VFK600 [CUI]
DC-DC CONVERTER;
CUI INC 
For more information, please visit the product page.
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
voltage
range
output
voltage
output
current
max
output
power
max
ripple
efficiency
MODEL
and noise1
max
typ
(Vdc)
(Vdc)
12
24
28
32
48
12
24
28
32
48
(A)
(W)
(mVp-p)
(%)
VFK600-D24-S12
VFK600-D24-S24
VFK600-D24-S28
VFK600-D24-S32
VFK600-D24-S48
VFK600-D48-S12
VFK600-D48-S24
VFK600-D48-S28
VFK600-D48-S32
VFK600-D48-S48
18 ~ 36
18 ~ 36
18 ~ 36
18 ~ 36
18 ~ 36
36 ~ 75
36 ~ 75
36 ~ 75
36 ~ 75
36 ~ 75
50
25
600
600
600
608
600
600
600
700
608
600
120
240
280
320
480
120
240
280
320
480
89
91
90
91
92
90
91
91
92
92
21.5
19
12.5
50
25
25
19
12.5
Notes:
1. Ripple and noise are measured at full load, 20 MHz BW with 10µF tantalum capacitor and 1µF 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
48 Vdc input models
18
36
24
48
36
75
Vdc
Vdc
operating input voltage
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
power up
24 Vdc input
16
15
17
16
18
17
Vdc
Vdc
power down
under voltage shutdown
power up
48 Vdc input
34
32
35
33
36
34
Vdc
Vdc
power down
power up
24 Vdc input
38
40
Vdc
Vdc
power down
over voltage shutdown
CTRL1
power up
48 Vdc input
77
80
Vdc
Vdc
power down
models ON (3.5~7.5 Vdc or open circuit)
models OFF (0~0.7 Vdc)
positive logic
60 A time delay fuse for 24 Vin models,
30 A time delay fuse for 48 Vin models
input fuse
filter
pi filter
Note:
1. Open collector refer to -Vin.
OUTPUT
parameter
conditions/description
min
typ
max
units
12 V output models
24~48 V output models
470
470
10,000
5,000
μF
μF
maximum capacitive load
line regulation
load regulation
voltage accuracy
load share accuracy
adjustability
measured from low line to high line
measured from zero load to full load
±0.2
±0.5
±1.5
%
%
%
%
%
50~100% load
±10
60
110
500
48 V input, 12/28/32 V output models
all other models
300
250
kHz
kHz
switching frequency
transient response
25% step load change
µs
temperature coefficient
±0.03
%/°C
PROTECTIONS
parameter
conditions/description
continuous
min
typ
max
units
short circuit protection
over current protection
over voltage protection
over temperature protection
% nominal output current
%Vo
110
115
150
140
%
%
°C
shutdown
110
SAFETY AND COMPLIANCE
parameter
conditions/description
min
1,500
10
typ
max
units
Vdc
for 1 minute: input to output; input to case;
output to case
isolation voltage
isolation resistance
RoHS
MΩ
2011/65/EU (CE)
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CUI Inc │ SERIES: VFK600 │ DESCRIPTION: DC-DC CONVERTER
date 12/17/2013 │ page 3 of 8
ENVIRONMENTAL
parameter
conditions/description
min
-40
-55
typ
max
85
units
°C
operating temperature
storage temperature
see derating curves
105
°C
MECHANICAL
parameter
dimensions
conditions/description
min
typ
max
units
199.14 x 126.75 x 39.12 (7.84 x 4.99 x 1.54 inch)
steel and aluminum extrusion
mm
case material
weight
1.2
kg
MECHANICAL DRAWING
units: mm[inch]
tolerance: X.XX = ±0.5[±0.02]
X.XXX = ±0.25[±0.010]
wire range: 22~12 AWG
screw size: #6-32
PIN CONNECTIONS
PIN
1, 2
3
FUNCTION
+Vin
REM
case
-Vin
+Vo
+S
4
5, 6
7, 8
9
10
PC
11
Trim
-S
12
199.14 7.840
13, 14
-Vo
4.50 0.177
( 4 PLCS)
39.12 1.540
7
1
2
3
8
126.75 4.990
9
10
11
12
13
14
111.29 4.381
116.68 4.594
4
5
6
130.00 5.118
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CUI Inc │ SERIES: VFK600 │ DESCRIPTION: DC-DC CONVERTER
date 12/17/2013 │ page 4 of 8
DERATING CURVES
VFK600 Power Derating Curves At Nominal Input
(Includes 24 V input, 12/24/28 V output models and VFK600-D48-S12)
120%
100%
80%
60%
40%
20%
Natural
Convection
0.5 m/S
(100LFM)
1.0 m/S
(200LFM)
1.5 m/S
(300LFM)
2.0 m/S
(400LFM)
2.5 m/S
(500LFM)
3.0 m/S
(600LFM)
3.5 m/S
(700LFM)
0%
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature - degrees C
VFK600 Power Derating Curves At Nominal Input
(Includes 24 V input, 32/48 V output models and 48 V input, 24/28/32/48 V output models)
120%
100%
80%
60%
40%
20%
0%
Natural
Convection
0.5 m/S
(100LFM)
1.0 m/S
(200LFM)
1.5 m/S
(300LFM)
2.0 m/S
(400LFM)
2.5 m/S
(500LFM)
3.0 m/S
(600LFM)
3.5 m/S
(700LFM)
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature - degrees C
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CUI Inc │ SERIES: VFK600 │ DESCRIPTION: DC-DC CONVERTER
date 12/17/2013 │ page 5 of 8
TEST CONFIGURATION
Figure 1
Table 1
A
+Vin
+Vout
+S
Recommended External components
C1
C2
220 μF/100 V
470 μF/100 V
A
C2
TRIM
V
C1
DC
Load
-S
-Vout
-Vin
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CUI Inc │ SERIES: VFK600 │ DESCRIPTION: DC-DC CONVERTER
date 12/17/2013 │ page 6 of 8
APPLICATION NOTES
1. Parallel Operation
The VFK600 series are designed for parallel operation. When in parallel the load current can be shared equally between the two
modules by connecting their PC pins. The VFK600 can be setup in two different modes to achieve parallel operation. The stan
dard parallel operation is suitable when load cannot be handled by a single unit, whereas the N+1 redundant operation is suitable
for loads when backup power is required.
STANDARD PARALLEL CONNECTION
PARALLEL CONNECTION WITH PROGRAMMED AND
ADJUSTABLE OUTPUT
+S
+S
+V
+V
-V
-S
TRIM
-V
-S
PC
L
O
A
D
L
O
A
D
PC
+S
+V
+S
+V
-V
-S
TRIM
-V
-S
PC
PC
N+1 REDUNDANT CONNECTION
N+1 REDUNDANT CONNECTION WITH PROGRAMMED
OUTPUT AND ADJUSTABLE OUTPUT VOLTAGE
+S
+S
+V
+V
-V
-S
TRIM
-V
-S
L
L
O
A
D
O
PC
PC
A
D
+S
+V
+S
+V
-V
-S
TRIM
PC
-V
-S
PC
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CUI Inc │ SERIES: VFK600 │ DESCRIPTION: DC-DC CONVERTER
date 12/17/2013 │ page 7 of 8
APPLICATION NOTES (CONTINUED)
2. Output Voltage Trimming
Leave open if not used.
Figure 2
External Resistors
Trim-Up/Trim-Down Formulas
+S
Rt ×33
1.24×(
)
VR
Rt +33
Vf =
Rt ×33
+V
(
)
7.68 +
Rt +33
Load
Vout = (Vo + VR)×Vf
-V
-S
Note: Rt = 6.8 KΩ
VO is the nominal output voltage
VOUT is the desired output voltage (up or down)
VR is the trim resistor in KΩ
Rt
TRIM
Figure 3
External DC Voltage
Trim-Up/Trim-Down Formulas
Vout = V
T
× VO
Note: VT is the trim terminal voltage
VO is the nominal output voltage
VOUT is the desired output voltage (up or down)
Note:
1. All specifications measured at nominal line, full load, and 25°C unless otherwise specified.
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CUI Inc │ SERIES: VFK600 │ DESCRIPTION: DC-DC CONVERTER
date 12/17/2013 │ page 8 of 8
REVISION HISTORY
rev.
description
date
1.0
initial release
derating curves added
11/04/2011
03/12/2012
08/07/2012
03/13/2013
12/17/2013
1.01
1.02
1.03
1.04
V-Infinity branding removed
updated spec
added parallel operation and trimming information
The revision history provided is for informational purposes only and is believed to be accurate.
Headquarters
20050 SW 112th Ave.
Tualatin, OR 97062
800.275.4899
Fax 503.612.2383
cui.com
techsupport@cui.com
CUI offers a two (2) year limited warranty. Complete warranty information is listed on our website.
CUI reserves the right to make changes to the product at any time without notice. Information provided by CUI is believed to be accurate and reliable. However, no responsibility is
assumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use.
CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical component is any component of a
life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
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