rev. page date description: single output series dc-dc converter 1 of 3 10/2009 20050 sw 112 th ave. tualatin, oregon 97062 p h o n e phone 503.612.2300 f a x www.v-infinity.com fax 503.612.2383 part number: veft1-smt features isolated 1 w output temperature range: -40c~+85c unregulated high efficiency to 80% single voltage output small footprint smd package style industry standard pinout ul94-v0 package no heatsink required 3k vdc isolation power density 0.85 w/cm3 no external component required low cost model input voltage output output current package nominal range voltage max. min. efficiency style ul60950-1 veft1-s3.3-s3.3-smt 3.3 vdc 3.00~3.60 vdc 3.3 vdc 300 ma 30 ma 72% smd no veft1-s3.3-s5-smt 3.3 vdc 3.00~3.60 vdc 5 vdc 200 ma 20 ma 73% smd no veft1-s5-s3.3-smt 5 vdc 4.5~5.5 vdc 3.3 vdc 300 ma 30 ma 74% smd no veft1-s5-s5-smt 5 vdc 4.5~5.5 vdc 5 vdc 200 ma 20 ma 70% smd yes veft1-s5-s9-smt 5 vdc 4.5~5.5 vdc 9 vdc 111 ma 12 ma 75% smd yes veft1-s5-s12-smt 5 vdc 4.5~5.5 vdc 12 vdc 83 ma 9 ma 78% smd yes veft1-s5-s15-smt 5 vdc 4.5~5.5 vdc 15 vdc 67 ma 7 ma 80% smd yes veft1-s5-s24-smt 5 vdc 4.5~5.5 vdc 24 vdc 42 ma 5 ma 78% smd no veft1-s12-s3.3-smt 12 vdc 10.8~13.2 vdc 3.3 vdc 300 ma 30 ma 75% smd no veft1-s12-s5-smt 12 vdc 10.8~13.2 vdc 5 vdc 200 ma 20 ma 72% smd yes veft1-s12-s9-smt 12 vdc 10.8~13.2 vdc 9 vdc 111 ma 12 ma 76% smd yes veft1-s12-s12-smt 12 vdc 10.8~13.2 vdc 12 vdc 83 ma 9 ma 79% smd yes veft1-s12-s15-smt 12 vdc 10.8~13.2 vdc 15 vdc 67 ma 7 ma 81% smd yes veft1-s12-s24-smt 12 vdc 10.8~13.2 vdc 24 vdc 42 ma 5 ma 79% smd no veft1-s24-s3.3-smt 24 vdc 21.6~26.4 vdc 3.3 vdc 300 ma 30 ma 73% smd no veft1-s24-s5-smt 24 vdc 21.6~26.4 vdc 5 vdc 200 ma 20 ma 79% smd no veft1-s24-s9-smt 24 vdc 21.6~26.4 vdc 9 vdc 111 ma 12 ma 80% smd no veft1-s24-s12-smt 24 vdc 21.6~26.4 vdc 12 vdc 83 ma 9 ma 81% smd no veft1-s24-s15-smt 24 vdc 21.6~26.4 vdc 15 vdc 67 ma 7 ma 79% smd no veft1-s24-s24-smt 24vdc 21.6~26.4 vdc 24 vdc 42 ma 5 ma 80% smd no description designed to convert fixed voltages into an isolated voltage, the veft1-smt sin- gle series is well suited for providing board-mount local supplies in a wide range of applications, including mixed analog/digital circuits, test & measure- ment equip., process/machine controls, datacom/telecom fields, etc... the semi-regulated output can be fol- lowed by 3-terminal regulators to pro- vide output protection, in addition to output regulation. output specifications item test conditions min. typ. max. units output power 0.1 1 w line regulation for vin change of 1% 1.2 % load regulation 10% to 100% full load 10 15 % output voltage accuracy see tolerance envelope graph temperature drift @ 100% load 0.03 %/c output ripple 20 mhz bandwidth 75 150 mvp-p switching frequency full load, nominal input 100 125 160 khz
rev. page date description: single output series dc-dc converter 2 of 3 10/2009 20050 sw 112 th ave. tualatin, oregon 97062 p h o n e phone 503.612.2300 f a x www.v-infinity.com fax 503.612.2383 part number: veft1-smt general specifications short circuit protection <1 second temperature rise at full load 25c max, 15c typ. cooling free air convection operating temperature range -40c to +85c storage temperature range -55c to +125c soldering temperature 300c (1.5mm from case for 10 sec.) storage humidity range <95% case material plastic (ul94-v0) safety 2 approved to ul60950-1 (e222736) mtbf >3,500,000 hrs. burn-in full load at +85c, for 4 hours at no-load and 4 hours at full load. isolation specifications item test conditions min. typ. max. units isolation voltage tested for 1 min. 3000 vdc insulation resistance test at 500 vdc 1000 m typical characteristics 12 11 10 8 7 1 2 3 5 6 pin 7 8 10 11 12 nc +vout nc nc nc pin 1 2 3 5 6 -vin +vin nc -vout nc pin pin pin pin a 1.50 1.20 0.50 5.00 6.0 7.5 15.24 1.85max 0.3 a 6.70 7.0 11.2 max 15.24 7.62 note: all pins on a 2.54mm pitch; all pin diameters are 0.50mm; all dimensions in mm. side view top view outline dimensions & recommended layout pattern note: 1. all specifications measured at ta=25c, humidity <75%, nominal input voltage and rated output load unless otherwise specified. 2. see table on page 1 for available models
rev. page date description: single output series dc-dc converter 3 of 3 10/2009 20050 sw 112 th ave. tualatin, oregon 97062 p h o n e phone 503.612.2300 f a x www.v-infinity.com fax 503.612.2383 part number: veft1-smt application notes: - input filtering to reduce the reflected ripple current and minimize emi, especially when the converter input is more than 2 away from the dc source, it is recommended to connect a low esr electrolytic capacitor between vin and gnd. the values suggested are as shown in table 1. if additional filtering is required, the capacitance may be increased, or expanded to an lc network as shown in figure 1. input voltage external input capacitance 4.7 f 5 v 12 v 2.2 f 24 v 1.0 f table 1 - output filtering an output capacitor is needed to meet output ripple requirements as shown in table 2. output capacitance may be increased for additional filtering, but should not exeed 10f or expanded to an lc network as in figure 1. vout external ouput capacitance 10 f 5 v 9 v 4.7 f 12 v 2.2 f 15 v 1 f 24 v 0.47 f table 2 figure 1 dc c l l dc c -vin +vin -vout +vout reg dc dc dc dc reg -vin +vin +vout -vout -vout +vout +vin -vin - minimum loading the converter needs a minimum of 10% loading to maintain output regulation. operation under no-load conditions will not cause immediate damages but may reduce reliability, and cause performance not to meet specifications. - regulation with a semi-regulated design, the converters output voltage varies with load current and will change proportionally to the input voltage. if regulated output is needed, an external regulator can be used as shown in figure 2. - protection the converter has minimal protection against input over-voltage or output over-load, and may be permanently damaged if exposed to these conditions. an input clamping device can be used for input voltage limiting. an input fuse or an output fuse can also be used to protect against over-loading. - external regulator an external 3-terminal regulator can be connected to the output of the converter to achieve full regulation. make sure the converters output voltage provides sufficient head room for the regulator. an additional benefit is that the built-in protection features in the regulator, such as ocp, otp, etc, will protect the converter also. in a complimentory supply, a negative output regulator must be used to achieve the negative regulated output.
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