On Semiconductor NCL30000 Evaluation Board NCL30000LED1GEVB NCL30000LED1GEVB Fiche De Données

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.

Efficiency is affected by the startup circuit losses in
proportion to load and influenced by higher line voltage.

320

330

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380

12

17

22

27

32

37

42

47

52

57

74%

76%

78%

80%

82%

84%

86%

115V LED Current
230V LED Current
115V Efficiency
230V Efficiency

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

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.

0

5

10

15

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25

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35

40

45

50

55

60

0

100

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