Datasheet

UG-320 Evaluation Board User Guide
Rev. A | Page 28 of 48
CLOSED-LOOP FREQUENCY RESPONSE
A network analyzer (AP200) was used to test the bode plots of
the system. Jumper J18 was replaced by a 20 Ω resistor, and a
continuous noise signal of 400 mV was injected into the VS3+
pin before the voltage divider (R10 and R11 on daughter card).
The operating condition was 385 V dc input and a load
condition of 25 A.
38
30
22
14
6
–2
–10
–18
–26
–34
–42
180
140
100
60
20
–20
–60
–100
–140
–180
–220
100 1k 10k 100k
FREQUENCY (Hz)
MAGNITUDE [B/A] (dB)
PHASE [B – A] (Degrees)
10180-064
PHASE
GAIN
Figure 65. Bode Plots, 25 A Load, 385 V DC
Crossover Frequency = 7.36 kHz
Phase Margin = 62.8°
Gain Margin = 17 dB
EFFICIENCY
92.3
92.2
92.1
92.0
91.9
91.8
91.7
91.6
91.5
91.4
350 355 360 365 370 375 380 385 390 395 400
V
IN
(V DC)
EFFICIENCY (%)
10180-065
EFFICIENCY AT 25A
Figure 66. Efficiency vs. V
IN
100
90
80
70
60
50
40
30
20
10
0
0 5 10 15 20 25
LOAD (A)
EFFICIENCY (%)
10180-066
385V DC
350V DC
Figure 67. Efficiency vs. Load
100
90
80
70
60
50
40
30
20
10
0
0 5 10 15 20 25
LOAD (A)
EFFICIENCY (%)
10180-067
385VDC LIGHT LOAD ENABLED
385VDC LIGHT LOAD DISABLED
Figure 68. Efficiency vs. Load (with and Without Light Load Mode)
CS1 LINEARITY
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
MEASUREMENT INPUT CURRENT (A)
GUI REPORTED CURRENT (A)
10180-068
350V DC
385V DC
Figure 69. CS1 Linearity