unisonic technologies co., ltd a2804 linear integrated circuit www.unisonic.com.tw 1 of 4 copyright ? 2015 unisonic technologies co., ltd qw-r121-004.e zero voltage switch ? description the utc a2804 is a triac controller providing a complete solution for temperature controlled electric panel heaters, cookers, film processing baths etc. switching occurs at the zero volt age point in order to minimize radio frequency interference. the device is suitable for mains-on-line operation and requires minimal components. ? features *easy operation either through the ac line or a dc supply. *supply voltage control. *very few external components. *symmetrical burst control-no dc current components in the load circuit *negative output current pulse up to 250ma-short circuit protection. *reference voltage output dip-8 sop-8 ordering information ordering number lead free halogen free package packing a2804l-d08-t a2804g-d08-t dip-8 tube - a2804g-s08-r sop-8 tape reel ? marking dip-8 sop-8
a2804 linear integrated circuit unisonic technologies co., ltd 2 of 4 www.unisonic.com.tw qw-r121-004.e ? pin configuration ? block diagram voltage limit voltage control g1 g4 g3 half wave detector memory q q g5 4 3 2 1 pulse amplifier 6 8 7 gnd 5 is vs i syn v syn r syn ac input lo v out pulse generator synchronous stage s reference voltage ref. voltage output com output inv. input non-inv. input + - compa rator g2
a2804 linear integrated circuit unisonic technologies co., ltd 3 of 4 www.unisonic.com.tw qw-r121-004.e ? absolute maximum ratings (t a =25 , unless otherwise specified.) parameter symbol ratings unit supply voltage -vs 8.2 v input voltage v in iv si v supply current -is 40 (average) ma synchronous current i syn 5.0 (rms) ma power dissipation p d 350 mw junction temperature t j 125 ? c operating ambient temperature t opr -20 ~ +70 ? c storage temperature t stg -65 ~ +150 ? c note : absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device operation is not implied. ? electrical characteristics (v s =8.0v, v syn =100 ~ 115v rms , t a =25 , f=50/60hz) parameter symbol pin no. test conditions min typ max unit output voltage v out 6 i out 150ma 4.2 5.2 7.0 v input offset voltage v i(off) 3, 4 2.0 5.0 mv supply voltage 1 -v s1 5 i s =2.5ma, r syn =56k 7.2 8.4 v supply voltage 2 -v s2 5 i s =20ma, r syn =56k 8 8.9 v common mode input voltage -v i(cm) 3, 4 0 5.7 v reference voltage -v r 1 i r 1 a 3.6 v circuit current -i s 5 r syn =56k 1.0 2.0 3.0 ma synchronous current i syn 8 0.3 ma output current i out 6 r out 25 150 180 ma output leakage current i lo 6 2.0 a input bias current i i(bias) 3, 4 0.5 1.0 a output leakage current i lc 2 0.2 a output pulse width t pulse 6 r syn =56k 150 200 250 s
a2804 linear integrated circuit unisonic technologies co., ltd 4 of 4 www.unisonic.com.tw qw-r121-004.e ? typical applications on-off temperature control 1 2 3 4 5 6 7 8 ro 56 ac 100v/rms 50/60hz rsyn 56k rs 6.8k 2w rh: hysteresis voltage set vr ntc rh 100 f utc a2804 time proportional temperature control load utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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