TDA8350Q Datasheet, PDF(4/16 Page) NXP Semiconductors – DC-coupled vertical deflection and East-West output circuit

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TDA8350Q Datasheet, PDF (4/16 Pages) NXP Semiconductors – DC-coupled vertical deflection and East-West output circuit

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Philips Semiconductors

DC-coupled vertical deï¬ection and

East-West output circuit

PINNING

SYMBOL

Idrive(pos)

Idrive(neg)

VI(fb)

VO(B)

n.c.

GND

VFB

VO(A)

VO(guard)

VO(sink)

II(corr)

II(set)

DESCRIPTION

1 input power-stage (positive);

includes II(sb) signal bias

2 input power-stage (negative);

includes II(sb) signal bias

3 feedback voltage input

4 supply voltage

5 output voltage B

6 not connected

7 ground

8 ï¬yback supply voltage

9 output voltage A

10 guard output voltage

11 East-West ampliï¬er driver (sink)

output voltage

12 East-West ampliï¬er input

correction current (negative)

13 East-West ampliï¬er set input

current (positive)

dbook, halfpage

I drive(pos) 1

Idrive(neg) 2

VI(fb) 3

VP 4

V O(B) 5

n.c. 6

GND 7 TDA8350

V FB 8

VO(A) 9

VO(guard) 10

VO(sink) 11

I I(corr) 12

I I(set) 13

MBC226-1

Fig.2 Pin configuration.

Preliminary speciï¬cation

TDA8350Q

FUNCTIONAL DESCRIPTION

The vertical driver circuit is a bridge configuration. The

deflection coil is connected between the output amplifiers,

which are driven in phase opposition. An external resistor

(RM) connected in series with the deflection coil provides

internal feed back information. The differential input circuit

is voltage driven. The input circuit has been adapted to

enable it to be used with the TDA9150, TDA9151B,

TDA9160A, TDA9162, TDA8366 and TDA8367 which

deliver symmetrical current signals. An external resistor

(RCON) connected between the differential input

determines the output current through the deflection coil.

The relationship between the differential input current and

the output current is defined by: Idiff Ã RCON = I(coil) Ã RM.

The output current is adjustable from 0.5 A (p-p) to 3 A

(p-p) by varying RM. The maximum input differential

voltage is 1.8 V. In the application it is recommended that

Vdiff = 1.5 V (typ). This is recommended because of the

spread of input current and the spread in the value of

RCON.

The flyback voltage is determined by an additional supply

voltage VFB. The principle of operating with two supply

voltages (class G) makes it possible to fix the supply

voltage VP optimum for the scan voltage and the second

supply voltage VFB optimum for the flyback voltage. Using

this method, very high efficiency is achieved.

The supply voltage VFB is almost totally available as

flyback voltage across the coil, this being possible due to

the absence of a decoupling capacitor (not necessary, due

to the bridge configuration). The output circuit is fully

protected against the following:

â¢ thermal protection

â¢ short-circuit protection of the output pins (pins 5 and 9)

â¢ short-circuit of the output pins to VP.

A guard circuit VO(guard) is provided. The guard circuit is

activated at the following conditions:

â¢ during flyback

â¢ during various short-circuit possibilities at the output

pins

â¢ during open loop

â¢ when the thermal protection is activated.

This signal can be used for blanking the picture tube

screen.

An East-West amplifier is also provided. This amplifier is

an inverting amplifier which is current driven with sink

current only capabilities.

January 1995

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