rev. page date rev. page date description: dc-dc converter 1 of 3 02/2008 20050 sw 112 th ave. tualatin, oregon 97062 p h o n e phone 503.612.2300 f a x fax 503.612.2382 part number: vat2-smt series features isolated 2 w output temperature range: -40c~+85c unregulated high efficiency to 85% dual voltage output small footprint smd package style industry standard pinout ul94-v0 package no heatsink required 1k vdc isolation high power density no external component required low cost description designed to convert fixed volt- ages into an isolated voltage, the vat2-smt series is well suited for providing board-mount local sup- plies in a wide range of applica- tions, including mixed analog/digi- tal circuits, test & measurement equip., process/machine controls, datacom/telecom fields, etc... the semi-regulated output can be followed by 3-terminal regulators to provide output protection, in addition to output regulation. output specifications item test conditions min. typ. max. units output power 0.2 2 w line regulation for vin change of 1% 1.2 % load regulation 10% to 100% full load (5 output) 12.8 15 % 10% to 100% full load (9 output) 8.3 15 % 10% to 100% full load (12 output) 6.8 15 % 10% to 100% full load (15 output) 6.3 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 70 khz note: 1. all specifications measured at ta=25c, humidity <75%, nominal input voltage and rated output load unless otherwise specified. model input voltage output output current number nominal range voltage max. min. efficiency vat2-s5-d5-smt 5 vdc 4.5~5.5 vdc 5 vdc 200 ma 20 ma 82% vat2-s5-d9-smt 5 vdc 4.5~5.5 vdc 9 vdc 111 ma 11 ma 83% vat2-s5-d12-smt 5 vdc 4.5~5.5 vdc 12 vdc 83 ma 8 ma 84% vat2-s5-d15-smt 5 vdc 4.5~5.5 vdc 15 vdc 67 ma 7 ma 82% vat2-s12-d5-smt 12 vdc 10.8~13.2 vdc 5 vdc 200 ma 20 ma 83% vat2-s12-d9-smt 12 vdc 10.8~13.2 vdc 9 vdc 111 ma 11 ma 84% vat2-s12-d12-smt 12 vdc 10.8~13.2 vdc 12 vdc 83 ma 8 ma 84% vat2-s12-d15-smt 12 vdc 10.8~13.2 vdc 15 vdc 67 ma 7 ma 85%
rev. page date description: dc-dc converter 2 of 3 02/2008 20050 sw 112 th ave. tualatin, oregon 97062 p h o n e phone 503.612.2300 f a x fax 503.612.2382 part number: vat2-smt series 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 260c (1.5mm from case for 10 sec.) storage humidity range <95% case material plastic (ul94-v0) mtbf >3,500,000 hrs. isolation specifications item test conditions min. typ. max. units isolation voltage tested for 1 min. 1000 vdc insulation resistance test at 500 vdc 1000 m dimensions (mm) typical characteristics
rev. page date description: dc-dc converter 3 of 3 02/2008 20050 sw 112 th ave. tualatin, oregon 97062 p h o n e phone 503.612.2300 f a x fax 503.612.2382 part number: vat2-smt series 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. table 1 - 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 converter?s 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 also be used to protect against over-loading. - dual outputs used as a single output the +vout and -vout can be used to obtain a single output that is the sum of the two outputs. in this case, the com pin shouldn?t be used. - external regulator an external 3-terminal regulator can be connected to the output of the converter to achieve full regulation. make sure the converter?s 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. - output filtering output capacitance may be increased for additional filtering, but should not exeed 10 f or expanded to an lc network as in figure 1. figure 1 figure 2 recommended reflow soldering profile
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