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CUI Inc

│ SERIES: VFB400W │ DESCRIPTION: DC-DC CONVERTER

date 01/30/2014

│ page 2 of 10

INPUT

parameter

conditions/description

min

typ

max

units

operating input voltage

24 Vdc input models

48 Vdc input models

9

18

24

48

36

75

Vdc

Vdc

under voltage shutdown

24 Vdc input

power up

power down

8.5

7.5

Vdc

Vdc

48 Vdc input

power up

power down

17

15

Vdc

Vdc

over voltage shutdown

24 Vdc input

power up

power down

40

42

Vdc

Vdc

48 Vdc input

power up

power down

80

83

Vdc

Vdc

start-up time

250

ms

CTRL

positive logic

models ON (0~0.01 mA)

models OFF (1.0~10 mA)

negative logic

models ON (1.0~10 mA)

models OFF (0~0.01 mA)

filter

pifilter

input fuse

80A time delay fuse for 24 Vin models,

40A time delay fuse for 48 Vin models

OUTPUT

parameter

conditions/description

min

typ

max

units

5V output models

12V output models

24V and 28V output models

48V output models

680

330

330

100

10,000

10,000

4,700

2,200

μF

μF

μF

μF

from low line to high line

±0.2

%

from full load to no load

±0.5

%

±1.5

%

from 50~100% load

±10

%

adjustability

80

110

%

switchingfrequency

230

KHz

transient response

25% load step change

500

μs

temperaturecoefficient

±0.03

%/°C

power good (IOC)

Vout ready: low level, sink current

Vout not ready: open drain output, applied voltage

20

50

mA

V

auxiliary output voltage/current 10 ±3 Vdc, 20 mA max.

Note:

1.Minimumcapacitorvaluesarerequiredontheoutputtomaintainthespecifiedregulation.

2. Excludes 5 Vdc output models.

PROTECTIONS

parameter

conditions/description

min

typ

max

units

short circuit protection

continuous

over current protection

110

150

%

over voltage protection

115

140

%

over temperature protection

shutdown

110

°C

For more information, please visit the product page.