For more information, please visit the product page. date 07/01/2013 page 1 of 5 SERIES: VEFT1-S-SMT │ DESCRIPTION: DC-DC CONVERTER 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% U • • • • • • • • ED FEATURES MODEL input voltage output voltage N RoHS output current efficiency max (W) max (mVp-p) typ (%) (Vdc) 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 12 9 83 1 100 79 N 12 10.8~13.2 12 10.8~13.2 15 7 67 1 100 81 24 21.6~26.4 3.3 30 300 1 100 73 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 IS C VEFT1-S24-S5-SMT O VEFT1-S24-S3.3-SMT TI range (Vdc) VEFT1-S12-S15-SMT max (mA) ripple and noise1 typ (Vdc) VEFT1-S12-S12-SMT min (mA) output power Notes: 1. ripple and noise are measured at 20 MHz BW D PART NUMBER KEY VEFT1 - SXX - SXX -SMT - X Output Voltage Base Number Input Voltage Packaging Style cui.com Package Options "blank" = standard TR = Tape & Reel For more information, please visit the product page. CUI Inc │ SERIES: VEFT1-S-SMT │ DESCRIPTION: DC-DC CONVERTER date 07/01/2013 │ page 2 of 5 INPUT conditions/description min typ max units operating input voltage 3.3 V model 5 V model 12 V model 24 V model 3.00 4.5 10.8 21.6 3.3 5 12 24 3.60 5.5 13.2 26.4 Vdc Vdc Vdc Vdc parameter conditions/description min typ line regulation for Vin change of 1%, 3.3 V model for Vin change of 1%, all other models OUTPUT measured from 10% load to full load voltage accuracy see derating curves switching frequency 100% load, 3.3, 5 and 12 V input 100% load, 24 V input temperature coefficient parameter TI PROTECTIONS U load regulation 15 12.8 8.3 6.8 6.3 6.0 N 3.3 V model 5 V model 9 V model 12 V model 15 V model 24 V model ED parameter conditions/description short circuit protection SAFETY AND COMPLIANCE min units % % 20 15 10 10 10 10 % % % % % % 100 500 kHz kHz ±0.03 %/°C typ units 1 s max units isolation voltage for 1 minute at 1 mA max. 3,000 Vdc isolation resistance at 500 Vdc 1,000 MΩ safety approvals UL 3,500,000 hours Notes: O RoHS compliant N conditions/description MTBF typ max parameter 1 min max ±1.5 ±1.2 yes 1. VEFT1-S5-S5/9/12/15 and VEFT1-S12-S5/9/12/15 only IS C ENVIRONMENTAL parameter conditions/description min operating temperature storage temperature non-condensing temperature rise at full load reflow soldering see reflow soldering profile typ units 85 °C -55 125 °C 95 % 25 °C 260 °C 15 Peak Temperature 260°C for 10 Sec. Max 250 200 Temperature (°C) D storage humidity max -40 90 Sec. max (>220°C) 150 100 50 0 Time (Seconds) cui.com 220°C For more information, please visit the product page. CUI Inc │ SERIES: VEFT1-S-SMT │ DESCRIPTION: DC-DC CONVERTER date 07/01/2013 │ page 3 of 5 DERATING CURVES 2. output voltage vs. output current ED 1. output power vs. ambient temperature +10% Output Voltate (%) Load (%) 100 80 60 40 20 -20 0 20 40 60 85 105 120 -7.5% N parameter conditions/description dimensions 15.24 x 11.20 x 6.50 (0.600 x 0.441 x 0.256 inch) case material plastic (UL94-V0) min typ MECHANICAL DRAWING (Side View) O IS C 12 11 10 8 3 5 7 2.54 [0.100] 3 5 6 2.10 [0.083] 1 2 2.54 [0.100] 11.20 [0.441] 6 PIN CONNECTIONS PIN A 8.50 [0.335] A 0.25 [0.010] 1.35 [0.053] 8 7 (Top View) 1 2 12 11 10 10.10 [0.398] 15.24 [0.600] 12.70 [0.500] 2.54 [0.100] 5°max cui.com FUNCTION 1 GND 2 +Vin 5 0V 6 NC 8 +Vo others NC units g 1.00 [0.039] 6.25 [0.246] 0.60 [0.024] max 1.71 N units: mm [inches] tolerance: ±0.15 [±0.006] pin section tolerance: ±0.10 [±0.004] 0.25 [0.010] 100% mm TI weight 7.50 [0.295] 50% Output Current (%) MECHANICAL D -2.5% 10% Ambient Temperature (°C) 6.50 [0.256] +2.5% Voltage U -40 +5% Nominal For more information, please visit the product page. CUI Inc │ SERIES: VEFT1-S-SMT │ DESCRIPTION: DC-DC CONVERTER date 07/01/2013 │ page 4 of 5 APPLICATION NOTES ED 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. DC DC Cin +Vo Cout 0V TI GND L N Figure 1 L Vin U 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). 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). R EG N Vi n GND O Figure 2 REG +Vo DC DC 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. Cin (µF) Vout (Vdc) Cout (µF) 3.3/5 4.7 5 10 12 2.2 9 4.7 24 1 12 2.2 -- -- 15 1 -- -- 24 0.47 D IS C Table 1 Vin (Vdc) Note: All specifications measured at 25°C, humidity <75%, nominal input voltage, and full load unless otherwise noted. cui.com For more information, please visit the product page. CUI Inc │ SERIES: VEFT1-S-SMT │ DESCRIPTION: DC-DC CONVERTER date 07/01/2013 │ page 5 of 5 REVISION HISTORY rev. description date 10/01/2009 initial release new template applied 1.02 V-Infinity branding removed, VEFT1-S12-S24-SMT discontinued 08/07/2012 1.03 picture updated 09/05/2012 ED 1.0 1.01 04/12/2012 1.04 added TR package option 1.05 discontinued VEFT1-S5-S3.3-SMT and VEFT1-S5-S24-SMT models 11/01/2012 07/01/2013 D IS C O N TI N U 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.