Startup Current Consumption vs.
Junction Temperature
12.6
12.5
12.4
12.3
I
CS(min)
(mA)
12.2
12.1
12.0
11.9
11.8
11.7
11.6
−40
−20
0
20
40
60
80
TEMPERATURE (°C)
100
120
Figure 5. Minimum Source Current vs.
Junction Temperature
1.10
50.0
49.5
1.05
I
CS(max)
(mA)
49.0
48.5
48.0
47.5
0.90
−40
47.0
−40
I
CC2
(mA)
Figure 6. Minimum Operating Voltage
Threshold vs. Junction temperature
1.00
0.95
−20
0
20
40
60
80
TEMPERATURE (°C)
100
120
−20
0
20
40
60
80
TEMPERATURE (°C)
100
120
Figure 7. Steady State Current Consumption
vs. Junction Temperature
Figure 8. Maximum Source Current vs.
Junction Temperature
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