UTC CW574
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R111-008,B
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.
BLOCK DIAGRAM
1
2
TO-92-2
1
2
TO-92-2: 1: Output 2: GND
PIN FUNCTION
PIN SYMBOL FUNCTION
1 GND GROUND
2 OUT
OUTPUT
(31~35V)
ABSOLUTE MAXIMUM RATINGS
(Tamb=25
C)
PARAMETER SYMBOL
MIN.
MAX.
UNIT
Stable Current
Iz 10 mA
Power Dissipation
P
D
200 mW
Operating Temperature
T
amb
-20 75
C
Storage Temperature
T
STG
-40 125
C
UTC CW574
LINEAR INTEGRATED CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R111-008,B
ELECTRICAL CHARACTERISTICS
(Tamb=25
C)
PARAMETER SYMBOL
TEST
CONDITIONS
MIN
TYP
MAX
UNIT
Stable Voltage
Vz
Iz=5mA 31
33
35
V
Dynamic Resister
Rz
Iz=5mA,I
AC
=0.5mA,f=1kHz
10 25
Stable Current And
Temperature Characteristics
Vz
Iz=5mA, Tamb= -20~75
C -1.0 1.0
mV/
C
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
.
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