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