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參數(shù)資料
| 型號： | KB2512 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 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)： | 29/36頁 |
| 文件大小： | 365K |
| 代理商： | KB2512 |
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DEFLECTION PROCESSOR FOR MULTISYNC MONITORS KB2512
28
Output Section
The H-drive signal is transmitted to the output through a shaping block ensuring TS and I
2
C adjustable duty cycle.
In order to secure scanning power part operation, the output is inhibited in the following circumstances:
Vcc and V
DD
too low
XRAY protection activated
During horizontal Flyback
H Drive I
2
C bit control is off.
The output stage is composed of a NPN bipolar transistor. Only the collector is accessible (see Figure 10).
The output NPN is in off-state when the power scanning transistor is also in off-state.
The maximum output current is 30mA, and the corresponding voltage drop of the output V
CEsat
is 0.4V Max.
It is evident that the power scanning transistor cannot be directly driven by the integrated circuit. An interface has
to be designed between the circuit and the power transistor which can be of bipolar or MOS type.
X-RAY Protection
The activation of the X-ray protection is obtained 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 V
DD
switch off or by I
2
C (see Figure 11).
Vertical Dynamic Focus
The KB2512 delivers a vertical parabola wave from on pin 10. 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
has to be connected to the CRT focusing grids.
Figure 10. Output Section
26 H-DRIVE
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