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Performance Data and Typical Characteristic Curves
7
Performance Data and Typical Characteristic Curves
Figure 4
through
Figure 8
Cree XRE LED's at 900 mA.
EFFICIENCY/POWER FACTOR
1.00
0.98
0.96
0.94
0.92
Efficiency
0.90
0.88
80
100 120 140
V
RMS
7.1
Transient
TRANSITION MODE BUCK PWM RESPONSE
(Ch1 and Ch 4 share GND reference)
Ch3:
LED Current
Ch1:
Buck V
IN
Ch4:
LED Voltage
0.5 A/div.
Ch2:
Buck V
DS
10
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications
present some typical performance curves for the UCC28810EVM-002 with 30
vs
LINE VOLTAGE
Power Factor
160 180
200 220
240
- Line Voltage - V
Figure 4.
Figure 6.
TOTAL HARMONIC DISTORTION
12
10
8
6
4
2
0
260
80
100 120 140
TRANSITION MODE BUCK PWM RESPONSE EXPANDED
Ch1:
Buck V
IN
Ch4:
LED Voltage
0.5 A/div.
Ch2:
Buck V
DS
Ch3: LED
Current
vs
LINE VOLTAGE
160 180
200 220
V
- Line Voltage - V
RMS
Figure 5.
(Ch1 and Ch4 share GND reference)
Figure 7.
SLUU355A – March 2009 – Revised June 2009
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240
260
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