Philips tda3653b, tda3653 c DATASHEETS

INTEGRATED CIRCUITS

DATA SHEET

TDA3653B

TDA3653C

Vertical deflection and guard circuit (90˚)

Product specification			March 1991
File under Integrated Circuits, IC02

Philips Semiconductors	Product specification
Vertical deflection and guard circuit	TDA3653B
(90˚)	TDA3653C

GENERAL DESCRIPTION

The TDA3653B/C is a vertical deflection output circuit for drive of various deflection systems with currents up to 1.5 A peak-to-peak.

Features

∙ Driver

∙ Output stage

∙ Thermal protection and output stage protection

∙ Flyback generator

∙ Voltage stabilizer

∙ Guard circuit

QUICK REFERENCE DATA

PARAMETER	SYMBOL	MIN.	TYP.	MAX.	UNIT
Supply (note 1)
Supply voltage range
pin 9	VP = V9-4	10	−	40	V
pin 6	V6-4	−	−	60	V
Output (pin 5)
Peak output voltage during flyback	V5-4M	−	−	60	V
Output current	I5(p-p)	−	1.2	1.5	A
Operating junction temperature range	Tj	−25	−	+150	°C
Thermal resistance junction to mounting base
(SOT110B)	Rth j-mb	−	10	−	K/W
(SOT131)	Rth j-mb	−	3.5	−	K/W

Note to the quick reference data

1. The maximum supply voltage should be chosen such that during flyback the voltage at pin 5 does not exceed 60 V.

PACKAGE OUTLINES

TDA3653B: 9-lead SIL; plastic (SOT110B); SOT110-1; 1996 November 25.

TDA3653C: 9-lead SIL; plastic power (SOT131); SOT131-2 November 25.

March 1991

2

Philips Semiconductors	Product specification

Vertical deflection and guard circuit (90˚)

TDA3653B

TDA3653C

Fig.1 Block diagram.

March 1991

3

Philips Semiconductors	Product specification

Vertical deflection and guard circuit (90˚)

TDA3653B

TDA3653C

FUNCTIONAL DESCRIPTION

Output stage and protection circuit

Pin 5 is the output pin. The supply for the output stage is fed to pin 6 and the output stage ground is connected to pin 4. The output transistors of the class-B output stage can each deliver 0.75 A maximum.

The maximum voltage for pin 5 and 6 is 60 V.

The output power transistors are protected such that their operation remains within the SOAR area. This is achieved by the co-operation of the thermal protection circuit, the current-voltage detector, the short-circuit protection and the special measures in the internal circuit layout.

Driver and switching circuit

Pin 1 is the input for the driver of the output stage. The signal at pin 1 is also applied via external resistors to pin 3 which is the input of a switching circuit. When the flyback starts, this switching circuit rapidly turns off the lower output stage and so limits the turn-off dissipation. It also allows a quick start of the flyback generator.

External connection of pin 1 to pin 3 allows for applications in which the pins are driven separately.

Flyback generator

During scan the capacitor connected between pins 6 and 8 is charged to a level which is dependent on the value of the resistor at pin 8 (see Fig.1).

When the flyback starts and the voltage at the output pin (pin 5) exceeds the supply voltage, the flyback generator is activated.

The supply voltage is then connected in series, via pin 8, with the voltage across the capacitor during the flyback period. This implies that during scan the supply voltage can be reduced to the required scan voltage plus saturation voltage of the output transistors.

The amplitude of the flyback voltage can be chosen by changing the value of the external resistor at pin 8.

It should be noted that the application is chosen such that the lowest voltage at pin 8 is > 2.5 V, during normal operation.

Guard circuit

When there is no deflection current and the flyback generator is not activated, the voltage at pin 8 reduces to less than 1.8 V. The guard circuit will then produce a DC voltage at pin 7, which can be used to blank the picture tube and thus prevent screen damage.

Voltage stabilizer

The internal voltage stabilizer provides a stabilized supply of 6 V to drive the output stage, which prevents the drive current of the output stage being affected by supply voltage variations.

March 1991

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