For more information, please visit the product page. date 03/12/2012 page 1 of 5 SERIES: VFK400W DESCRIPTION: DC-DC CONVERTER FEATURES * * * * * * up to 400 W isolated output rugged metal enclosure with integrated heat sink 4:1 input range (10~36 V, 18~75 V) single output from 12~48 V 1,500 V isolation over current, over temperature, over voltage, and short circuit protection * remote on/off * efficiency up to 87% RoHS input voltage output voltage output current output power ripple and noise1 efficiency 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 8.3 400 480 86 VFK400W-Q48-S12 20~75 12 33.6 400 200 87 VFK400W-Q48-S24 18~75 24 16.7 400 240 86 VFK400W-Q48-S48 18~75 48 8.3 400 480 86.5 MODEL Notes: 1. ripple and noise are measured at 20 MHz BW with 10F tantalum capacitor and 1F ceramic capacitor across output PART NUMBER KEY VFK400W-Q XX -S XX Base Number Input Voltage cui.com Output Voltage For more information, please visit the product page. CUI Inc SERIES: VFK400W DESCRIPTION: DC-DC CONVERTER date 03/12/2012 page 2 of 5 INPUT parameter operating input voltage under voltage lockout conditions/description 24 V input 48 V input power up power down 12 V output 24, 48 V output 24 48 24 48 V V V V min typ max units 10 20 18 24 48 48 36 75 75 Vdc Vdc input input input input 9.5 17.8 18.5 15.5 Vdc Vdc Vdc Vdc remote on/off1 Notes: 1. logic compatibility, open collector ref to -input Module ON, 3.5~75 Vdc or open circuit Module OFF, <1.2 Vdc OUTPUT parameter conditions/description line regulation load regulation min typ max units measured from high line to low line 1 % measured from full load to zero load 1 % voltage accuracy transient response 25% step load change adjustability2 60 switching frequency temperature coefficient Notes: 1.5 % 500 s 110 % 250 kHz 0.03 %/C 2. trim-up: connect a resistor between the trim pin and +Sense trim-down: connect a resistor between the trim pin and -Sense PROTECTIONS parameter conditions/description min over voltage protection %Vo over current protection % nominal output current short circuit protection continuous typ max units 115 140 % 110 150 % max units SAFETY AND COMPLIANCE parameter conditions/description isolation voltage input to output input to case output to case min isolation resistance RoHS compliant typ 1,500 1,500 1,500 Vdc Vdc Vdc 10 M yes ENVIRONMENTAL parameter conditions/description min case operating temperature see derating curve -40 maximum case temperature typ max units 100 C 110 storage temperature -55 cui.com C 105 C For more information, please visit the product page. CUI Inc SERIES: VFK400W DESCRIPTION: DC-DC CONVERTER date 03/12/2012 page 3 of 5 DERATING CURVES 24 V input, 12 V output 48 V input, 12/24/48 V output 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% 3.5 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 24 V input, 24/48 V output 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% 3.5 m/S (700LFM) 0% 0 5 10 15 20 25 30 35 40 45 50 55 Ambient Temperature - degrees C cui.com 60 65 70 75 80 85 For more information, please visit the product page. CUI Inc SERIES: VFK400W DESCRIPTION: DC-DC CONVERTER date 03/12/2012 page 4 of 5 MECHANICAL parameter conditions/description dimensions 7.84 x 4.99 x 1.54 (199 x 126.8 x 39 mm) min case material steel and aluminum extrusion weight typ max units inch 14.2 g MECHANICAL DRAWING units: mm[inch] TOLERANCE: X.X = 0.3mm X.XX = 0.25mm PIN CONNECTIONS PIN FUNCTION 1,2 +Vin 3,4 -Vin 5 on/off 6 case 7,8 +Vo 9 +S 10 Trim 11 -S 12,13 -Vo 198.90 7.831 4.50 0.177 (4 PLCS) 38.93 1.533 7 1 8 2 127.00 5.000 116.92 4.603 9 3 10 4 11 5 12 6 13 130.00 5.118 cui.com 111.29 4.382 For more information, please visit the product page. CUI Inc SERIES: VFK400W DESCRIPTION: DC-DC CONVERTER date 03/12/2012 page 5 of 5 REVISION HISTORY rev. 1.0 description date initial release 03/12/2012 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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