Datasheet

UNISONIC TECHNOLOGIES CO., LTD
CW574
LINEAR INTEGRATED CIRCUIT
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
Lead Free
CW574L-T90-B
CW574L-T90-K
CW574L-T90-R
„
Halogen Free
CW574G-T90-B
CW574G-T90-K
CW574G-T90-R
Package
Packing
TO-92-2
TO-92-2
TO-92-2
Tape Box
Bulk
Tape Reel
BLOCK DIAGRAM
1
2
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Copyright © 2011 Unisonic Technologies Co., Ltd
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CW574
„
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (TA=25°C)
PARAMETER
SYMBOL
RATINGS
UNIT
Stable Current
IZ
10
mA
Power Dissipation
PD
200
mW
Operating Temperature
TOPR
-20 ~ +75
°C
Storage Temperature
TSTG
-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 (TA=25°C)
PARAMETER
Stable Voltage
Dynamic Resister
Stable Current and
Temperature Characteristics
SYMBOL
TEST CONDITIONS
VZ
IZ=5mA
RZ
IZ=5mA,IAC=0.5mA,f=1kHz
ΔVZ
IZ=5mA, TA= -20~75°C
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
MIN
31
-1.0
TYP
33
10
MAX
35
25
UNIT
V
Ω
1.0
mV/°C
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CW574
LINEAR INTEGRATED CIRCUIT
APPLICATION CIRCUIT
„
115V
Rs
TUNER CONTROL
A
Vi
R2
R3
2
R10
AGC
Bu
BV
BL
AFT
VT
33V
1
+B
R11
R12
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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