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© Semiconductor Components Industries, LLC, 2009
May, 2009 − Rev. 3
1 Publication Order Number:
NCP3065/D
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
• 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
Applications
• Automotive and Marine Lighting
• High Power LED Driver
• Constant Current Source
• Low Voltage LED Lighting
(Landscape, Path, Solar, MR16 Replacement)
Figure 1. Typical Buck Application Circuit
NCP3065
V
in
C
in
220 mF
0.15 W
NC
I
pk
V
in
COMP
C
out
22 mF
V
th
= 0.235 V
2.2 nF
CT
D
D
D
+LED
L
LED
Cluster
−LED
R
sense
0.68 W
SWC
SWE
GND
CT
Rs
R
PDIP−8
P, P1 SUFFIX
CASE 626
http://onsemi.com
MARKING
DIAGRAMS
DFN−8
MN SUFFIX
CASE 488
SOIC−8
D SUFFIX
CASE 751
1
8
NCP3065
AWL
YYWWG
A = Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G or G = Pb−Free Package
(Note: Microdot may be in either location)
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
ORDERING INFORMATION
3065
ALYWG
G
1
1
8
NCP
3065
ALYW G
G
1
NCV3065
AWL
YYWWG
V3065
ALYWG
G
1
NCV
3065
ALYW G
G
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