1998 Sep 03

4

Philips Semiconductors

Preliminary specification

Full bridge current driven vertical deflection

output circuit in LVDMOS

TDA8354Q

PINNING

SYMBOL

PIN

DESCRIPTION

1

guard output voltage

2

measuring resistor input

3

conversion resistor input

4

supply voltage B

5

output voltage B

GNDB

6

ground B

7

flyback supply voltage

GNDA

8

ground A

9

output voltage A

10

supply voltage A

11

input power-stage (negative);

12

input power-stage (positive);

13

damping resistor compensation

current input

Fig.2 Pin configuration.

The die has been glued to the metal block of the package. If the metal

block is not insulated from the heat sink, the heat sink may only be

connected directly to pins 6 and 8.

handbook, halfpage

TDA8354Q

MGL462

1

2

3

4

5

6

7

8

9

10

11

12

13

Vo(guard)

Vi(M)

Vi(con)

VP(B)

Vo(B)

GNDB

Vflb

GNDA

Vo(A)

VP(A)

Ii(neg)

Ii(pos)

Ii(comp)

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.

The differential input circuit is current driven. The input

circuit is special intended for direct connection to driver

circuits which deliver symmetrical current signals, but is

also suitable for asymmetrical currents. The current to

connected between the output of the input conversion

stage and output stage B. This voltage is compared with

the output current through the deflection coil measured as

information. The relationship between the differential input

current and the output current is defined by:

2

The maximum input current is 800

µA peak for each pin.

The minimum input current should be 50

µA.

Flyback supply

The flyback voltage is determined by an additional supply

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

this method, very high efficiency is achieved. The supply

across the coil, this being possible due to the absence of a

coupling capacitor (not necessary, due to the bridge

configuration). The very short rise and fall time of the

flyback switch is >400 V/

µs.

Protection

The output circuit has protection circuits for:

• Die temperature control

• Overvoltage of output stage A.