Philips tda8351 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA8351

DC-coupled vertical deflection
circuit

Preliminary specification
Supersedes data of June 1992
File under Integrated Circuits, IC02

Philips Semiconductors

January 1995

Philips Semiconductors Preliminary specification

DC-coupled vertical deflection circuit TDA8351

FEATURES

• Few external components

• Highly efficient fully DC-coupled vertical output bridge

circuit

• Vertical flyback switch

GENERAL DESCRIPTION

The TDA8351 is a power circuit for use in 90° and 110°
colour deflection systems for field frequencies of 50 to
120 Hz. The circuit provides a DC driven vertical deflection
output circuit, operating as a highly efficient class G
system.

• Guard circuit

• Protection against:

– short-circuit of the output pins (7 and 4)
– short-circuit of the output pins to V

P

• Temperature (thermal) protection

• High EMC immunity because of common mode inputs

• A guard signal in zoom mode.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

DC supply

V

P

I

q

supply voltage 9 − 25 V
quiescent supply current − 30 − mA

Vertical circuit

I

O(p-p)

output current

−−3A

(peak-to-peak value)

I

diff(p-p)

differential input current

− 600 −µA

(peak-to-peak value)

V

diff(p-p)

differential input voltage

− 1.5 1.8 V

(peak-to-peak value)

Flyback switch

I

M

V

FB

peak output current −−±1.5 A
flyback supply voltage −−50 V

note 1 −−60 V

Thermal data (in accordance with IEC 747-1)

T

stg

T

amb

T

vj

storage temperature −55 − +150 °C
operating ambient temperature −25 − +75 °C
virtual junction temperature −−150 °C

Note

1. A flyback supply voltage of>50 V up to 60 V is allowed in application. A 220 nF capacitor in series with a 22 Ω resistor
(dependent on I

and the inductance of the coil) has to be connected between pin 7 and ground. The decoupling

O

capacitor of VFB has to be connected between pin 6 and pin 3. This supply voltage line must have a resistance of
33 Ω (see application circuit Fig.6).

January 1995 2

Philips Semiconductors Preliminary specification

DC-coupled vertical deflection circuit TDA8351

ORDERING INFORMATION

TYPE NUMBER

TDA8351 SIL9P plastic single-in-line power package; 9 leads SOT131-2

BLOCK DIAGRAM

handbook, full pagewidth

NAME DESCRIPTION VERSION

V

P

36

V

P

TDA8351

I

drive(pos)

I

drive(neg)

1

2

V

V

O(guard)

8

CURRENT

SOURCE

I

S

I

S

I

T

I

T

PACKAGE

V

FB

V

P

V

V

O(A)

P

7

V

O(A)

9

V

I(fb)

5
GND

Fig.1 Block diagram.

January 1995 3

V

O(B)

MBC988- 1

4

V

O(B)

Philips Semiconductors Preliminary specification

DC-coupled vertical deflection circuit TDA8351

PINNING

SYMBOL PIN DESCRIPTION

I

drive(pos)

I

drive(neg)

V

P

V

O(B)

1 input power-stage (positive);

includes I

signal bias

I(sb)

2 input power-stage (negative);

includes I

signal bias

I(sb)

3 operating supply voltage

4 output voltage B
GND 5 ground
V

FB

V

O(A)

V

O(guard)

V

I(fb)

handbook, 2 columns

I

drive(pos)

I

drive(neg)

V

6 input flyback supply voltage

7 output voltage A

8 guard output voltage

9 input feedback voltage

1
2

V

3

P

V

O(B)

4

GND

5

TDA8351

V

6

FB

V

O(guard)

O(A)

V

I(fb)

7
8
9

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 feedback 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 TDA8376 which
deliver symmetrical current signals. An external resistor

) connected between the differential input

(R

CON

determines the output current through the deflection coil.
The relationship between the differential input current and
the output current is defined by: I

diff

× R

CON=Icoil

× 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
V

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

diff

spread of input current and the spread in the value of
R

.

CON

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:

• thermal protection

• short-circuit protection of the output pins (pins 4 and 7)

• short-circuit of the output pins to VP.

Metal block connected to substrate pin 5.
Metal on back.

Fig.2 Pin configuration.

January 1995 4

MBC989

A guard circuit V

is provided. The guard circuit is

O(guard)

activated at the following conditions:

• during flyback

• during short-circuit of the coil and during short-circuit of

the output pins (pins 4 and 7) to VP or ground

• during open loop

• when the thermal protection is activated.

This signal can be used for blanking the picture tube
screen.