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NCL30000DR2G

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NCL30000
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Performance Data for 90 to 305 Vac LED Driver
Shown below in Figure 31 is the line regulation and
efficiency with a 36.9 V, 12 LED load. Note the output
current does not vary much over the entire input voltage
range. The data is based on the use of an EFD25 transformer.
300
305
310
315
320
325
330
335
340
345
350
90 115 140 165 190 215 240 265 290 315
Input Voltage (Vac)
LED Current (mA)
77%
78%
79%
80%
81%
82%
83%
84%
85%
86%
87%
Efficiency (%)
LED Current
Efficiency
Figure 31. Output Current and Efficiency with 36.9 V Load
Power factor and Total Harmonic Distortion are shown in Figure 32 below.
0
2
4
6
8
10
12
14
16
18
20
90 115 140 165 190 215 240 265 290 315
Input Voltage (Vac)
Input Current THD (%)
0.90
0.91
0.92
0.93
0.94
0.95
0.96
0.97
0.98
0.99
1.00
Power Factor (PF)
THD
PF
Figure 32. THD and Power Factor with 36.9 V Load
NCL30000
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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
340
350
360
370
380
12 17 22 27 32 37 42 47 52 57
LED Forward Voltage (Vdc)
LED Current (mA)
74%
76%
78%
80%
82%
84%
86%
Efficiency
115V LED Current
230V LED Current
115V Efficiency
230V Efficiency
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
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
20
25
30
35
40
45
50
55
60
0 100 200 300 400 500 600 700 800 900 1000
LED Current (mA)
LED Forward Voltage (Vdc)
Figure 34.
Protection
Region
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Figure 35 shows output ripple current for 115 Vac input
and 36.9 (12 LED) load operating at 350 mA average. Scale
factor is 67 mA per division. The low frequency ripple
follows the input twice line frequency rectified sine wave
characteristic of single stage converters.
Figure 35. Output Ripple at 115 Vac and 36.9 V,
350 mA Load
Figure 36 shows output ripple current at the main
switching frequency. Scale factor is 33 mA per division.
This is the signal superimposed over the rectified sine wave
ripple component.
Figure 36. Output Ripple at 115 Vac and 36.9 V,
350 mA Load
Initial start up characteristic is shown in Figure 37 below.
Note the higher current limit controlled by the fast feedback
loop and the transition to the main average mode feedback
control loop. This shows start up at 115 Vac with 36.9 V,
350 mA load. Trace 2 is LED current at 167 mA per division
and trace 3 is applied input voltage at 200 V per division.
Figure 37. Start up Characteristic with 36.9 V, 350 mA
Load
Typical voltage stress on power FET with 36.9 V, 350 mA
load and 305 Vac input voltage is shown in Figure 38. Scale
factor is 100 V per division.
Figure 38. Drain to Source Voltage with 36.9 V,
350 mA Load at 305 Vac Input
Note that while the power supply was designed to meet
agency requirements, it has not been submitted for
compliance. Standard safety practices should be used when
this circuit is energized and in particular when connecting
test equipment. During evaluation, input power should be
sourced through an isolation transformer.
Additional Application Information and Tools
An evaluation board is available for this 90 − 305 Vac
design example. Moreover, for applications where it is
desired to dim the LEDs via a TRIAC dimmer, please refer
to Application Note AND8448 which explains the steps
necessary to configure the NCL30000 for TRIAC dimming.
In addition there are two additional TRIAC dimmable
reference designs which illustrate a complete design for
90 − 135 Vac or 180 − 265 Vac operation. There is also an
Microsoft EXCEL spreadsheet tool available to aid in the
design process and assist in developing target winding
requirements for the transformer.
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NCL30000DR2G

Mfr. #:
Buy NCL30000DR2G
Manufacturer:
ON Semiconductor
Description:
LED Lighting Drivers PFC Dimmable LED Driver
Lifecycle:
New from this manufacturer.
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