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參數(shù)資料
| 型號(hào)： | TDA9105A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | DEFLECTION PROCESSOR FOR MULTISYNC MONITORS |
| 中文描述： | 偏轉(zhuǎn)處理器多同步監(jiān)測儀 |
| 文件頁數(shù)： | 18/31頁 |
| 文件大?。?/td> | 340K |
| 代理商： | TDA9105A |
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20
21
H-DRIVE
V
CC
20
21
H-DRIVE
V
CC
9
Figure 19 :
Output stage simplified diagram,
showing the two possibilitiesof
connection
OPERATING DESCRIPTION
(continued)
Output Section
The H-drive signal is transmitted to the output
through a shaping block ensuring a duty cycle
adjustablefrom 30% to 50%. In order to ensure a
reliable operation of the scanning power part, the
outputis inhibitedin the following circumstances:
- V
CC
too low,
- Xrayprotection activated,
- During the horizontalflyback,
- Outputvoluntarily inhibitedthrough Pin 4.
Theoutputstageis composedof aDarlingtonNPN
bipolartransistor.Boththe collectorand theemitter
areaccessible(see Figure 16).
TheoutputDarlingtonis inoff-statewhenthepower
scanningtransistoris alsoin off-state.
The maximum output current is 20mA, and the
correspondingvoltagedropof theoutputdarlington
is 1.1Vtypically.
It is evident that the power scanning transistor
cannot be directly driven by the integrated circuit.
Aninterfacehas to bedesignedbetweenthecircuit
andthe power transistorwhichcan be of bipolaror
MOStype.
Outputs inhibition
Theapplicationof a voltagelowerthan1V(typ.)on
Pin4 (dutycycle adjust)inhibits the horizontaland
verticaloutputs. This is not memorised.
LOGIC
BLOCK
V-fly
Vsync
V sawtooth
retrace time
H-fly
to 2NDPLL
H OUTPUT
INHIBITION
V OUTPUT
INHIBITION
COMPOSITE
BLANKING
S
R
Q
H-Duty cycle
1V
Flyback
0.7V
XRAY
V
CC off
REF
V
CC
XRAYProtection
Inhibition
V
CC
Checking
9
Figure 20 :
SafetyFunctions Block Diagram
X-RAYPROTECTION : the activationof the X-ray
protectionis obtainedby applicationof a highlevel
on the X-ray input (>8V). Consequencesof X-ray
protectionare :
- Inhibitionof H drive output,
- Activationof composite blankingoutput.
The reset of this protection is obtained by V
CC
switch off (see Figure 17).
TDA9105A
18/31
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