NCP3066 ON Semiconductor, NCP3066 Datasheet - Page 16

• Manufacturer Part Number: NCP3066
• Description: Up to 1.5A Constant Current Switching Regulator
• Manufacturer: ON Semiconductor

illustrates the basic circuitry in buck topology, which allows
supplying one or two LEDs up to 350 mA consumption. The
TABLE 5 BILL OF MATERIALS shows the small number
of additional parts which are necessary to assembly
Table 6. TEST RESULTS
Line Regulation
Output Ripple
Efficiency
The Figure 27 Buck demoboard Application schematic
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
5
Figure 28. Buck Demoboard Layout
10
Figure 30. Line Regulation
15
INPUT VOLTAGE (V)
1 LED 350 mA
1 LED 100 mA
20
Vin = 8 V to 20 V, Vout = 3.2 V, Iout = 350 mA
Vin = 8 V to 20 V, Vout = 3.2 V, Iout = 350 mA
Vin = 12 V, Vout = 3.2 V, Iout = 350 mA
25
30
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35
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mentioned demoboard. The demoboard based on one layer
PCB and the layout is mentioned in Figure 28 Buck
Demoboard Layout. The Line regulation is mentioned in
Figure 30 Line Regulation. The Figure 31 shows efficiency
of Buck LED Driver.
80
75
70
65
60
55
50
45
40
35
30
5
Figure 29. Buck Demonstration Photo
Figure 31. Efficiency of Buck LED Driver
10
2 LED 350 mA
INPUT VOLTAGE (V)
15
1 LED 100 mA
20
1 LED 350 mA
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2 LED 100 mA
25
19 mA
32 mA
62%
30
35