TDA3653B - Vertical deflection and guard circuit 90°

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.

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