unisonic technologies co., ltd cw574 linear integrated circuit www.unisonic.com.tw 1 of 3 copyright ? 2011 unisonic technologies co., ltd qw-r111-008.d 33v color tv voltage regulator ? description the utc cw574 is a parallel voltage regulator which provides stable harmonious voltage for high frequency tuner head of color tv. ? features * low temperature coefficient * low dynamic resister * typical voltage: 33v ? ordering information ordering number package packing lead free halogen free cw574l-t90-b CW574G-T90-B to-92-2 tape box cw574l-t90-k cw574g-t90-k to-92-2 bulk cw574l-t90-r cw574g-t90-r to-92-2 tape reel ? block diagram 1 2
cw574 linear integrated circuit unisonic technologies co., ltd 2 of 3 www.unisonic.com.tw qw-r111-008.d ? absolute maximum ratings (t a =25 c) parameter symbol ratings unit stable current i z 10 ma power dissipation p d 200 mw operating temperature t opr -20 ~ +75 c storage temperature t stg -40 ~ +125 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 (t a =25 c) parameter symbol test conditions min typ max unit stable voltage v z i z =5ma 31 33 35 v dynamic resister r z i z =5ma,i ac =0.5ma,f=1khz 10 25 ? stable current and temperature characteristics v z i z =5ma, t a = -20~75 c -1.0 1.0 mv/ c
cw574 linear integrated circuit unisonic technologies co., ltd 3 of 3 www.unisonic.com.tw qw-r111-008.d ? application circuit 115v rs vi 2 1 33v a r2 r3 r10 r11 r12 tuner control agc bu bv bl aft vt +b ie the utc cw574 is a parallel voltage regulator which provides stable harmonious voltage for high frequency tuner head of color tv. the main power 115v goes through rs resister to position 2 of utc cw574 then the position a with 33v provides stable voltage for control circui t of high frequency tuner. the circuit from r3 to r10 is potential meter for tuning, according to different channels to change contact positions; to provide corresponding voltage to tuner; and to control the capacity of varicap diode in order to have high frequency tuner into proper channel. the voltage range of utc cw574 is required to cover necessary frequency range, and main issue of utc cw574 is its reliable voltage stability which avoids unexpec ted frequency offset; theref ore, the circuit of utc cw574 contains temperature compensation to have lowermost temperature coefficient. utc assumes no responsib ility 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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