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NCL30000
Load regulation from 12.3 to 52.5 (4 to 15 LEDs) for 115
and 230 Vac input is shown below in Figure 4. Efficiency for
this range is also shown. Note the tight regulation.
380
370
360
350
340
Efficiency is affected by the startup circuit losses in
proportion to load and influenced by higher line voltage.
86%
84%
82%
80%
78%
115V LED Current
330
230V LED Current
115V Efficiency
230V Efficiency
76%
320
12
17
22
27 32 37 42
LED Forward Voltage (Vdc)
47
52
57
74%
Figure 33. LED Current and Efficiency at 115 and 230 Vac
Figure 34 shows the current regulation as a function of
output voltage (LED forward voltage). The control loop has
been designed to support 4 ? 15 LED based on a forward
voltage that ranged from 2.6 ? 3.5 V. The maximum on time
of the control loop has been configured to limit the
60
55
50
45
40
35
30
25
20
15
10
5
0
maximum power delivered. This is illustrated at the top of
the output voltage-current transfer function. At the bottom
of the curve, even with a short applied to the output, the
current is limited to less than 1 A.
Protection
Region
0
100
200
300
400 500 600
700
800
900
1000
LED Current (mA)
Figure 34.
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