NCP3066 Datasheet, PDF (1/20 Pages) ON Semiconductor – Up to 1.5 A Constant Current Switching Regulator for LEDs with ON/OFF Function

NCP3066, NCV3066
Up to 1.5 A Constant
Current Switching
Regulator for LEDs with
ON/OFF Function
The NCP3066 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
NCP3066 has a wide input voltage up to 40 V to allow it to operate
from a 12 Vac or a 12−36 Vdc supply, commonly used for lighting
applications as well as unregulated supplies such as rechargeable
batteries. The NCP3066 switching regulator can be configured in
Step−Down (Buck), Step−Up (Boost) and Voltage−Inverting
topologies with a minimum number of external components. The
ON/OFF pin provides PWM dimming capability or a low power
shutdown mode.
Features
• Integrated 1.5 A Switch
• Input Voltage Range from 3.0 V to 40 V
• Logic Level Shutdown Capability
• Low Feedback Voltage of 235 mV
• Cycle−by−Cycle Current Limit
• No Control Loop Compensation Required
• Frequency of Operation Adjustable up to 250 kHz
• Analog and Digital PWM Dimming Capability
• Internal Thermal Shutdown with Hysteresis
• NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
• These are Pb−Free Devices
Applications
• Automotive and Marine Lighting
• Constant Current Source, High Brightness LED Driver
• Low Voltage and Landscape Lighting
ON/OFF
R_sense
V_CC
C_IN
GND
Ç ÇÇ _ON/OFF
SWC
Ç ÇÇ _Ipk
SWE
NCP3066
Ç ÇÇ _VCC
CT
ÇÇ ÇÇÇÇ _COMP
GND
C_T
L₁
C_OUT
D₁
Figure 1. Typical Buck Application Circuit
LED+
LED₁
LED_n
LED−
R_s
http://onsemi.com
MARKING
DIAGRAMS
8
1
SOIC−8
D SUFFIX
CASE 751
3066
ALYWG
G
1
NCP3066
AWL
YYWWG
8
1
PDIP−8
P, P1 SUFFIX
CASE 626
3066
ALYWG
G
1
DFN8
MN SUFFIX
CASE 488AF
NCP3066
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 17 of this data sheet.
© Semiconductor Components Industries, LLC, 2009
1
January, 2009 − Rev. 3
Publication Order Number:
NCP3066/D