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7
Performance Data and Typical Characteristic Curves
80
100 120 140
200 220
260
V
RMS
- Line Voltage - V
0.88
0.98
1.00
160 180
240
0.92
0.94
P
F
-
P
o
w
e
r
F
a
c
to
r
a
n
d
E
ff
ic
ie
n
c
y
-
%
EFFICIENCY/POWER FACTOR
vs
LINE VOLTAGE
Efficiency
Power Factor
0.90
0.96
0
2
4
10
12
6
8
T
H
D
-
T
o
ta
l
H
a
rm
o
n
ic
D
is
to
rt
io
n
-
%
80
100 120 140
200 220
260
V
RMS
- Line Voltage - V
160 180
240
TOTAL HARMONIC DISTORTION
vs
LINE VOLTAGE
7.1
Transient
Ch2:
Buck V
DS
Ch4:
LED Voltage
0.5 A/div.
Ch3:
LED Current
Ch1:
Buck V
IN
TRANSITION MODE BUCK PWM RESPONSE
(Ch1 and Ch 4 share GND reference)
Ch2:
Buck V
DS
Ch4:
LED Voltage
0.5 A/div.
Ch3: LED
Current
Ch1:
Buck V
IN
TRANSITION MODE BUCK PWM RESPONSE EXPANDED
(Ch1 and Ch4 share GND reference)
Performance Data and Typical Characteristic Curves
www.ti.com
Figure 4
through
Figure 8
present some typical performance curves for the UCC28810EVM-002 with 30
Cree XRE LED’s at 900 mA.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications
10
SLUU355A – March 2009 – Revised June 2009
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