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參數(shù)資料
| 型號： | TDA9535L |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PZIP11 |
| 封裝： | PLASTIC, CLIPWATT-11 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 1751K |
| 代理商： | TDA9535L |
TDA9535L
8/16
8 VIDEO RESPONSE OPTIMIZATION
The dynamic video response is optimized by care-
fully designing the supply decoupling of the video
board
(see
Section 8.1),
the
tracks
(see
Section 8.2), then by adjusting the input/output
component network (see Section 8.3).
For dynamic measurements such as rise/fall time
and bandwidth, a 8pF load is used (total load in-
cluding the parasitic capacitance of the PC board
and CRT Socket).
Figure 5. Video response optimization for one channel
8.1 - Supply decoupling
The decoupling of VCC and VDD through good
quality HF capacitors (respectively C10 and C12)
close to the device is necessary to improve the dy-
namic performance of the video signal.
8.2 - Tracks
Careful attention has to be given to the three out-
put channels of the amplifier.
– Capacitor: The parasitic capacitive load on the
amplifier outputs must be as small as possible.
Figure 11 clearly shows the deterioration of
the tR/tF when the capacitive load increases.
Reducing this capacitive load is achieved
moving away the output tracks from the other
tracks (especially ground) and by using thin
tracks (<0.5mm), see Figure 13.
– Cross talk: Output and input tracks must be set
apart. We recommend to install input and out-
put tracks on opposite sides of the amplifier.
Once again, this is achievable by using thin
tracks (<0.5 mm) to pass through the pin of the
device, see Figure 13 (b).
– Length: Connection between amplifier output
and cathode must be as short and direct as
possible.
8.3 - Network adjustment
Video response is always a compromise between
several parameters. An improvement of the rise/
fall time leads to a deterioration of the overshoot.
The recommended way to optimize the video re-
sponse is:
1
To set R10+R11 for arcing protection (min.
300
)
2. To adjust R20 and R10+R11.
Increasing their value increases the
tR/tF values and decreases the overshoot
3. To adjust L1
Increasing L1 speeds up the device and
increases the overshoot.
We recommend our customers to use the sche-
matic shown on Figure 5 as a starting point and
then to apply the optimization they need.
C24
4.7
F
C11
4.7
F
R10
L1
R11
CRT
R20
15/50
OUT
VCC
VDD
TDA9207
TDA9209
TDA9535L/36
GND
IN
150
150
0.39
H
(*): To be connected as close as possible to the device
C10(*)
100nF
C12(*)
100nF
GNDS
VREF
-
+
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