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參數(shù)資料
| 型號： | LM1229VEC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | I2C Compatible CMOS TV RGB and Deflection Processor |
| 中文描述： | WAVEFORM GENERATION, PQFP64 |
| 封裝： | PLASTIC, QFP-64 |
| 文件頁數(shù)： | 15/27頁 |
| 文件大?。?/td> | 969K |
| 代理商： | LM1229VEC |
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Application Information
(Continued)
Pin
No.
51
Pin Name
Schematic
Description
ABL
The Automatic Beam Limiter input is biased to
the desired beam current limit by R
ABL
and V
BB
and normally keeps D
INT
and the 1N4148
forward biased. When the current resupplying
the CRT capacitance (averaged by C
ABL
)
exceeds this limit, then D
INT
and the 1N4148
begin to turn off and the voltage at pin 51 begins
to drop. The LM1229 then lowers the gain of the
three video channels until the beam current
reaches an equilibrium value. The 1N4148 is
needed to prevent overcurrent in D
INT
in cases
where the ABL limit is greater than 1 mA.
External current set resistor, 10k 1%, sets the
internal bias current level for optimum
performance of the LM1229. This resistor should
be placed as close to pin 53 and the pin 52
ground return as possible.
53
V
REF
R
EXT
57
58
59
Blue Output
Red Output
Green Output
These are the three video output pins. They are
intended to drive the National family of cathode
drivers. Nominally, about 2.8V peak to peak will
produce 140V peak to peak of cathode drive with
the LM2426.
62
Vertical Flyback
This input is used to start the VBLANK output
pulse which is used internally for vertical
blanking of the RGB outputs. It is also used for
the V Protect function which blanks the RGB
video outputs if the vertical deflection fails. The
values of C
V
and R
V
should be chosen to
eliminate the long vertical rate slope at pin 62
and also ensure that this pin is not forced above
V
CC
or below GND. The bias level at this pin is
about 25% of V
CC
and the actual switching
threshold is about 35% of V
CC
.
L
www.national.com
15
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