Datasheet

NCP3066, NCV3066
http://onsemi.com
16
Figure 28. Buck Demoboard Layout
Figure 29. Buck Demonstration Photo
The Figure 27 Buck demoboard Application schematic
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
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.
Figure 30. Line Regulation Figure 31. Efficiency of Buck LED Driver
INPUT VOLTAGE (V) INPUT VOLTAGE (V)
302520 3515105
0
0.05
0.10
0.15
0.20
0.25
0.35
0.40
205
30
40
45
55
60
70
75
80
OUTPUT CURRENT (mA)
EFFICIENCY (%)
0.30
65
50
35
1 LED 100 mA
2 LED 100 mA
1 LED 350 mA
2 LED 350 mA
1 LED 100 mA
1 LED 350 mA
10 15 3025 35
Table 6. TEST RESULTS
Line Regulation Vin = 8 V to 20 V, Vout = 3.2 V, Iout = 350 mA 19 mA
Output Ripple Vin = 8 V to 20 V, Vout = 3.2 V, Iout = 350 mA 32 mA
Efficiency Vin = 12 V, Vout = 3.2 V, Iout = 350 mA 62%