Instruction Manual

Design Guide & Applications Manual
F
or 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)
Power Fail Warning Time (ms)
0
5
1
0
15
20
25
30
35
40
1000
750500250
*
*
(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)
Ride-through Time (ms)
0
1
0
20
3
0
40
50
60
70
80
9
0
100
90 Vac 115 Vac
1000750500250
Total
capacitance
820 µF
Operating Power (W)
P-P Ripple Vol tage (Vac)
0
5
10
15
20
25
30
2200 µF1600 µF1300 µF
1000750500250
*
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
Ripple Rejection (dB)
40
45
50
55
60
65
70
75
80
50301552
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