dat date e 07/01/2013 07/01/2013 page page 1 of 5 1 of 5 SERIES: VEFT1-S-SMT │ DESCRIPTION: DC-DC CONVERTER FEATURES • 1 W isolated output • industry standard 12 pin SMT package • single unregulated outputs • 3,000 V isolation • short circuit protection • UL safety approvals (some models) • wide temperature (-40~85°C) • efficiency up to 81% RoHS input output output output ripple efficiency MODEL 1 voltage voltage current power and noise typ range min max max max typ (Vdc) (Vdc) (Vdc) (mA) (mA) (W) (mVp-p) (%) VEFT1-S3.3-S3.3-SMT 3.3 3.00~3.60 3.3 30 300 1 100 72 VEFT1-S3.3-S5-SMT 3.3 3.00~3.60 5 20 200 1 100 73 VEFT1-S5-S5-SMT 5 4.5~5.5 5 20 200 1 100 70 VEFT1-S5-S9-SMT 5 4.5~5.5 9 12 111 1 100 75 VEFT1-S5-S12-SMT 5 4.5~5.5 12 9 83 1 100 78 VEFT1-S5-S15-SMT 5 4.5~5.5 15 7 67 1 100 80 VEFT1-S12-S3.3-SMT 12 10.8~13.2 3.3 30 300 1 100 75 VEFT1-S12-S5-SMT 12 10.8~13.2 5 20 200 1 100 70 VEFT1-S12-S9-SMT 12 10.8~13.2 9 12 111 1 100 76 VEFT1-S12-S12-SMT 12 10.8~13.2 12 9 83 1 100 79 VEFT1-S12-S15-SMT 12 10.8~13.2 15 7 67 1 100 81 VEFT1-S24-S3.3-SMT 24 21.6~26.4 3.3 30 300 1 100 73 VEFT1-S24-S5-SMT 24 21.6~26.4 5 20 200 1 100 79 VEFT1-S24-S9-SMT 24 21.6~26.4 9 12 111 1 100 80 VEFT1-S24-S12-SMT 24 21.6~26.4 12 9 83 1 100 81 VEFT1-S24-S15-SMT 24 21.6~26.4 15 7 67 1 100 79 VEFT1-S24-S24-SMT 24 21.6~26.4 24 5 42 1 100 80 Notes: 1. ripple and noise are measured at 20 MHz BW PART NUMBER KEY VEFT1 - SXX - SXX -SMT - X Base Number Output Voltage Package Options "blank" = standard Input Voltage Packaging Style TR = Tape & Reel cui.com CUI Inc │ SERIES: VEFT1-S-SMT │ DESCRIPTION: DC-DC CONVERTER date 07/01/2013 │ page 2 of 5 INPUT parameter conditions/description min typ max units 3.3 V model 3.00 3.3 3.60 Vdc 5 V model 4.5 5 5.5 Vdc operating input voltage 12 V model 10.8 12 13.2 Vdc 24 V model 21.6 24 26.4 Vdc OUTPUT parameter conditions/description min typ max units for Vin change of 1%, 3.3 V model ±1.5 % line regulation for Vin change of 1%, all other models ±1.2 % 3.3 V model 15 20 % 5 V model 12.8 15 % measured from 10% 9 V model 8.3 10 % load regulation load to full load 12 V model 6.8 10 % 15 V model 6.3 10 % 24 V model 6.0 10 % voltage accuracy see derating curves 100% load, 3.3, 5 and 12 V input 100 kHz switching frequency 100% load, 24 V input 500 kHz temperature coefficient ±0.03 %/°C PROTECTIONS parameter conditions/description min typ max units short circuit protection 1 s SAFETY AND COMPLIANCE parameter conditions/description min typ max units isolation voltage for 1 minute at 1 mA max. 3,000 Vdc isolation resistance at 500 Vdc 1,000 MΩ 1 safety approvals UL MTBF 3,500,000 hours RoHS compliant yes Notes: 1. VEFT1-S5-S5/9/12/15 and VEFT1-S12-S5/9/12/15 only ENVIRONMENTAL parameter conditions/description min typ max units operating temperature -40 85 °C storage temperature -55 125 °C storage humidity non-condensing 95 % temperature rise at full load 15 25 °C reflow soldering see reflow soldering profile 260 °C Peak Temperature 250 260°C for 10 Sec. Max 220°C 200 90 Sec. max (>220°C) 150 100 50 0 Time (Seconds) cui.com Temperature (°C) CUI Inc │ SERIES: VEFT1-S-SMT │ DESCRIPTION: DC-DC CONVERTER date 07/01/2013 │ page 3 of 5 DERATING CURVES 1. output power vs. ambient temperature 2. output voltage vs. output current +10% +5% 100 +2.5% Nominal 80 Voltage -2.5% 60 -7.5% 40 20 -40-20 0204060 85 105 120 10% 50% 100% Ambient Temperature (°C) Output Current (%) MECHANICAL parameter conditions/description min typ max units dimensions 15.24 x 11.20 x 6.50 (0.600 x 0.441 x 0.256 inch) mm case material plastic (UL94-V0) weight 1.71 g MECHANICAL DRAWING units: mm [inches] tolerance: ±0.15 [±0.006] pin section tolerance: ±0.10 [±0.004] 1.00 [0.039] (SideView) 6.25 [0.246] 6.50 [0.256] 12 11 10 8 7 2.54 [0.100] 0.60 [0.024] 0.25 [0.010] 10.10[0.398] 2.10 [0.083] 3 5 6 12 15.24[0.600] 12.70[0.500] 2.54 [0.100] 2.54 [0.100] 12 11 10 8 7 7.50 [0.295] (Top View) 11.20[0.441] 12 3 5 6 PIN CONNECTIONS PIN FUNCTION 1 GND 2 +Vin A 5 0 V 8.50 [0.335] 6 NC 8 +Vo A 0.25 [0.010] others NC 5°max 1.35 [0.053] cui.com Load (%) Output Voltate (%) CUI Inc │ SERIES: VEFT1-S-SMT │ DESCRIPTION: DC-DC CONVERTER date 07/01/2013 │ page 4 of 5 APPLICATION NOTES 1. Requirement on Output Load In order to ensure the product operates efficiently and reliably, make sure the specified range of input voltage is not exceeded and the minimum output load is not less than 10% load. If the actual load is less than the specified minimum load, the output ripple may increase sharply while its efficiency and reliability will reduce greatly. If the actual output power is very small, please add an appropriate resistor as extra loading. 2. Overload Protection Under normal operating conditions, the output circuit of these products has no protection against over-current and short-circuits. The simplest method is to connect a self-recovery fuse in series at the input end or add a circuit breaker to the circuit. 3. Filtering In some circuits which are sensitive to noise and ripple, a filtering capacitor may be added to the DC/DC output end and input end to reduce the noise and ripple. However, the capacitance of the output filter capacitor must be proper. If the capacitance is too big, a startup problem might arise. For every channel of output, provided the safe and reliable operation is ensured, the greatest capacitance of its filter capacitor sees the external capacitor table. To get an extremely low ripple, an “LC” filtering network may be connected to the input and output ends of the DC/DC converter, which may produce a more significant filtering effect. It should also be noted that the inductance and the frequency of the “LC” filtering network should be staggered with the DC/DC frequency to avoid mutual interference (Figure 1). L L +Vo Vin Figure 1 Cin Cout DC DC GND 0V 4. Output Voltage Regulation and Over-voltage Protection Circuit The simplest device for output voltage regulation, over-voltage and over-current protection is a linear voltage regulator with overheat protection that is connected to the input or output end in series (Figure 2). REG +Vo Vin REG Figure 2 DC DC GND 0V 5. External Capacitor Table It is not recommended to connect any external capacitor in the application field with less than 0.5 W output. Vin Cin Vout Cout (Vdc) (µF) (Vdc) (µF) 3.3/5 4.7 5 10 Table 1 12 2.2 9 4.7 24 1 12 2.2 -- -- 15 1 -- -- 24 0.47 Note: All specifications measured at 25°C, humidity <75%, nominal input voltage, and full load unless otherwise noted. cui.com CUI Inc │ SERIES: VEFT1-S-SMT │ DESCRIPTION: DC-DC CONVERTER date 07/01/2013 │ page 5 of 5 REVISION HISTORY rev. description date 1.0 initial release 10/01/2009 1.01 new template applied 04/12/2012 1.02 V-Infinity branding removed, VEFT1-S12-S24-SMT discontinued 08/07/2012 1.03 picture updated 09/05/2012 1.04 added TR package option 11/01/2012 1.05 discontinued VEFT1-S5-S3.3-SMT and VEFT1-S5-S24-SMT models 07/01/2013 The revision history provided is for informational purposes only and is believed to be accurate. Headquarters 20050 SW 112th Ave. Fax 503.612.2383 Tualatin, OR 97062 cui.com 800.275.4899 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.