TEA5101A.PDF

TEA5101A

RGB HIGH VOLTAGE VIDEO AMPLIFIER

. BANDWIDTH : 10MHz TYPICAL

. CRT CATHODES CURRENT OUTPUTS FOR

PARALLEL OR SEQUENTIAL CUT-OFF OR

DRIVE ADJUSTMENT

. POWER DISSIPATION : 3.5W

DESCRIPTION

The TEA5101A includes three video amplifiers

desi-gned with a high voltage DMOS/bipolar tech-

nology. It drives directly the three CRT cathodes.

The device is protected against flashovers. Due to

its three cathode current outputs, the TEA5101A

can be used with both parallel and sequential sam-

pling applications.

MULTIWATT 15

(Plastic Package)

ORDER CODE : TEA5101A

PIN CONNECTIONS (top view)

BLUE FEEDBACK

BLUE CATHODE CURRENT

BLUE OUTPUT

GREEN FEEDBACK

GREEN CATHODE CURRENT

GREEN OUTPUT

RED FEEDBACK

GROUND

RED OUTPUT

RED CATHODE CURRENT

HIGH VOLTAGE

RED INPUT

GREEN INPUT

LOW VOLTAGE

BLUE INPUT

Tab connected to Pin 8

June 1993

1/6

. RISE AND FALL TIME : 50ns TYPICAL

. FLASHOVER PROTECTION

. ESD PROTECTED

TEA5101A

PIN FUNCTION

Function

Description

Blue Input

Input of the ”blue” amplifier. It is a virtual ground with 3.8V bias voltage,

15 microamperes input bias current with 14k

input resistance.

Low voltage power supply, typically 12V.

Green Input

See Pin 1.

Red Input

See Pin 1.

High voltage power supply, typically 200V.

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 heat sink.

Red Feedback

Output driving the feedback resistor network for the red amplifier.

Green Output

See Pin 7.

Green Cathode Current

See Pin 6.

Green Feedback

See Pin 9.

Blue Output

See Pin 7.

Blue Cathode Current

See Pin 6.

Blue Feedback

See Pin 9.

BLOCK DIAGRAM OF EACH CHANNEL

V DD

(12, 9)

40k W

20k

(10, 7)

0.8k

(11, 6)

1k W

2.5k

(3, 4)

6k W

3pF

350 W

1.5k

GND

2/6

TEA5101A

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

V DD

Supply High Voltage

Pin 5

250

V CC

Supply Low Voltage

Pin 2

Output Current

to V DD

to Ground

Pins 7 - 10 - 13

I O

Protected

I F

Output Current

to V DD

to Ground

Pins 9 - 12 - 15

I j

Input Current

Pins 1 - 3 - 4

T j

Junction Temperature

150

T oper

Operating Ambient Temperature

0 to 70

T stg

Storage Temperature

– 55 to + 150

THERMAL DATA

Symbol

Parameter

Value

Unit

R th (j-c) Maximum Junction Case Thermal Resistance

Max.

C/W

R th (j-a) Typical Junction Ambient Thermal Resistance

Typ.

C/W

ELECTRICAL CHARACTERISTICS

T amb =25 o C;V CC = 12V ; V DD = 200V ; AV = 50 (unless otherwise specified)

Symbol

Parameter

Min. Typ. Max. Unit

V DD

High Supply Voltage

Pin 5

200 220

V CC

Low Supply Voltage

Pin 2

I DD

High Voltage Supply Internal DC Current (V out 100V)

(without the current due to the feedback network )

Pin 5

I CC

Low Voltage Supply DC Current

Pin 2

V sath

Output Saturation Voltage (High level)

I O =–10

Pins 7-10-13

R ON

Output Mos Transistor (Low level)

R ON @I O =3mA

Pins 7-10-13

1.7

Bandwidth (– 3db) (measured on CRT cathodes)

(C LOAD : 10pF – R Protect = 1k

–V out = 100V)

V out :50V PP

MHz

V out : 100 V PP

T R -T F Rise Time and Fall Time : measured between 10% and 90% of output

pulse (C LOAD : 10 pF – R Protect = 1 k

–V out = 100 V)

V out : 100 V PP

G O

Open Loop Gain

Internal Power Dissipation (see calculation below)

3.5

V REF

Internal Voltage Reference

Pins 1-3-4

3.55 3.8 4.05

Internal Reference Voltage Difference Between 2 Channels

Voltage Reference Temperature Coefficient

– 5

mV/ ° C

I IB

Input Bias Current (V out : 100 V)

Pins 1-3-4

R I

Input Resistance

k W

3/6

TEA5101A

TYPICAL APPLICATION

The TEA5101A consists of three independent am-

plifiers. Each of them includes :

- 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.

V DD 200V

V CC 12V

10 m F

4.7

39k

V DD

1nF

10pF*

220

CATHODE 1

* optional

1.8k

V REF

V DD

220 W

V DD

CUT-OFF

SAMPLING

TEA5101A

4/6

TEA5101A

APPLICATION INFORMATION

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 capacitances are

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 trans-

fer function. A low parasitic capacitance (0.3pF)

feedbackresistor and HF isolated printed wires are

necessary. Further more, capacitive coupling from

the output of an amplifier toward the input of an-

other one may induce excessive crosstalk.

V OUT first value (100V) will be the reference.

The dynamic dissipation depends on the signal

spectrum and the load capacitance.

- Dynamic power with a typical picture with 150 V pp

modulation is typically 1W.

- For a sine wave, dynamic dissipation per amplifier

is P d =FxC l xV opp xV dd x 0.8.

The load capacitance C L includes CRT and board

capacitance (10pF), and amplifier output capaci-

tance (8pF) : total C L value is about 20pF. For a

5MHZ, 50 V pp sine wave and a 20pF load capaci-

tance, the maximum dynamic power is 2.5W.

- Generally, the maximum dynamic power is

reached with a white noise (tuner noise).

- Typical value is about 2W.

Total dissipation is typically 3.6W (2.6W + 1W).

With a maximum static dissipation of 3.5W, total

dissipation is :

- 4.5W with a typical picture (UER pattern)

- 5.5W with white noise

POWER DISSIPATION

The power dissipation consists of a static part and

a dynamic part. The static dissipation varies with

the output voltage. With V DD = 200V, P stat = 2.6W

typ(3.5W max) at V OUT = 100V, 1.5W typ at 150V

and 3W typ at 50V (with R feedback = 39k

5/6

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