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NCP3066, NCV3066
95
Figure 23. Boost Demoboard Layout
Figure 24. Boost Demonstration Photo
Figure 22, Boost Demoboard Application Schematic,
90
85
80
75
70
65
150 mA 6 LED
(19.2 V)
150 mA 8 LED
(25.6 V)
illustrates the basic circuitry in boost topology, which allows
supplying string up to eight LEDs up to 150 mA
consumption. Table 3, 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 shown in Figure 23, Buck Demoboard
Layout. The photo of this demoboard is mentioned in
Figure 24, Boost Demoboard Photo. Figure 26, 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. There was tested eight
60
5
7 9 11 13 15 17
INPUT VOLTAGE (V)
Figure 25. Boost LED Driver Efficiency
19
LEDs string with 150 mA consumption and V IN = 10 V at
room temperature.
The efficiency of this demoboard is mentioned in
Figure 25. Efficiency of Boost LED Driver.
3.50
3.0
2.50
2.0
1.50
1.0
0.50
0
0
10
20
30
40
50
60
70
80
90
100
ON/OFF DUTY CYCLE (%)
Figure 26. Dimming Characteristic
Table 4. TEST RESULTS
Line Regulation
Output Ripple
Efficiency
Vin = 10 V to 20 V, Vout = 19.2 V, Iout = 350 mA
Vin = 10 V to 20 V, Vout = 19.2 V, Iout = 350 mA
Vin = 12 V, Vout = 19.2 V, Iout = 350 mA
http://onsemi.com
14
25 mA
55 mA
85%
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