Efficiency
testing and measurements
UM2170
10/24
DocID030279 Rev 1
3
Efficiency testing and measurements
3.1
Efficiency, power factor, THD, LED current and current
regulation
Table 1: Test conditions
Test conditions
Devices
Input voltage: 185-275 V
AC
, 50 Hz
LED load: 32 V, 322 mA±1%
AC source: Agilent 6812B
Power analyzer: Yokogaba -WT310
Figure 8: STEVAL-ILL082V1 test setup
Table 2: Test results
Vin
(V)
Pin
(W)
Po
(W)
Efficiency
(%)
PF
THD
(%)
LED
current
Current regulation
(%)
185
12.19
10.28
84.35
0.98 11.50
325.00
0.87
200
12.13
10.24
84.42
0.99 5.10
324.18
0.61
205
12.10
10.21
84.38
0.99 4.00
323.46
0.39
210
12.08
10.19
84.34
0.99 4.20
322.80
0.18
220
12.03
10.15
84.34
0.99 6.00
321.40
-0.25
230
12.04
10.14
84.24
0.99 8.60
321.00
-0.37
250
12.03
10.10
83.97
0.98 13.00
320.19
-0.63
275
12.11
10.12
83.57
0.97 17.30
320.65
-0.48
