For more information, please visit the product page. date 01/03/2014 page 1 of 6 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 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% 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 8.3 398 480 86 VFK400W-Q48-S122 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 MODEL Note: 1. Ripple and noise are measured at full load, 20 MHz BW with 10μF tantalum capacitor and 1μF 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. PART NUMBER KEY VFK400W - QXX - SXX 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 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 15.5 Vdc Vdc positive logic filter Note: typ 10 48 Vdc input under voltage shutdown CTRL1 min models ON (>3.5 Vdc or open circuit) models OFF (0~1.2 Vdc) pi filter 1. Open collector refer to -Vin OUTPUT parameter conditions/description min maximum output capacitance for all models line regulation measured from high line to low line load regulation measured from full load to zero load typ voltage accuracy adjustability 90 switching frequency transient response max units 2,200 μF ±1 % ±1 % ±1.5 % 105 250 25% step load change 500 temperature coefficient % kHz ±0.03 μs %/°C PROTECTIONS parameter conditions/description short circuit protection continuous over current protection % nominal output current min over voltage protection over temperature protection typ max units 110 150 % 115 140 % shutdown 110 °C SAFETY AND COMPLIANCE parameter conditions/description min isolation voltage for 1 minute: input to output; input to case; output to case isolation resistance RoHS typ max units 1,500 Vdc 10 MΩ 2011/65/EU (CE) ENVIRONMENTAL parameter conditions/description operating temperature see derating curves min storage temperature cui.com typ max units -40 85 °C -55 105 °C 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[±0.010] wire range: 22~12 AWG screw size: #6-32 PIN CONNECTIONS PIN FUNCTION 1, 2 +Vin 3, 4 -Vin 5 on/off 6 case 7, 8 +Vout 9 +S 10 trim 11 -S 12, 13 -Vout 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 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% 3.5 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 VFK400W Power Derating Curves At Nominal Input (Includes VFK400W-Q24-S24 and VFK400W-Q24-S48) 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 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. Vout (Vdc) 12 -Sense -Vo 101% 102% 103% 104% 105% 2.2 1.6 1.2 0.82 0.68 Desired Vout (%Vout) Nom. Vout (Vdc) 12 90% 92% 94% 96% 98% 9 12 22 51 100 24 4.3 3.3 2.2 1.6 1.5 24 12 22 51 100 300 48 10 6.8 4.8 3.9 3.5 48 22 32 49 100 300 Note: 1. VFK400W-Q48-S12 model requires minimum input voltage of 21.6 Vdc in order to trim between 100~105%. Note: All specifications measured at 25°C, nominal input voltage, and full load unless otherwise noted. cui.com 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. Tualatin, OR 97062 800.275.4899 Fax 503.612.2383 cui.com [email protected] 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.