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PRELIMINARY

Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715

ENMods System: FARM3 and MiniHAM

Rev. 1.3

Page 9 of 12

Output Voltage

40

45

50

55

60

65

70

75

80

50

30

15

5

2

Figure 17—Converter ripple rejection vs. output voltage

*

Operating Power (W)

0

5

10

15

20

25

30

35

40

2200

µF

1600

µF

1300

µF

500

250

1100

µF

820

µF

680

µF

*

Figure 14—Hold-up time vs. operating power and total bus

capacitance, series combination of C1, C2 (see Figure 1a)

Operating Power (W)

0

5

10

15

20

25

30

2200

µF

1600

µF

1300

µF

500

250

*

1100

µF

820

µF

680

µF

*

Figure 16—Ripple voltage vs. operating power and bus

capacitance, series combination of C1, C2 (see Figure 1a)

Operating Power (W)

0

10

20

30

40

50

60

70

80

90

100

90Vac

115Vac

500

250

Total

capacitance

820

µF

Figure 15—Ride-through time vs. operating power

Figure 13—Hold-up time

π – θθ

205V

185V

Power

Fail

Power Fail

Warning

B OK

Converter

Shutdown

Hold-up Time

254V

Ride-Thru Time

Ripple (V p-p)

Application Note (continued)

N

EMI GND

SR

L

+

BOK

ST

EN

–

Micro-

controller

15 Vdc

27k

Ω

+5 Vdc

Secondary

referenced

FARM3

Figure 12—Bus OK (BOK) isolated power status indicator

+In

PC (Gate In)

PR (Gate Out)

–In

N

EMI GND

SR

L

+

B OK

ST

EN

–

150k

15Vdc

Vicor DC-DC

Converter

Micro-

controller

FARM3

Figure 11—Enable (EN) function