CW574

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,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 circuit 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 unexpected frequency offset; therefore, the circuit of UTC CW574

contains temperature compensation to have lowermost temperature coefficient.

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.