Vicor Micro Family of DC-DC Converter - Manual (Page 41)

Design Guide & Applications Manual
For Maxi, Mini, Micro Family DC-DC Converters and Configurable Power Supplies
Maxi, Mini, Micro Design Guide Rev 4.9 vicorpower.com
Page 40 of 88
Apps. Eng. 800 927.9474 800 735.6200
8. Filter / Autoranging Rectifier Module (FARM)
*
Operating Power (W)
P
o
w
e
r
F
a
il
W
a
rn
in
g
T
im
e
(
m
s
)
0
5
10
15
20
25
30
35
40
1000 750 500 250
*
*
(FARM2XXX)
(FARM1XXX)
Figure 8–8 — Power fail warning time vs. operating power and
total bus capacitance, series combination of C1, C2 (Figure 8–3)
Operating Power (W)
R
id
e
-t
h
ro
u
g
h
T
im
e
(
m
s
)
0
10
20
30
40
50
60
70
80
90
100
90 Vac 115 Vac
1000 750 500 250
Total
capacitance
820 µF
Operating Power (W)
P
-P
R
ip
p
le
V
o
lt
a
g
e
(
V
a
c
)
0
5
10
15
20
25
30
2200 µF 1600 µF 1300 µF
1000 750 500 250
*
1100 µF 820 µF 680 µF
*
*
(FARM1XXX)
(FARM2XXX)
Figure 8–9 — Ride-through time vs. operating power
Figure 8–10 — Ripple voltage vs. operating power and bus
capacitance, series combination of C1, C2 (Figure 8–3)
Output Voltage
R
ip
p
le
R
e
je
c
ti
o
n
(
d
B
)
40
45
50
55
60
65
70
75
80
50 30 15 5 2
Figure 8–11 — Converter ripple rejection vs. output voltage (Typical)
205 V
190 V
Power Fail
Power Fail
Warning
Bus OK Converter
Shut down
Hold-up Time
254 V
Ride-Through Time
Ripple (V p-p)
π – θ θ
Figure 8–7 — General timing diagram of bus voltage following interruption of the AC mains