Datasheet

ManualsBrandsCUI INC ManualsPSU ComponentsDC/DC converter (module) 12 V 33.6 A 400 W No. of outputs: 1 x

cui.com

date 01/03/2014

page 1 of 6

SERIES: VFK400W │ DESCRIPTION: DC-DC CONVERTER

date 01/03/2014

page 1 of 6

FEATURES

• up to 400 W isolated output

• rugged metal enclosure with integrated heat sink

• 4:1 input range (10~36 Vdc, 18~75 Vdc)

• single output from 12~48 Vdc

• 1,500 Vdc isolation

• over current, over temperature, over voltage,

and short circuit protection

• remote on/off

• efficiency up to 87%

PART NUMBER KEY

VFK400W - QXX - SXX

Input Voltage Output Voltage

Base Number

MODEL

input

voltage

output

voltage

output

current

output

power

ripple

and noise

efﬁ ciency

range

(Vdc) (Vdc)

max

(A)

max

(W)

max

(mVp-p)

max

(%)

VFK400W-Q24-S12 10~36 12 33.3 400 200 87

VFK400W-Q24-S24 10~36 24 16.7 400 240 86

VFK400W-Q24-S48 10~36 48 8.3 398 480 86

VFK400W-Q48-S12

20~75 12 33.3 400 200 87

VFK400W-Q48-S24 18~75 24 16.7 400 240 86

VFK400W-Q48-S48 18~75 48 8.3 398 480 86.5

Note: 1. Ripple and noise are measured at full load, 20 MHz BW with 10F tantalum capacitor and 1F ceramic capacitor across the output. The 48 Vdc output models require a

22uF aluminum capacitor and a 1uF ceramic capacitor across the output.

2. An external input capacitor of 470uF is recommended to reduce input ripple voltage.

For more information, please visit the product page.

Summary of content (6 pages)

PAGE 1
For more information, please visit the product page.
PAGE 2
For more information, please visit the product page. CUI Inc │ SERIES: VFK400W │ DESCRIPTION: DC-DC CONVERTER date 01/03/2014 │ page 2 of 6 INPUT parameter conditions/description 24 Vdc input operating input voltage max units 24 36 Vdc 20 18 48 48 75 75 Vdc Vdc 12 Vdc output model 24/48 Vdc output models 24 Vdc input power up power down 9.5 8.5 Vdc Vdc 48 Vdc input power up power down 17.8 15.
PAGE 3
For more information, please visit the product page. CUI Inc │ SERIES: VFK400W │ DESCRIPTION: DC-DC CONVERTER date 01/03/2014 │ page 3 of 6 MECHANICAL parameter conditions/description dimensions 198.90 x 127.00 x 38.93 (7.831 x 5.000 x 1.533 inch) min case material steel and aluminum extrusion weight typ max units mm 1.18 kg MECHANICAL DRAWING units: mm[inch] tolerance: X.X = ±0.5[±0.02] X.XX = ±0.25[±0.
PAGE 4
For more information, please visit the product page. CUI Inc │ SERIES: VFK400W │ DESCRIPTION: DC-DC CONVERTER date 01/03/2014 │ page 4 of 6 DERATING CURVES VFK400W Power Derating Curves At Nominal Input (Includes VFK400W-Q24-S12 and all 48 Vdc input models) 120% Natural Convection Relative Output Power - % off nominal output 100% 0.5 m/S (100LFM) 1.0 m/S (200LFM) 80% 1.5 m/S (300LFM) 60% 2.0 m/S (400LFM) 2.5 m/S (500LFM) 40% 3.0 m/S (600LFM) 20% 3.
PAGE 5
For more information, please visit the product page. CUI Inc │ SERIES: VFK400W │ DESCRIPTION: DC-DC CONVERTER date 01/03/2014 │ page 5 of 6 APPLICATION NOTES 1. Output Voltage Trimming Leave open if not used. Figure 1 Application Circuit for Trim pin +Vin +Vo +Sense R trim-up Trim up R-Load Trim -Vin -Sense -Vo +Vin +Vo +Sense Trim Trim down R-Load R trim-down -Vin Table 1 Table 2 Trim Up Resistor Values (MΩ)1 Trim Down Resistor Values (KΩ) Desired Vout (%Vout) Nom.
PAGE 6
For more information, please visit the product page. CUI Inc │ SERIES: VFK400W │ DESCRIPTION: DC-DC CONVERTER date 01/03/2014 │ page 6 of 6 REVISION HISTORY rev. description date 1.0 initial release 03/13/2012 1.01 updated adjustability range 09/20/2012 1.02 corrected weight 12/18/2012 1.03 updated spec 04/01/2013 added trimming information 01/03/2014 1.04 The revision history provided is for informational purposes only and is believed to be accurate. Headquarters 20050 SW 112th Ave.