isolated dc-dc converter VLA312-2425 1 05/09 powerex, inc., 173 pavilion lane, youngwood, pennsylvania 15697 (724) 925-7272 description: VLA312-2425 is an isolated dc-dc converter designed for industrial equipment. it is designed to convert a rectified line voltage ranging from 475 to 850v dc into 24v dc. total output power is 25w. features: input voltage range: 475v to 850v dc output: +24v, 1.05a (output power: 25.2w) electrical isolation voltage between input and output: 2500 v rms for 1 minute over-current protection (auto resumption) over-voltage protection application: on-board pre-regulator for industrial control equipment. outline drawing and circuit diagram dimensions inches millimeters a 3.54 90.0 b 2.16 55.0 c 1.38 35.0 d 0.20 5.0 a b cn1 cn2 parts no. b2p3-vh, jst b2p-vh, jst polarity (pin 1) -v in +v o polarity (pin 2) ? -v o polarity (pin 3) +v in ? connector test circuit diagram block diagram cn1 cn2 c d current sensing control power main control rectifier gate power high side drive a load VLA312-2425 v v in v o +v o + ?v o +v in ?v in fg i o + + ? ? low side drive
2 05/09 VLA312-2425 isolated dc-dc converter powerex, inc., 173 pavilion lane, youngwood, pennsylvania 15697 (724) 925-7272 absolute maximum ratings, t a = 25c unless otherwise specifed characteristics symbol VLA312-2425 units input voltage v in 850 volts output current i o 1.05 a operating temperature (no condensation) *1 t opr -10 ~ +55 c storage temperature (no condensation) t stg -20 ~ +75 c input-output isolation voltage (sine wave voltage, 60hz, 1 minute) v iso 2500 v rms electrical and mechanical characteristics, t a = 25c, v in = 680v unless otherwise noted characteristics symbol test conditions min. typ. max. units input voltage v in recommended range 475 680 850 volts output voltage 1 v o i o = 0.1 ~ 1.05a 22.8 24.0 25.2 volts input regulation r eg-i i o = 1.05a, v in = 475 ~ 850v 100 mv load regulation r eg-l i o = 0.1 ~ 1.05a 150 mv ripple voltage v p-p i o = 1.05a *2 240 mv efficiency h i o = 1.05a 77 % *1 please refer to de-rating characteristics. *2 not including spike noise. output current, i o , (ma) efficiency, , (%) efficiency vs. output current characteristics 100 0 0.2 0.4 0.6 1.2 1.0 0.8 80 90 60 70 40 50 10 20 30 0 0.10 0.08 0.09 0.06 0.07 0.04 0.05 0.01 0.02 0.03 0 output current, i o , (ma) output voltage, v o , (volts) output voltage vs. output current characteristics 30 0 2.0 1.0 1.5 0.5 2.5 9 12 15 18 21 24 27 6 3 0 input voltage, v in , (volts) efficiency, , (%) efficiency vs. input voltage characteristics 400 500 600 800 700 900 i o = 1.05a 0 100 200 300 400 500 600 800 700 900 0 100 200 300 400 500 600 800 700 900 r l = 22.9? (i o = 1.05a) r l = 22.9? (i o = 1.05a) input voltage, v in , (volts) output voltage, v o , (volts) output voltage vs. input voltage characteristics input voltage, v in , (volts) input current, i in , (a) input current vs. input voltage characteristics ambient temperature, (c) output current de-rating, (%) de-rating characteristics 120 -10 10 0 80 20 30 40 50 60 70 100 80 60 40 20 0 v in = 680v v in = 600v v in = 680v v in = 600v 100 80 90 60 70 40 50 10 20 30 0 30 9 12 15 18 21 24 27 6 3 0
VLA312-2425 isolated dc-dc converter 3 05/09 powerex, inc., 173 pavilion lane, youngwood, pennsylvania 15697 (724) 925-7272 safety precautions great detail and careful attention are given to the production of hvics, such as in the development, the quality of production, and in its reliability. however, the reliability of hvics depends not only on their own factors but also in how they are used. when handling hvics please note the following cautions. cautions packaging: the materials used in packaging hvics can only withstand normal external conditions. when exposed to outside shocks, rain, and certain environmental contamination, the packaging materials will deteriorate. please take care in handling. carrying: 1. don't stack boxes too high. avoid placing heavy materials on boxes. 2. boxes must be positioned correctly during transportation to avoid breakage. 3. don't throw or drop boxes. 4. keep boxes dry. avoid rain or snow. 5. minimal vibration and shock during transportation is desirable. storage: when storing hvics, please observe the following notices or possible deterioration of their electrical characteristics, risk of solderability, and external damage may occur. 1. devices must be stored where fluctuation of temperature and humidity is minimal and must not be exposed to direct sunlight. store at the normal temperature of 5 to 30c with humidity at 40 to 60%. 2. avoid locations where corrosive gasses are generated or where a lot of dust accumulates. 3. storage cases must be static proof. 4. avoid putting weight on boxes. extended when extended storage is necessary, hvics must be kept non-processed. when using hvics which have been stored for storage: more than one year or under severe conditions, be sure to check that the exterior is free from flaws or other damage. maximum to prevent any electrical damage, use hvics within the maximum ratings. the temperature, current, voltage, etc., must ratings: not exceed these conditions. polarity: to prevent hvics from destruction and deterioration due to wrong insertion, make sure polarity of inserting leads into the board hole conforms to the external view for the terminal arrangement.
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