NCP3065, NCV3065
Up to 1.5 A Constant Current
Switching Regulator for LEDs
The NCP3065 is a monolithic switching regulator designed to
deliver constant current for powering high brightness LEDs. The
device has a very low feedback voltage of 235 mV (nominal) which is
used to regulate the average current of the LED string. In addition, the
NCP3065 has a wide input voltage up to 40 V to allow it to operate
from 12 Vac or 12 Vdc supplies commonly used for lighting
applications as well as unregulated supplies such as Lead Acid
batteries. The device can be configured in a controller topology with
the addition of an external transistor to support higher LED currents
beyond the 1.5 A rated switch current of the internal transistor. The
NCP3065 switching regulator can be configured in Step−Down
(Buck) and Step−Up (boost) topologies with a minimum number of
external components.
Features
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MARKING
DIAGRAMS
8
1
SOIC−8
D SUFFIX
CASE 751
3065
ALYWG
G
1
1
V3065
ALYWG
G
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Integrated 1.5 A Switch
Input Voltage Range from 3.0 V to 40 V
Low Feedback Voltage of 235 mV
Cycle−by−Cycle Current Limit
No Control Loop Compensation Required
Frequency of Operation Adjustable up to 250 kHz
Operation with All Ceramic Output Capacitors or No Output Capacitance
Analog and Digital PWM Dimming Capability
Internal Thermal Shutdown with Hysteresis
Automotive Version Available
Automotive and Marine Lighting
High Power LED Driver
Constant Current Source
Low Voltage LED Lighting
(Landscape, Path, Solar, MR16 Replacement)
+LED
Rs
8
1
NCP3065
AWL
YYWWG
NCV3065
AWL
YYWWG
PDIP−8
P, P1 SUFFIX
CASE 626
1
DFN−8
MN SUFFIX
CASE 488
A
L, WL
Y, YY
W, WW
G or
G
=
=
=
=
=
NCP
3065
ALYW
G
G
NCV
3065
ALYW
G
G
Applications
Assembly Location
Wafer Lot
Year
Work Week
Pb−Free Package
(Note: Microdot may be in either location)
0.15
W
V
in
NCP3065
NC SWC
I
pk
SWE
CT
V
in
COMP GND
V
th
= 0.235 V
C
in
220
mF
CT
2.2 nF
R
D
L
LED
Cluster
−LED
R
sense
0.68
W
D
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
C
out
22
mF
D
Figure 1. Typical Buck Application Circuit
©
Semiconductor Components Industries, LLC, 2009
May, 2009
−
Rev. 3
1
Publication Order Number:
NCP3065/D
NCP3065, NCV3065
Switch Collector
Switch Emitter
Timing Capacitor
GND
2
3
4
(Top View)
7
6
5
I
pk
Sense
V
CC
Comparator
Inverting
Input
Switch Emitter
Timing Capacitor
EP Flag
GND
(Top View)
Figure 2. Pin Connections
Figure 3. Pin Connections
NCP3065
8
N.C.
SET dominant
R
S
7
I
pk
Sense
COMPARATOR
−
+
0.2 V
6
+V
CC
COMPARATOR
+
5
Comparator Inverting Input
−
S
R
2
Q
Switch Emitter
SET dominant
OSCILLATOR
CT
0.235 V
REFERENCE
REGULATOR
3
Timing Capacitor
Q
TSD
1
Switch Collector
4
GND
Figure 4. Block Diagram
PIN DESCRIPTION
Pin No.
1
2
3
4
5
6
7
8
Pin Name
Switch Collector
Switch Emitter
Timing Capacitor
GND
Comparator
Inverting Input
V
CC
I
pk
Sense
N.C.
Internal Darlington switch collector
Internal Darlington switch emitter
Timing Capacitor Oscillator Input, Timing Capacitor
Ground pin for all internal circuits
Inverting input pin of internal comparator
Voltage supply
Peak Current Sense Input to monitor the voltage drop across an external resistor to limit the peak
current through the circuit
Pin not connected
Description
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2
Ç
Ç
Ç
Ç
ÇÇ
ÇÇ
ÇÇ
ÇÇ
Switch Collector
1
8
N.C.
N.C.
I
pk
Sense
V
CC
Comparator
Inverting
Input
NCP3065, NCV3065
MAXIMUM RATINGS
(measured vs. pin 4, unless otherwise noted)
Rating
V
CC
(Pin 6)
Comparator Inverting Input (Pin 5)
Darlington Switch Collector (Pin 1)
Darlington Switch Emitter (Pin 2) (Transistor OFF)
Darlington Switch Collector to Emitter (Pins 1−2)
Darlington Switch Current
I
pk
Sense (Pin 7)
Timing Capacitor (Pin 3)
Power Dissipation and Thermal Characteristics
PDIP−8
Thermal Resistance Junction−to−Air
SOIC−8
Thermal Resistance Junction−to−Air
DFN−8
Thermal Resistance Junction−to−Air
Thermal Resistance Junction−to−Case
Storage Temperature Range
Maximum Junction Temperature
Operating Junction Temperature Range (Note 3)
NCP3065, NCV3065
R
qJA
R
qJA
R
qJA
R
qJC
T
STG
T
J(MAX)
T
J
100
180
78
14
−65
to +150
+150
−40
to +125
°C/W
°C/W
°C/W
Symbol
V
CC
V
CII
V
SWC
V
SWE
V
SWCE
I
SW
V
IPK
V
TCAP
Value
0 to +40
−0.2
to +V
CC
0 to +40
−0.6
to +V
CC
0 to +40
1.5
−0.2
to V
CC
+ 0.2
−0.2
to +1.4
Unit
V
V
V
V
V
A
V
V
°C
°C
°C
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 series contains ESD protection and exceeds the following tests:
Pin 1−8: Human Body Model 2000 V per AEC Q100−002; 003 or JESD22/A114; A115
Machine Model Method 200 V
2. This device contains latch−up protection and exceeds 100 mA per JEDEC Standard JESD78.
3. The relation between junction temperature, ambient temperature and Total Power dissipated in IC is T
J
= T
A
+ R
q
•
P
D
4. The pins which are not defined may not be loaded by external signals
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3
NCP3065, NCV3065
ELECTRICAL CHARACTERISTICS
(V
CC
= 5.0 V, T
J
=
−40°C
to +125°C, unless otherwise specified)
Characteristic
OSCILLATOR
Frequency
Discharge to Charge Current Ratio
Capacitor Discharging Current
Capacitor Charging Current
Current Limit Sense Voltage
OUTPUT SWITCH
(Note 5)
Darlington Switch Collector to
Emitter Voltage Drop
Collector Off−State Current
COMPARATOR
Threshold Voltage
T
J
= 25°C
T
J
= 0 to +85°C
T
J
=
−40°C
to +125°C
Threshold Voltage Line Regulation
Input Bias Current
TOTAL DEVICE
Supply Current
(V
CC
= 5.0 V to 40 V,
CT = 2.2 nF, Pin 7 = V
CC
,
VPin 5 > V
th
, Pin 2 = GND,
remaining pins open)
I
CC
7.0
mA
(V
CC
= 3.0 V to 40 V)
(V
in
= V
th
)
V
TH
REG
LiNE
I
CII in
−10
−6.0
−1000
−100
V
TH
235
±5
+10
6.0
1000
mV
%
%
mV
nA
(I
SW
= 1.0 A,
T
J
= 25°C) (Note 5)
(V
CE
= 40 V)
V
SWCE(DROP)
I
C(OFF)
1.0
0.01
1.3
100
V
mA
(VPin 5 = 0 V, CT = 2.2 nF,
T
J
= 25°C)
(Pin 7 to V
CC
, T
J
= 25°C)
(Pin 7 to V
CC
, T
J
= 25°C)
(Pin 7 to V
CC
, T
J
= 25°C)
(T
J
= 25°C) (Note 6)
f
OSC
I
DISCHG
/
I
CHG
I
DISCHG
I
CHG
V
IPK(Sense)
165
110
5.5
150
6.0
1650
275
185
235
190
6.5
kHz
−
mA
mA
mV
Conditions
Symbol
Min
Typ
Max
Unit
Thermal Shutdown Threshold
Hysteresis
160
10
°C
°C
5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
6. The
V
IPK(Sense)
Current Limit Sense Voltage is specified at static conditions. In dynamic operation the sensed current turn−off value depends
on comparator response time and di/dt current slope. See the Operating Description section for details.
7. NCV prefix is for automotive and other applications requiring site and change control.
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4
NCP3065, NCV3065
450
400
350
FREQUENCY (kHz)
FREQUENCY (kHz)
190
180
170
160
150
140
130
120
110
C
T
= 2.2 nF
T
J
= 25°C
300
250
200
150
100
50
0
0 1 2 3 4 5 6 7 8 9 10 11 12 1314 1516 1718 1920
Ct, CAPACITANCE (nF)
3
7
12
16
21
25
29
34
38 40
V
CC
, SUPPLY VOLTAGE (V)
Figure 5. Oscillator Frequency vs. Oscillator
Timing Capacitor
2.4
2.2
VOLTAGE DROP (V)
2.0
1.8
1.6
1.4
1.2
1.0
−50
0
50
100
150
V
CC
= 5.0 V
I
E
= 1 A
VOLTAGE DROP (V)
1.25
1.20
1.15
1.10
1.05
1.0
−50
Figure 6. Oscillator Frequency vs. Supply
Voltage
V
CC
= 5.0 V
I
C
= 1 A
0
50
100
150
T
J
, JUNCTION TEMPERATURE (°C)
T
J
, JUNCTION TEMPERATURE (°C)
Figure 7. Emitter Follower Configuration Output
Darlington Switch Voltage Drop vs. Temperature
Figure 8. Common Emitter Configuration Output
Darlington Switch Voltage Drop vs. Temperature
2.0
1.9
1.8
VOLTAGE DROP (V)
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
V
CC
= 5.0 V
T
J
= 25°C
VOLTAGE DROP (V)
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
V
CC
= 5.0 V
T
J
= 25°C
0
0.5
1.0
1.5
0
0.5
1.0
1.5
I
E
, EMITTER CURRENT (A)
I
C
, COLLECTOR CURRENT (A)
Figure 9. Emitter Follower Configuration Output
Darlington Switch Voltage Drop vs. Emitter Current
Figure 10. Common Emitter Configuration
Output Darlington Switch Voltage Drop vs.
Collector Current
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