For more information, please visit the product page. date 07/01/2013 page 1 of 5 SERIES: VEFT1-D-SMT │ DESCRIPTION: DC-DC CONVERTER 1 W isolated output industry standard 12 pin SMT package dual unregulated outputs 3,000 V isolation short circuit protection UL safety approvals (some models) wide temperature (-40~85°C) efficiency up to 80% U • • • • • • • • ED FEATURES MODEL input voltage typ (Vdc) output voltage range (Vdc) (Vdc) N RoHS output current output power ripple and noise1 efficiency min (mA) max (mA) max (W) max (mVp-p) typ (%) 5 4.5~5.5 ±12 ±5 ±42 1 75 78 VEFT1-S12-D9-SMT 12 10.8~13.2 ±9 ±6 ±56 1 75 76 VEFT1-S12-D12-SMT 12 10.8~13.2 ±12 ±5 ±42 1 75 78 VEFT1-S12-D15-SMT 12 10.8~13.2 ±15 ±4 ±33 1 75 79 VEFT1-S24-D5-SMT 24 21.6~26.4 ±5 ±10 ±100 1 75 79 VEFT1-S24-D9-SMT 24 21.6~26.4 ±9 ±6 ±56 1 75 80 VEFT1-S24-D12-SMT 24 21.6~26.4 ±12 ±5 ±42 1 75 80 VEFT1-S24-D15-SMT 24 21.6~26.4 ±15 ±4 ±33 1 75 80 N 1. ripple and noise are measured at 20 MHz BW O Notes: TI VEFT1-S5-D12-SMT IS C PART NUMBER KEY VEFT1 - SXX - DXX -SMT - X Base Number Output Voltage Packaging Style D Input Voltage cui.com Package Options "blank" = standard TR = Tape & Reel For more information, please visit the product page. CUI Inc │ SERIES: VEFT1-D-SMT │ DESCRIPTION: DC-DC CONVERTER date 07/01/2013 │ page 2 of 5 INPUT conditions/description min typ max units operating input voltage 5 V model 12 V model 24 V model 4.5 10.8 21.6 5 12 24 5.5 13.2 26.4 Vdc Vdc Vdc parameter conditions/description min typ max units line regulation for Vin change of 1% ±1.2 % 15 10 10 10 % % % % OUTPUT load regulation measured from 10% load to full load voltage accuracy see derating curves switching frequency 100% load, 5 and 12 V input 100% load, 24 V input parameter conditions/description SAFETY AND COMPLIANCE kHz kHz ±0.03 %/°C min TI short circuit protection 100 500 N temperature coefficient PROTECTIONS 12.8 8.3 6.8 6.3 U 5 V model 9 V model 12 V model 15 V model ED parameter units 1 s max units conditions/description for 1 minute at 1 mA max. 3,000 Vdc isolation resistance at 500 Vdc 1,000 MΩ safety approvals1 UL 3,500,000 hours Notes: yes N parameter MTBF typ max isolation voltage RoHS compliant min typ 1. VEFT1-S5-D12 and VEFT1-S12-D9/12/15 only parameter operating temperature conditions/description IS C storage temperature O ENVIRONMENTAL non-condensing at full load reflow soldering see reflow soldering profile 200 max units -40 85 °C -55 125 °C Peak Temperature 260°C for 10 Sec. Max 90 Sec. max (>220°C) 150 100 50 0 typ 15 250 Temperature (°C) D storage humidity temperature rise min Time (Seconds) cui.com 220°C 95 % 25 °C 260 °C For more information, please visit the product page. CUI Inc │ SERIES: VEFT1-D-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 TI weight MECHANICAL DRAWING O N units: mm [inches] tolerance: ±0.25 [±0.010] pin section tolerance: ±0.10 mm [±0.004] 6.25 [0.246] D 8 7 3 5 6 2.54 [0.100] 3 5 6 2.10 [0.083] Top View PCB Layout PIN CONNECTIONS A 0.25 [0.010] A 1.35 [0.053] g 2.54 [0.100] Top View 8.50 [0.335] 1.71 7 2 5°max cui.com units mm 8 1 11.20 [0.441] 1 2 max 12 11 10 15.24 [0.600] 12.70 [0.500] 2.54 [0.100] 12 11 10 typ 1.00 [0.039] 0.60 [0.024] 7.50 [0.295] 100% 10.10 [0.398] IS C Front View 50% Output Current (%) MECHANICAL 0.25 [0.010] -2.5% 10% Ambient Temperature (°C) 6.50 [0.256] +2.5% Voltage U -40 +5% Nominal PIN FUNCTION 1 GND 2 +Vin 5 0V 6 -Vo 8 +Vo others NC For more information, please visit the product page. CUI Inc │ SERIES: VEFT1-D-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. L DC DC Cin Cout 0V L Cout -Vo TI GND +Vo 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 +Vout REG -Vout DC DC 0V IS C 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) 5 4.7 ±5 4.7 12 2.2 ±9 2.2 24 1 ±12 1 -- -- ±15 1 D 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-D-SMT │ DESCRIPTION: DC-DC CONVERTER date 07/01/2013 │ page 5 of 5 REVISION HISTORY rev. description date 04/09/2009 initial release new template applied 1.02 V-Infinity branding removed 1.03 added TR package option 1.04 discontinued VEFT1-S5-D5-SMT, VEFT1-S5-D9-SMT, VEFT1-S5-D15SMT, and VEFT1-S12-D5-SMT models ED 1.0 1.01 04/12/2012 09/05/2012 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.