TDA9109 STMicroelectronics, TDA9109 Datasheet - Page 20

• Manufacturer Part Number: TDA9109
• Description: Multimedia Misc DISC BY STM 11/99
• Manufacturer: STMicroelectronics
• Type: Low Cost Deflection Processorr

Specifications of TDA9109

• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: Through Hole
• Package / Case: SPDIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TDA9109/S
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
secure the scanning power part operation, the
output is inhibited in the following cases :
- when V
- when the XRAY protection is activated,
- during the Horizontal flyback,
- when the HDrive I
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 V
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
V
Figure 14 : Safety Functions Block Diagram
20/30
CC
or V
2
C adjustable) (see Figure 11). In order to
DD
CC
switch off or by I
or V
V
CC
or V
DD
VSCinh
VSDinh
Horizontal Flyback
are too low,
2
DD
C bit control is off.
off or I
V
V
CC
DD
V
V
CC
DD
2
2
Checking
Checking
C Reset
C (see Figure 14).
XRAY
0.7V
XRAY Protection
S
R
CEsat
Q
is
Figure 12 : Flyback Input Electrical Diagram
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.
I
2
I
2
C Ramp on/off
C Drive on/off
HFLY
12
20k W
HORIZONTAL
OUTPUT
INHIBITION
VERTICAL
OUTPUT
INHIBITION
BOUT
GND 0V
V
400 W
26
CC
H-DRIVE
Q1