參數(shù)資料
型號(hào)： DDP3310B
廠商： MICRONAS SEMICONDUCTOR HOLDING AG
元件分類： 消費(fèi)家電
英文描述： Display and Deflection Processor
中文描述： SPECIALTY CONSUMER CIRCUIT, PQCC68
封裝： PLASTIC, LCC-68
文件頁(yè)數(shù)： 15/60頁(yè)
文件大?。?/td> 1540K
代理商： DDP3310B
ADVANCE INFORMATION
DDP 3310B
Micronas
15
2.2.5. Average Beam Current Limiter
The average beam current limiter (BCL) works on both
the digital YUV input and the inserted analog RGB sig-
nals by using either the sense input or the RSW1 input
for the beam current measurement. The BCL uses a
different filter to average the beam current during the
active picture resulting in a 12-bit resolution. The filter
bandwidth is approximately 4 kHz.
The beam current limiter allows the setting of a thre-
shold current, a gain and an additional time constant. If
the beam current is above the threshold, the excess
current is low-pass filtered with the according gain and
time constant. The result is used to attenuate the RGB
outputs by adjusting the white-drive multipliers for the
internal (digital) RGB signals and the analog contrast
multipliers for the analog RGB inputs, respectively. The
lower limit of the attenuator is programmable, thus a
minimum contrast can always be set. If the minimum
contrast is reached, the brightness will be decreased
down to a programmable minimum as well. Typical
characteristics of the BCL for different loop gains are
shown in Fig. 2
–
12; for this example the tube has been
assumed to have square-law characteristics.
Fig. 2
–
12:
Beam current limiter characteristics:
beam current output vs. drive
Drive
B
Threshold
gain = 0 %
gain = 60 %
gain = 90 %
gain = 10 %
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