ca3224 Intersil Corporation, ca3224 Datasheet - Page 5

• Manufacturer Part Number: ca3224
• Description: Automatic Picture Tube Bias Control Circuit
• Manufacturer: Intersil Corporation

NOTE:
3. One of three identical driver circuits shown.
SET-UP
CHROMA/
CIRCUIT
NEG. TRANSIENT
LUMA
SUBSTRATE
PROTECT
FIGURE 5. PICTURE TUBE V-I CURVE
B
PROGRAM
RGB TO
BLACK LEVEL
AUTO-BIAS PULSE
G
R
B
TO B
DRIVER
V
A
CATHODE GRID
2.7K
R
HOLD
SENSE
TO R
DRIVER
(A)
-24V
FIGURE 6A.
TRANSIENT
BIAS
9.1K
POSITIVE
PROTECT
20K
5K
(V)
+12V
+230V
R
160K
2.7K
TO ACTIVE
CIRCUIT
FB
Q
CATH
DRIVE
Q
BIAS
FIGURE 4. TYPICAL APPLICATION CIRCUIT
12K
R
560
1%
2.2K
1
200
2
39K
S
1%
R
0
FIGURE 6. TRANSIENT PROTECTION
1
SUMMING POINT
I
CATHODE
V
R
62K
1%
(mA)
TO R
TO B
R
S
2
B
G
SG
CH
CH
D
C
1
CA3224E
1
0.12
R
B
IN
IN
8-60
Electrostatic Protection
When correctly designed for ESD protection, SCRs can be
highly effective, enabling circuits to be protected to well in
excess of 4kV. The SCR ESD-EOS protection structures used
on each terminal of the CA3224E are shown schematically in
either Figures 6A or 6B. Although ESD-EOS protection is
included in the CA3224E, proper circuit board layout and
grounding techniques should be observed.
NOTE: For further information on CA3224E protection structures refer
to: AN7304, “Using SCRs as Transient Protection Structures in
Integrated Circuits”, by L.R. Avery. Intersil AnswerFAX (407-724-7800)
document #97304.
G
0.047
IN
0.047
0.047
+10V
C
C
1
2
3
4
5
6
7
12
22
9
13
TRANSIENT
NEGATIVE
+
PROTECT
CA224E
33 F
21
20
19
18
17
16
15
14
10
11
8
R
HOLD
(B)
+
+
+
C
3.9K
2
G
TRANSIENT
10 F
10 F
10 F
FIGURE 6B.
PROTECT
OUT
POSITIVE
+
20K
R
R
G
B
AUTO BIAS
LEVEL ADJUST
HORIZONTAL
INPUT
VERTICAL
INPUT
SENSE
OUT
IN
OUT
47 F
(Note)
Q
3
GRID PULSE
AMPLIFIER
INVERTER
1.5K
10K
TO ACTIVE
CIRCUIT
+10V