TDA9106A View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TDA9106A' PDF : 30 Pages View PDF
TDA9106A
OPERATING DESCRIPTION (continued)
Figure 16 : Output stage simplified diagram,
showing the two possibilities of
connection
21 VCC
20
VCC
H-DRIVE
21
H-DRIVE
20
- VCC too low
- Xray protection activated
- During horizontal flyback
- I2C bit control (voluntary inhibition by MCU).
The output stage is composed of a NPN Darlington
Figure 17 : Safety Functions Block Diagram
VCC Checking
VCC
Ref
bipolar transistor.
Both the collector and the emittor are accessible
(see Figure 16).
Theoutput Darlington is in off-statewhen the power
scanning transistor is also in off-state.
The maximum output current is 20mA, and the
correspondingvoltage drop of the output darlington
is 1.1V typically.
It is evident that the power scanning transistor
cannot be directly driven by the integrated circuit.
An interfacehas to be designed between the circuit
and the power transistor which can be of bipolar or
MOS type.
II.5 - X-RAY Protection
The activation of the X-Ray protection is obtained
by application of a high level on the X-Ray input
(Pin 15 > 8V). The consequenciesof X-Ray protec-
tion are :
- inhibition of H-Drive output
- activation of horizontal blanking output.
- activation of vertical blanking output.
The reset of this protection is obtained either by
VCC switch off or I2C resetby MCU (see Figure 17).
I2C Drive on/off
HORIZONTAL
OUTPUT
INHIBITION
XRAY Protection
XRAY
VCC off or I2C Reset
SQ
R
I2C Ramp on/off
VERTICAL
OUTPUT
INHIBITION
Horizontal Flyback
0.7V
I2C SFME
Horizontal Unlock
Horizontal Free Running Detection
I2C Blanking
HORIZONTAL
BLANKING
OUTPUT
Vertical Flyback
Vertical Sync
Vertical Sawtooth Retrace
Vertical Free Running Status
Vertical Unlock
I2C Ramp on/off
LOGIC
BLOCK
VERTICAL
BLANKING
OUTPUT
22/30
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