參數(shù)資料
型號(hào)： DDP3310B
廠商： MICRONAS SEMICONDUCTOR HOLDING AG
元件分類(lèi)： 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)： 17/60頁(yè)
文件大?。?/td> 1540K
代理商： DDP3310B
ADVANCE INFORMATION
DDP 3310B
Micronas
17
2.3.3. Soft Start/Stop of Horizontal Drive
In order to increase the energy supply of the horizontal
deflection stage smoothly, a soft start decreases the
drive frequency from 55 kHz to 31.25 kHz within
85 ms. The High time t
H
is always 14.4
μ
s. This
means, the duty factor decreases from 79.2 % to 45 %
(see Fig. 2
–
14).
The soft stop is needed, when the protection circuitry
wants to turn off the H-Drive. It has the inverse behav-
ior of the soft start and ends with a High level at the
HOUT Pin.
Fig. 2
–
14:
Soft start with a duty factor of 14.4/32
...
...
t
H
= 14.4
μ
s
T = 1/31.25 kHz
T=1/55 kHz
...
85 ms
t
H
= 14.4
μ
s
Table 2
–
5:
Allowed Horizontal Frequencies
Supply
Clock
(MHz)
Pixels per
Line
Supply Clk
Main
Clock
(in MHz)
Pixels per
line
Main Clk
Horizontal
Frequency
(Hz)
Minimum
H-Drive
Period
(in
μ
s)
Maximum
H-Drive
Period
(in
μ
s)
HFREQ
(I
2
C)
27
864
40.5
1296
31.24968
29.60
34.40
000
27
858
40.5
1287
31.46853
29.60
34.40
010
27
800
40.5
1200
33.750
28.80
30.60
100
27
768
40.5
1152
35.15625
27.80
29.20
001
27
720
40.5
1080
37.500
25.60
28.00
101
27
712
40.5
1068
37.92135
25.60
28.00
110
32
1024
40.0
1280
31.24952
29.60
34.40
000
32
944
40.0
1180
33.89776
28.80
30.60
100
32
912
40.0
1140
35.08747
27.80
29.20
001
32
852
40.0
1065
37.55869
25.60
28.00
101
32
844
40.0
1055
37.91469
25.60
28.00
110
40.5
1296
40.5
1296
31.24968
29.60
34.40
000
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