TEA2037A datasheet(4/9 Pages) STMICROELECTRONICS

Nome de Peças	TEA2037A

Descrição Electrónicos	HORIZONTAL AND VERTICAL DEFLECTION MONITOR

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Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	http://www.st.com

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ELECTRICAL CHARACTERISTICS (Tamb =25

oC) (continued)

Symbol

Parameter

Min.

Typ.

Max.

Unit

FRAME OUTPUT (PIn 8)

LV8A

LV8B

Saturation Voltage to Ground (V7 = 30V)

I8 = 0.1

I8 =1A

0.0.6

0.37

0.6

1

V

HV8A

HV8B

Saturation Voltage to V7 (V7 = 30V)

I8 = -0.1

I8 = -1A

1.3

1.7

1.6

2.4

V

FV8A

FV8B

Saturation Voltage to V7 in Flyback Mode (V8 >V7)

I8 = 0.1

I8 =1A

1.6

2.5

2.1

4.5

V

FLYBACK GENERATOR (Pins 2 and 3)

F2DA

F2DB

FSVA

FSVB

Flyback Transistor on (output = high state) (V2 = 30V)

V3/2 with I3 → 2 = 0.1A

I3 → 2 =1A

V2/3 with I3 → 2 = 0.1

I3 → 2 =1A

1.5

3.0

0.8

2.2

2.1

4.5

1.1

4.5

V

Flyback Transistor off (output = V7 - 8V) (V7 =V2 = 30V)

FCI

Leakage Current Pin 2

170

µA

The TEA2037A performs all the video and power

functions required to provide signals for the direct

drive of the line darlington and frame yoke.

It contains :

- A shunt regulator

- A synchronization separator

- An integrated frame separator without external

components

- A saw-tooth generator for the frame

- A power amplifier for direct drive of frame yoke

(short circuit protected)

- An open collector output for the line darlington drive

- A line phasedetector and a voltage control oscillator

15

V

R

Video

SL1 SL2

R2

R1

Figure 1 : Synchronization Separator Circuit

Q3

Q4

V

Z/2

SL1

3I

I

ST1

ST2

V

Z

Figure 2 : Frame Separator

The slice level of sync-separation is fixed by value

of the external resistors R1 and R2.VR is an inter-

nally fixed voltage.

The sync-pulse allows the discharge of the capaci-

tor by a 2 x 1 current. A line sync-pulse is not able

to discharge the capacitor under VZ/2. Aframe sync

pulse permits the complete discharge of the ca-

pacitor, so during the frame sync-pulse Q3 and Q4

provide current for the other parts of the circuit.

The oscillator thresholds are internally fixed by

resistors. The discharge of the capacitor depends

on the internal resistor R4. The control voltage is

applied on resistor R5.

TEA2037A

4/9

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