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NCP3065 Datasheet PDF : 18 Pages
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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 1.5ĂA 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
•ăIntegrated 1.5 A Switch
•ăInput Voltage Range from 3.0 V to 40 V
•ăLow Feedback Voltage of 235 mV
•ăCycle-by-Cycle Current Limit
•ăNo Control Loop Compensation Required
•ăFrequency of Operation Adjustable up to 250 kHz
•ăOperation with All Ceramic Output Capacitors or No Output Capacitance
•ăAnalog and Digital PWM Dimming Capability
•ăInternal Thermal Shutdown with Hysteresis
•ăAutomotive Version Available
Applications
•ăAutomotive and Marine Lighting
•ăHigh Power LED Driver
•ăConstant Current Source
•ăLow Voltage LED Lighting
(Landscape, Path, Solar, MR16 Replacement)
Rs
0.15 W
Vin
NCP3065
NC SWC
Ipk SWE
Vin CT
FB GND
Vth = 0.235 V
Cin
220 mF
L
R
D
Cout
22 mF
CT
2.2 nF
+LED
D
LED
Cluster
D
-LED
Rsense
0.68 W
http://onsemi.com
8
1
SOIC-8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
3065
ALYWG
G
1
8
1
PDIP-8
P, P1 SUFFIX
CASE 626
NCP3065
AWL
YYWWG
8
1
DFN-8
MN SUFFIX
CASE 488
3065
ALYW G
G
NCP3065
A
L, WL
Y, YY
W, WW
G or G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb-Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
Figure 1. Typical Buck Application Circuit
©Ă Semiconductor Components Industries, LLC, 2007
1
July, 2007 - Rev. 0
Publication Order Number:
NCP3065/D
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