2001 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
Features
Low Temperature Coefficient
Low Dynamic Resistance
Typical Reference Voltage of 33V
Description
The KA33V is a monolithic integrated voltage stabilizer
especially designed as voltage supplier for electronic tuners.
Schematic Diagram
R 4
D 1
D 2
D 3
D 4
D 5
Q 3
Q 2
R 3
R 2
R 1
2 C ath od e
1 A n od e
KA33V
Voltage Stabilizer
TO-92
1. Anode 2. Cathode
1
KA33V
2
Absolute Maximum Ratings (T
A= 25
C)
Electrical Characteristics (T
A
= 25
C)
Parameter
Symbol
Value
Unit
Zener Current
I
Z
10
mA
Power Dissipation (T
A
= 75
C)
P
D
200
mW
Operating Ambient Temperature Range
T
OPR
-20 ~ 75
C
Storage Temperature Range
T
STG
-40 ~ 125
C
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Stabilized Voltage
V
Z
I
Z
= 5mA
31
35
V
Stabilized Voltage-Temperature Drift
V
Z
/
T
I
Z
= 5mA
T
A
= -20 to 75
C
-1
0
1
mV/
C
Dynamic Resistance
R
Z
I
Z
= 5mA, f = 1KHz
-
10
25
-
KA33V
3
Measuring Circuits
Figure 1. Measuring Circuit for Stabilized Voltage V
Z
Figure 2. Measuring Circuit for Dynamic Resistance
KA33V
v
RB
EB
1
Volt Meter
A
2
IZ = 5mA
A
KA33V
EB
0.1
F
C
2
1
VV1
VV2
~
50
F
100
f = 1KHz
+
RB
Iz
IAC =
Iz
10
0 5mA
r
Z
= VV
1
0.5mA
5mA
Vz
IZ
Fig. 3
0.5mA
1
W1
KA33V
4
Typical Application
1) UHF Tuner
2) VHF Tuner
K A 3 3 V
1 5 K
1 5 K
1 5 K
V i
c
R i
2
1
C
c
A c h
B c h
Y c h
Z c h
C h a n n e l
s e ttin g
v a r ia b le
r e s is to r
to tu n in g d io d e s ( v a r a c t o r ) in c a s e o f Y c h o n
An
t
e
n
n
a
D 1
T R 1
D 2
D 3
D 5
D 4
T R 2
T R 1 : R F A M P : K S C 1 3 9 3
K S C 1 0 7 0 (U n d e r d e v e lo p m e n t)
T R 2 : O S C : S K C 1 7 3 0
D 1 - D 4 : 1 S 2 2 0 D 5 : M IX E R : 1 S S 1 6
A F C
te rm in a l
A
n
t
enn
a
D 1
T R 1
D 2
D 3
D 4
T R 3
T R 2
T R 1 : R M A M P : K S C 1 3 9 3
T R 2 : M IX E R : K S C 1 39 4
T R 3 : O S C : K S C 1 7 3 0
D 1, D 4 : 1S 2 2 0 9
D 2, D 3 : 1S 2 2 0 7
A F C te rm ina l
Lo w /H igh C h an n el
S w itc h in g te rm in al.
KA33V
5
Power-temperature Derating Durve Typical Characteristic Curves
(T
A
= 25
C)
Figure7. Allowable Dissipation vs.
Amblent Temperature
Figure8. Dynamic Resistance vs.
Zener Current
Figure9. Stabilized Voltage Temperature Drift vs.
Zener Current
Figure10. Stabilized Voliage Variation vs.
Time
Figure11. Stabilized Voltage Variation & Supply
Voltage Variation vs. Zener Current
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