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參數(shù)資料
| 型號： | TDA9109A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | LOW-COST I2C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITOR |
| 中文描述： | 低費(fèi)用的I2C可控?fù)隙榷嗤斤@示器處理器 |
| 文件頁數(shù)： | 32/47頁 |
| 文件大?。?/td> | 509K |
| 代理商： | TDA9109A |
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TDA9109A
32/47
2.4 Output Section
The H-drive signal is sent to the output through a
shaping stage which also controls the H-drive duty
cycle (I
2
C adjustable) (see Figure 11). In order to
secure thescanning power part operation, the out-
put is inhibited in the following cases:
when V
CC
or V
DD
are too low
when the XRAY protection is activated
during the Horizontal flyback
The output stage consists of a NPN bipolar tran-
sistor. Only the collector is accessible
(see Figure 13).
when the HDrive I
2
C bit control is off
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.
The maximum output current is 30mA, and the
corresponding voltage drop of the output V
CEsat
is
0.4V Max.
Obviously thepower scanning transistor cannot be
directly driven by the integrated circuit. An inter-
face has to be added between the circuit and the
power transistor either of bipolar or MOS type.
2.5 X-RAY Protection
The X-Ray protection is activated by application of
a high level on theX-Ray input (8.2V onPin 25). It
inhibits the H-Drive and B+ outputs.
This activation is internally delayed by 2 lines to
avoid erratic detection (short parasitics).
This protection is latched; it maybe reset either by
V
CC
switch off or by I
2
C (see Figure 14).
Figure 14. Safety Functions Block Diagram
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