Rev 6.7

vicorpower.com

Page 9 of 11

06/2015

800 927.9474

FARMxxxx

Output Voltage

40

45

50

55

60

65

70

75

80

50

30

15

5

2

Figure 17 — Converter ripple rejection vs. output voltage (typical)

APPLICATION NOTE (CONT.)

*

Operating Power (W)

0

5

10

15

20

25

30

35

40

1000

750

500

250

*

*

(FARM2XXX)

(FARM1XXX)

Figure 14 — Power fail warning time vs. operating power

and total bus capacitance, series combination of

C1, C2 (see Fig. 9)

Operating Power (W)

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 16 — Ripple voltage vs. operating power and bus

capacitance, series combination of C1, C2

(see Fig. 9)

Operating Power (W)

0

10

20

30

40

50

60

70

80

90

100

90 Vac

115 Vac

1000

750

500

250

Total

capacitance

820

μF

Figure 15 — Ride-through time vs. operating power

Figure 13 — Hold-up time

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 – θθ