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PDF STV5111 Data sheet ( Hoja de datos )
| Número de pieza | STV5111 | |
| Descripción | RGB HIGH VOLTAGE VIDEO AMPLIFIER | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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STV5111
RGB HIGH VOLTAGE VIDEO AMPLIFIER
s Bandwidth : 6MHz typical
s Supply Voltage : 200V typical
s Rise and Fall Time : 60ns TYPICAL
s CRT Cathode Current Outputs for Parallel or
Sequential Cut-off or Drive Adjustment
s Flashover Protection
DESCRIPTION
The STV5111 includes three video amplifiers
desi-gned with a high voltage bipolar/CMOS/
DMOS technology (BCD). It drives directly the
three cathodes and is protected against
flashovers. Thanks to its three cathode current
outputs, the STV5111 can be used with both par-
allel and sequential sampling applications.
MULTIWATT 15
(Plastic Package)
ORDER CODE: STV5111
Figure 1. PIN CONNECTIONS
Tab connected to Pin 8
September 2003
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
BLUE FEEDBACK
BLUE CATHODE CURRENT
BLUE OUTPUT
GREEN FEEDBACK
GREEN CATHODE CURRENT
GREEN OUTPUT
RED FEEDBACK
GROUND
RED OUTPUT
RED CATHODE CURRENT
VDD HIGH VOLTAGE
RED INPUT
GREEN INPUT
VCC LOW VOLTAGE
BLUE INPUT
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1
1 page  
TYPICAL APPLICATION
The STV5111 is composed of three independent
amplifiers, each of them including :
– A differential amplifier, the gain of which is fixed
by external feedback resistors,
– A voltage reference,
– A PMOS transistor providing a copy of the cath-
ode current,
– A protection diode against CRT arc discharges.
PC Board Layout
The best performances of the high voltage video
amplifier will be obtained only with a carefully desi-
gned PC board. Output to input capacitance is of
particular importance.
For a single amplifier, the input-output capaci-
tance, in parallel with the relatively high feedback
resis-tance, creates a pole in the closed-loop
transfer function.
A low parasitic capacitance (0.3pF) feedback re-
sistor and HF isolated printed wires are necessary.
Figure 3. Application Example
STV5111
Furthermore, capacitive coupling from the output
of an amplifier toward the input of another one may
induce excessive cross-talk.
Power Dissipation
The power dissipation consists of a static part and
a dynamic part. The static dissipation is a function
of VOUT(DC), VDD and RF. Reasonable approxi-
mation of the static power can be calculated by the
following equation:
Ps = 3----V----D---D----(--V--4--D-0--D--K--–-----V----O---U---T---)- + -3---V----O----U---T--(---V--R--D---FD----–-----V----O---U---T---)
The dynamic dissipation depends on the signal
spectrum, VOUT, VDD and the load capacitance.
For a sine wave, dynamic dissipation is
Pd = 3 x F x CL x VOPP x 0.8 x VDD.
The load capacitance CL includes CRT and board
capacitance (10pF), and amplifier output capaci-
tance (8pF) : total CL value is about 20pF.
VCC 9V
100m F
100nF
100nF
285
9
VDD
VDD 200V
10m F
1.2kW
1.8kW
4
VREF
7
6
12
VDD
1kW
4.7kW
CATHODE 1
10
3
11
15
VDD
CATHODE 2
13
1
14
STV5111
CATHODE 3
CUT-OFF
SAMPLING
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1
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