Additional Resources: Product Page | 3D Model
date 12/17/2013
page 1 of 8
SERIES: VFK600 DESCRIPTION: DC-DC CONVERTER
FEATURES
up to 700 W isolated output
rugged metal enclosure with integrated heat sink
2:1 input range (18~36 Vdc, 36~75 Vdc)
single output from 12~48 Vdc
1,500 Vdc isolation
over current, over temperature, over voltage,
and short circuit protections
remote on/off
N+1 current sharing
efficiency up to 92%
input output output output ripple efficiency
MODEL
1
voltage voltage current power and noise
range max max max typ
(Vdc) (Vdc) (A) (W) (mVp-p) (%)
VFK600-D24-S12 18 ~ 36 12 50 600 120 89
VFK600-D24-S24 18 ~ 36 24 25 600 240 91
VFK600-D24-S28 18 ~ 36 28 21.5 600 280 90
VFK600-D24-S32 18 ~ 36 32 19 608 320 91
VFK600-D24-S48 18 ~ 36 48 12.5 600 480 92
VFK600-D48-S12 36 ~ 75 12 50 600 120 90
VFK600-D48-S24 36 ~ 75 24 25 600 240 91
VFK600-D48-S28 36 ~ 75 28 25 700 280 91
VFK600-D48-S32 36 ~ 75 32 19 608 320 92
VFK600-D48-S48 36 ~ 75 48 12.5 600 480 92
Notes: 1. Ripple and noise are measured at full load, 20 MHz BW with 10F tantalum capacitor and 1F ceramic capacitor across output
PART NUMBER KEY
VFK600 - DXX - SXX
Base Number Output Voltage
Input Voltage
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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
24 Vdc input models 18 24 36 Vdc
operating input voltage
48 Vdc input models 36 48 75 Vdc
24 Vdc input models, Vin = 18 Vdc, full load 37.7 A
input current
48 Vdc input models, Vin = 36 Vdc, full load 21.7 A
power up 16 17 18 Vdc
24 Vdc input
power down 15 16 17 Vdc
under voltage shutdown
power up 34 35 36 Vdc
48 Vdc input
power down 32 33 34 Vdc
power up 38 Vdc
24 Vdc input
power down 40 Vdc
over voltage shutdown
power up 77 Vdc
48 Vdc input
power down 80 Vdc
models ON (3.5~7.5 Vdc or open circuit)
1
CTRL positive logic
models OFF (0~0.7 Vdc)
60 A time delay fuse for 24 Vin models,
input fuse
30 A time delay fuse for 48 Vin models
filter pi filter
Note: 1. Open collector refer to -Vin.
OUTPUT
parameter conditions/description min typ max units
12 V output models 470 10,000 F
maximum capacitive load
24~48 V output models 470 5,000 F
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 %
48 V input, 12/28/32 V output models 300 kHz
switching frequency
all other models 250 kHz
transient response 25% step load change 500 s
temperature coefficient 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
for 1 minute: input to output; input to case;
isolation voltage 1,500 Vdc
output to case
isolation resistance 10 M
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