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Número de pieza | NCP3066 | |
Descripción | Up to 1.5 A Constant Current Switching Regulator | |
Fabricantes | ON Semiconductor | |
Logotipo | ||
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No Preview Available ! NCP3066, NCV3066
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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
Rsense
VCC
CIN
GND
Ç ÇÇON/OFF
SWC
Ç ÇÇIpk SWE
NCP3066
Ç ÇÇVCC
CT
ÇÇ ÇÇÇÇCOMP
GND
CT
L1
COUT
D1
Figure 1. Typical Buck Application Circuit
LED+
LED1
LEDn
LED−
Rs
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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
January, 2009 − Rev. 3
1
Publication Order Number:
NCP3066/D
1 page NCP3066, NCV3066
350
300
250
200
150
100
50
0
0
2 4 6 8 10 12 14 16
Ct, CAPACITANCE (nF)
Figure 5. Oscillator Frequency vs.
Timing Capacitor
18
20
150 www.DataSheet4U.com
145
140
135
130
125
120
0
5 10 15 20 25 30 35
VIN, INPUT VOLTAGE (V)
Figure 6. Oscillator Frequency vs. Supply
Voltage
40
2.3
ICE = 1.25 A
2.1
ICE = 1 A
1.9
ICE = 0.75 A
1.7
1.5
1.3 ICE = 0.5 A
1.1
ICE = 0.25 A
0.9
−40 −20 0 20 40 60 80 100 120
TJ, JUNCTION TEMPERATURE (°C)
Figure 7. Voltage Drop in Emitter Follower
Configuration
140
1.3
1.2
ICE = 1.25 A
1.1 ICE = 1 A
1.0 ICE = 0.75 A
0.9
0.8
ICE = 0.5 A
0.7
ICE = 0.25 A
0.6
−40 −20 0
20 40 60 80 100 120 140
TJ, JUNCTION TEMPERATURE (°C)
Figure 8. Common Emitter Configuration Output
Darlington Switch Voltage Drop vs. Temperature
0.240
0.200
0.238
0.236
0.234
0.232
0.195
0.190
0.185
0.180
0.175
0.230
−40 −20 0 20 40 60 80 100 120 140
TJ, JUNCTION TEMPERATURE (°C)
Figure 9. Vth vs. Temperature
0.170
−40 −20 0 20 40 60 80 100 120 140
TJ, JUNCTION TEMPERATURE (°C)
Figure 10. Current Limit Sense Voltage vs.
Temperature
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5
5 Page NCP3066, NCV3066
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Figure 16. Buck with External Switch Demoboard Layout
Figure 17. Buck with External Switch Demoboard
Photo
90
350 mA 4 LED
85 (Vout = 12.8 V)
80 700 mA 4 LED
(Vout = 12.8 V)
75
70 700 mA 2 LED
65 (Vout = 6.4 V)
60 350 mA 2 LED
55 (Vout = 6.4 V)
50
10
95
15 20
25 30
INPUT VOLTAGE (V)
Figure 18. Efficiency of Buck LED Driver
35
90
85 3 A 4 LED
80 (Vout = 12.8 V)
75
70
65
3 A 2 LED
(Vout = 6.4 V)
60
55
10 15 20 25 30 35
INPUT VOLTAGE (V)
Figure 19. Efficiency of Buck LED Driver at Iout = 3 A
Figure 15, Buck Demoboard With External Switch
Application Schematic illustrates the NCP3066 being used
as a PFET controller. Table 1. Bill Of Materials shows the
small number of additional parts which are necessary to
assemble mentioned demoboard. The demoboard based on
two layer PCB and the layout is mentioned in Figure 16.
Buck Demoboard Layout. The Line regulation is mentioned
in Figure 20, Line Regulation. The Figure 21, Dimming
characteristic shows behavior of circuitry in case the square
wave signal with 5 V amplitude and 300 Hz frequency was
delivered into ON/OFF pin of device.
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11
11 Page |
Páginas | Total 20 Páginas | |
PDF Descargar | [ Datasheet NCP3066.PDF ] |
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