TDA9533 STMicroelectronics, TDA9533 Datasheet - Page 10

• Manufacturer Part Number: TDA9533
• Manufacturer: STMicroelectronics

Specifications of TDA9533

• Single Supply Voltage (typ): Not RequiredV
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Mounting: Through Hole
• Lead Free Status / RoHS Status: Supplier Unconfirmed

TDA9533
8 - VIDEO RESPONSE OPTIMIZATION
The dynamic video response is optimized by care-
fully designing the supply decoupling of the video
board (see 8.1), the tracks (see 8.2), then by ad-
justing the input/output component network (see
8.3).
Figure 5. Video response optimization for one channel
8.1 - Supply decoupling
The decoupling of V
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 must be given to the three output
channels of the amplifier.
– Capacitor: The parasitic capacitive load on the
– Cross talk: Output and input tracks must be set
– Length: Connection between amplifier output
10/16
TDA9207
TDA9209
(
amplifier outputs must be as small as possible.
Figure 11 clearly shows the deterioration of the
t
ing this capacitive load is achieved moving away
the output tracks from the other tracks (especial-
ly ground) and by using thin tracks (<0.5mm),
see Figure 12.
apart.
and cathode must be as short and direct as pos-
sible.
*
R
): To be connected as close as possible to the device
/t
F
when the capacitive load increases. Reduc-
15/50
R20
4.7 F
Cut-off
C11
CC
IN
and V
TDA9533/30
V
CC
DD
through good
C10(
100nF
Vref
GNDS
*
)
C12(
100nF
V
*
DD
)
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).
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:
We recommend our customers to use the sche-
matic shown on Figure 5 as a starting point for the
video board design and then to apply the optimiza-
tion they need.
GND
1
2
3
To set R10+R11 for arcing protection
(min. 300 )
To adjust R20 and R10+R11.
Increasing their value increases the
t
To adjust L1
Increasing L1 speeds up the device and
increases the overshoot.
R
/t
OUT
F
4.7 F
C24
values and decrease the overshoot
150
R10
0.39 H
L1
150
R11
CRT