STV5111
RGB HIGH VOLTAGE VIDEO AMPLIFIER
s
s
s
s
s
Bandwidth : 6MHz typical
Supply Voltage : 200V typical
Rise and Fall Time : 60ns TYPICAL
CRT Cathode Current Outputs for Parallel or
Sequential Cut-off or Drive Adjustment
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
5111-01.eps
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
V
DD
HIGH VOLTAGE
RED INPUT
GREEN INPUT
V
CC
LOW VOLTAGE
BLUE INPUT
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STV5111
PIN FUNCTION
N°
1
2
3
4
5
6
Description
Input of the “blue” amplifier. It is a virtual ground with 2.5V bias voltage and 75µA
input bias current.
Low voltage power supply, typically 9V.
V
CC
Green Input
Input of the “green” amplifier. It is a virtual ground with 2.5V bias voltage and 75µA
input bias current.
Red Input
Input of the “red” amplifier. It is a virtual ground with 2.5V bias voltage and 75µA input
bias current.
High voltage power supply, typically 200V.
V
DD
Red Cathode Current Provides the video processor with a copy of the DC current flowing into the red
cathode, for automatic cut-off or gain adjustment. If this control is not used, Pin 6
must be grounded.
Red Output
Output driving the red cathode. Pin 7 is internally protected against CRT arc
discharges by a diode limiting the output voltage to V
DD
.
Ground
Also connected to the heatsink.
Red Feedback
Output driving the feedback resistor network for the red amplifier.
Green Output
Output driving the green cathode. Pin 10 is internally protected against CRT arc
discharges by a diode limiting the output voltage to V
DD
.
Green Cathode Current Provides the video processor with a copy of the DC current flowing into the green
cathode, for automatic cut-off or gain adjustment. If this control is not used, Pin 11
must be grounded.
Green Feedback
Output driving the feedback resistor network for the green amplifier.
Blue Output
Output driving the blue cathode. Pin 13 is internally protected against CRT arc
discharges by a diode limiting the output voltage to V
DD
.
Blue Cathode Current Provides the video processor with a copy of the DC current flowing into the blue
cathode, for automatic cut-off or gain adjustment. If this control is not used, Pin 14
must be grounded.
Blue Feedback
Output driving the feedback resistor network for the blue amplifier.
Function
Blue Input
7
8
9
10
11
12
13
14
15
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STV5111
Figure 2. BLOCK DIAGRAM OF EACH CHANNEL
15
(12, 9)
5
13
(10, 7)
14
(11, 6)
2
1
(3, 4)
REFERENCE
VOLTAGE
5111-02.eps
GND
8
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STV5111
ABSOLUTE MAXIMUM RATINGS
Symbol
V
DD
V
CC
I
OD
I
OG
I
FD
I
FG
I
j
T
j
T
oper
T
stg
Parameter
Supply High Voltage
Supply Low Voltage
Output Current
to V
DD
to Ground
Output Current < 50µs duration
to V
DD
to Ground
Input Current
Junction Temperature
Operating Ambient Temperature
Storage Temperature
Pin 5
Pin 2
Pins 7 - 10 - 13
Value
250
20
Protected
8
Pins 9 - 12 - 15
45
45
60
150
0, + 70
- 20, + 150
mA
mA
mA
°C
°C
°C
Unit
V
V
mA
Pins 1 - 3 - 4
THERMAL DATA
Symbol
R
th
(j-c)
R
th
(j-a)
Parameter+
Junction-Case Thermal Resistance
Junction-Ambient Thermal Resistance
Max.
Typ.
Value
3
35
Unit
°C/W
°C/W
ELECTRICAL CHARACTERISTICS (
V
CC
= 12V ; V
DD
= 210V ; T
amb
= 25
oC
; AV = 55 unless otherwise specified)
Symbol
V
DD
V
CC
I
DD
I
CC
V
sath
R
ON
BW
Parameter
Test Conditions
High Supply Voltage (Pin5)
Low Supply Voltage (Pin 2)
High Voltage Supply Internal DC Current
V
OUT
= 100V
(without current due to the feedback network)
Low Voltage Supply Internal DC Current
Output Saturation Voltage (High level)
I
O
= - 10µA
(Pins7-10-13)
Output Mos Transistor (Low level)
(Pins7-10-13)
Measured on CRT cathodes.
Bandwidth at - 3dB
(C
LOAD
= 10pF, R
PROTECT
= 1kΩ
V
OUT
= 100V, D V
OUT
= 100V
PP
)
Measured between 10% & 90% of
Rise & Fall Time
output pulse
(C
LOAD
= 10pF, R
PROTECT
= 1kΩ
V
OUT
= 100V, D V
OUT
= 100V
PP
Open Loop Gain
Open Loop Gain Difference between
2channels
Open Loop Gain Temperature Coefficient
Internal Power Dissipation
V
OUT
= 2MHz, 70V
PP
sine wave,
V
BLACK
= 170V, C
L
= 20pF
(seecalculationbelow)
R
F
= 68kΩ
Internal Voltage Reference (Pins 1-3-4)
V
OUT
= 100V
Voltage Reference Temperature Coefficient
Input Bias Current (Pins 1-3-4)
V
OUT
= 100V
Input Resistance
ESD Human Body Model
Min. Typ. Max. Unit
200 210
V
7.5
9
10
V
9.5
38
5
1.7
6
15
55
mA
mA
V
kΩ
MHz
t
R
, t
F
G
O
60
47
-1.5
50
0
0
3.6
2.3
2.5
0
75
4
2.7
1.5
ns
dB
dB
dB/
o
C
dB/°C
V
mV/°C
µA
kΩ
kV
P
V
REF
I
IB
R
I
ESD
1.2
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STV5111
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
V
CC
9V
100m F
V
DD
200V
10m F
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 V
OUT
(DC), V
DD
and R
F
. Reasonable approxi-
mation of the static power can be calculated by the
following equation:
3 V
DD
(
V
DD
–
V
OUT
)
3 V
OUT
(
V
DD
–
V
OUT
)
-
-
Ps
= ---------------------------------------------- + -------------------------------------------------
40 K
R
F
The dynamic dissipation depends on the signal
spectrum, V
OUT
, V
DD
and the load capacitance.
For a sine wave, dynamic dissipation is
P
d
= 3 x F x C
L
x V
OPP
x 0.8 x V
DD
.
The load capacitance C
L
includes CRT and board
capacitance (10pF), and amplifier output capaci-
tance (8pF) : total C
L
value is about 20pF.
100nF
2
8
5
100nF
68k
W
V
DD
470W
470pF
9
1kW
CATHODE 1
7
4
1.2kW
V
REF
1.8kW
12
V
DD
6
4.7k
W
10
3
11
CATHODE 2
15
V
DD
13
1
14
CATHODE 3
CUT-OFF
SAMPLING
STV5111
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