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參數(shù)資料
| 型號： | TDA9109/S |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 偏轉(zhuǎn) |
| 英文描述： | HORIZ/VERT DEFLECTION IC, PDIP32 |
| 封裝： | SHRINK, PLASTIC, DIP-32 |
| 文件頁數(shù)： | 13/30頁 |
| 文件大?。?/td> | 293K |
| 代理商： | TDA9109/S |
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BOUT
HORIZONTAL
OUTPUT
INHIBITION
VERTICAL
OUTPUT
INHIBITION
S
R
Q
Horizontal Flyback
0.7V
XRAY Protection
V
CC Checking
V
CC
V
CC or VDD off or I
2
C Reset
XRAY
VSCinh
I2C Drive on/off
I2C Ramp on/off
V
DD Checking
V
DD
VSDinh
9
1
0
9
S-
3
4
.EPS
Figure 14 : Safety Functions Block Diagram
OPERATING DESCRIPTION (continued)
II.4 - Output Section
The H-drive signal is sent to the output through a
shaping stage which also controls the H-drive duty
cycle (I
2C adjustable) (see Figure 11). In order to
secure the scanning power part operation, the
output is inhibited in the following cases :
- when VCC or VDD are too low,
- when the XRAY protection is activated,
- during the Horizontal flyback,
- when the HDrive I
2C bit control is off.
The output stage consists of a NPN bipolar transis-
tor. Only the collector is accessible (see Figure 13).
This output stage is intended for "reverse" base
control, where setting the output NPN in off-state
will control the power scanning transistor in off-
state (see Application Diagram).
The maximum output current is 30mA, and the
corresponding voltage drop of the output VCEsat is
0.4V Max.
Obviously the power scanning transistor cannot be
directly driven by the integrated circuit. An interface
has to be added between the circuit and the power
transistor either of bipolar or MOS type.
II.5 - X-RAY Protection
The X-Ray protection is activated by application of
a high level on the X-Ray input (8V on Pin 25).
It inhibits the H-Drive and B+ outputs.
This protection is latched ; it may be reset either by
VCC or VDD switch off or by I
2C (see Figure 14).
20k
W
Q1
GND 0V
12
HFLY
400
W
91
09
S
-3
2
.E
P
S
Figure 12 : Flyback Input Electrical Diagram
H-DRIVE
26
VCC
91
09
S
-3
3
.E
P
S
Figure 13
II.6 - Vertical Dynamic Focus
The TDA9109/S delivers a vertical parabola wave-
form on Pin 10.
This vertical dynamic focus is tracked with VPOS
and VAMP. Its amplitude can be adjusted. It is also
affected by S and C corrections. This positive signal
once amplified is to be sent to the CRT focusing
grids.
TDA9109/S
20/30
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