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CUI Inc │ SERIES: VFK600 │ DESCRIPTION: DC-DC CONVERTER date 12/17/2013 │ page 2 of 8
INPUT
parameter conditions/description min typ max units
operating input voltage 24 Vdc input models
48 Vdc input models
18
36
24
48
36
75
Vdc
Vdc
input current 24 Vdc input models, Vin = 18 Vdc, full load
48 Vdc input models, Vin = 36 Vdc, full load
37.7
21.7
A
A
under voltage shutdown
24 Vdc input power up
power down
16
15
17
16
18
17
Vdc
Vdc
48 Vdc input power up
power down
34
32
35
33
36
34
Vdc
Vdc
over voltage shutdown
24 Vdc input power up
power down
38
40
Vdc
Vdc
48 Vdc input power up
power down
77
80
Vdc
Vdc
CTRL1positive logic models ON (3.5~7.5 Vdc or open circuit)
models OFF (0~0.7 Vdc)
input fuse 60 A time delay fuse for 24 Vin models,
30 A time delay fuse for 48 Vin models
lter pi lter
Note: 1. Open collector refer to -Vin.
OUTPUT
parameter conditions/description min typ max units
maximum capacitive load 12 V output models
24~48 V output models
470
470
10,000
5,000
μF
μF
line regulation measured from low line to high line ±0.2 %
load regulation measured from zero load to full load ±0.5 %
voltage accuracy ±1.5 %
load share accuracy 50~100% load ±10 %
adjustability 60 110 %
switching frequency 48 V input, 12/28/32 V output models
all other models
300
250
kHz
kHz
transient response 25% step load change 500 µs
temperature coefcient ±0.03 %/°C
PROTECTIONS
parameter conditions/description min typ max units
short circuit protection continuous
over current protection % nominal output current 110 150 %
over voltage protection %Vo 115 140 %
over temperature protection shutdown 110 °C
SAFETY AND COMPLIANCE
parameter conditions/description min typ max units
isolation voltage for 1 minute: input to output; input to case;
output to case 1,500 Vdc
isolation resistance 10 MΩ
RoHS 2011/65/EU (CE)
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