Datasheet STV5111 Datasheet (SGS Thomson Microelectronics)

RGB HIGH VOLTAGE VIDEO AMPLIFIER

■ 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 c an be used with both par­allel and sequential sampling applications.

STV5111

MULTIWA TT 15

(Plastic Package)

ORDER CODE: STV5111

Figure 1. PIN CONNECTIONS

Tab connected to Pin 8

15
14
13
12
11
10

BLUE FEEDBACK
BLUE CATHODE CURRENT
BLUE OUTPUT
GREEN FEEDBACK
GREEN CATHODE CURRENT

GREEN OUTPUT
9
8
7
6
5
4
3
2
1

RED FEEDBACK

GROUND

RED OUTPUT

RED CATHODE CURRENT

V HIGH VOLTAGE

DD

RED INPUT

GREEN INPUT

V LOW VOLTAGE

CC

BLUE INPUT

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STV5111

PIN FUNCTION

N° Function Description

1 Blue Input Input of the “blue” amplifier. It is a virtual ground with 2.5V bias voltage and 75µA

input bias current.

2 V

CC

3 Green Input Input of the “green” amplifier. It is a virtual ground with 2.5V bias voltage and 75µA

4 Red Input Input of the “red” amplifier. It is a virtual ground with 2.5V bias voltage and 75µA input

5 V

DD

6 Red Cathode Current Provides the video processor with a copy of the DC current flowing into the red

7 Red Output Output driving the red cathode. Pin 7 is internally protected against CRT arc

8 Ground Also connected to the heatsink.
9 Red Feedback Output driving the feedback resistor network for the red amplifier.
10 Green Output Output driving the green cathode. Pin 10 is internally protected against CRT arc

11 Green Cathode Current Provides the video processor with a copy of the DC current flowing into the green

12 Green Feedback Output driving the feedback resistor network for the green amplifier.
13 Blue Output Output driving the blue cathode. Pin 13 is internally protected against CRT arc

14 Blue Cathode Current Provides the video processor with a copy of the DC current flowing into the blue

15 Blue Feedback Output driving the feedback resistor network for the blue amplifier.

Low voltage power supply, typically 9V.

input bias current.

bias current.
High voltage power supply, typically 200V.

cathode, for automatic cut-off or gain adjustment. If this control is not used, Pin 6
must be grounded.

discharges by a diode limiting the output voltage to V

discharges by a diode limiting the output voltage to V

DD

DD

.

.

cathode, for automatic cut-off or gain adjustment. If this control is not used, Pin 11
must be grounded.

discharges by a diode limiting the output voltage to V

DD

.

cathode, for automatic cut-off or gain adjustment. If this control is not used, Pin 14
must be grounded.

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Figure 2. BLOCK DIAGRAM OF EACH CHANNEL

)

5

15

STV5111

(12, 9)

13

(10, 7

14

(11, 6)

GND

2

1

(3, 4)

8

REFERENCE

VOLTAGE

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STV5111

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

DD

V

CC

I

OD

I

OG

I

FD

I

FG

I

T

T

oper

T

stg

THERMA L D ATA

Symbol Parameter+ Value Unit

R

(j-c) Junction-Case Thermal Resistance Max. 3 °C/W

th

(j-a) Junction-Ambient Thermal Resistance Typ. 35 °C/W

R

th

Supply High Voltage Pin 5 250 V
Supply Low Voltage Pin 2 20 V
Output Current

to V

DD

to Ground

Output Current < 50µs duration
to V

DD

to Ground
Input Current Pins 1 - 3 - 4 60 mA

j

Junction Temperature 150 °C

j

Pins 7 - 10 - 13

Protected

8

Pins 9 - 12 - 15

45
45

Operating Ambient Temperature 0, + 70 °C

Storage Temperature - 20, + 150 °C

mA

mA
mA

ELECTRICAL CHARACTERISTICS (

V

CC

= 12V ; V

= 210V ; T

DD

amb

oC

= 25

; AV = 55 unless otherwise specified)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

DD

V

CC

I

DD

I

CC

V

sath

R

ON

High Supply Voltage (Pin5) 200 210 V
Low Supply Voltage (Pin 2) 7.5 9 10 V
High Voltage Supply Internal DC Current

(without current due to the feedback network)

V

OUT

= 100V

9.5 15 mA

Low Voltage Supply Internal DC Current 38 55 mA
Output Saturation Voltage (High level)

(Pins7-10-13)
Output Mos Transistor (Low level)

(Pins7-10-13)

IO = - 10µA

5V

1.7 k

Measured on CRT cathodes.

BW Bandwidth at - 3dB

(C
V

LOAD

OUT

= 10pF, R

= 100V, D V

PROTECT

OUT

= 1k

= 100VPP)

Ω

6MHz

Measured between 10% & 90% of

t

, t

R

F

G

O

Rise & Fall Time

Open Loop Gain 47 50 dB
Open Loop Gain Difference between

2channels

output pulse
(C

= 10pF, R

LOAD

= 100V, D V

V

OUT

PROTECT

= 100V

OUT

= 1k

Ω

PP

60 ns

-1.5 0 1.5 dB

Open Loop Gain Temperature Coefficient 0 dB/

= 2MHz, 70VPP sine wave,

V

OUT

V

= 170V, CL = 20pF

BLACK

= 68k

R

Ω

F

= 100V 2.3 2.5 2.7 V

OUT

3.6 dB/°C

V

P

REF

Internal Power Dissipation
(seecalculationbelow)

Internal Voltage Reference (Pins 1-3-4) V
Voltage Reference Temperature Coefficient 0 mV/°C

I

IB

R

Input Bias Current (Pins 1-3-4) V
Input Resistance 4k

I

= 100V 75

OUT

ESD ESD Human Body Model 1.2 kV

Ω

o

C

A

µ

Ω

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TYPICAL APPL ICATION

The STV5111 is composed of t hree 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 providin g a copy of the cath-

ode current,
– A protection diode against CRT arc discharges.

PC Board La y ou t

The best performanc es of the high vol tage video
amplifier will be obtained only with a carefully desi­gned PC board. Output to input capacitance is of
particular importance.
For a single amplifier, the input-output capaci­tance, 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 re­sistor and HF isolated printed wires are necessary.

Figure 3. Application Example

STV5111

Furthermore, capacitive coup ling 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
mation of the static power can be calculated by the
following equation:

The dynamic dissipation depends on the signal
spectrum, V

For a sine wave, dynamic dissipation is
P

The load capacitance C
capacitance (10pF), and a mplifier output capaci­tance (8pF) : total C

(DC), VDD and RF. Reasonable approxi-

OUT

3V

DDVDDVOUT

-----------------------------------------------

Ps

OUT

= 3 x F x CL x V

d

–()

40K

, VDD and the load capacitance.

OPP

value is about 20pF.

L

3V

OUTVDDVOUT

--------------------------------------------------+=

x 0.8 x VDD.

includes CRT and board

L

–()

R

F

VCC 9V

100

V

200V

V

DD

V

DD

V

DD

STV5111

100nF

9

7

6

12

10

11

15

13

14

F

m

1.2k

1.8k

100nF

2

8 5

W

68k

4

W

W

V

REF

3

1

470pF

W

470

4.7k

DD

10

F

m

1k

W

CATHODE 1

W

CATHODE 2

CATHODE 3

CUT-OFF
SAMPLING

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STV5111

PACKAGE MECHANICAL DATA

15 PINS - PLASTIC MULTIWATT

Figure 4. 15-Pin Package

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STV5111

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