Philips tda4866 DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

TDA4866

Full bridge current driven vertical deflection booster

Product speciﬁcation Supersedes data of 1995 Aug 31 File under Integrated Circuits, IC02

1996 Oct 10

Philips Semiconductors Product speciﬁcation

Full bridge current driven vertical

TDA4866

deﬂection booster

FEATURES

• Fully integrated, few external components

• No additional components in combination with the

deflection controller TDA4850/51/55

• Pre-amplifier with differential high CMRR current mode inputs

• Low offsets

• High linear sawtooth signal amplification

• High efficient DC-coupled vertical output bridge circuit

• Powerless vertical shift

• High deflection frequency up to 140 Hz

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

DC supply; note 1

supply voltage (pin 3) 8.2 − 25 V ﬂyback supply voltage (pin 7) note 2 −−60 V quiescent current (pin 7) − 710mA

Vertical circuit

deﬂ

deﬂection current (peak-to-peak value; pins 4 and 6)

differential input current (peak-to-peak value) note 3 −±500 ±600 µA

Flyback generator

maximum current during ﬂyback (peak-to-peak value; pin 7)

• Power supply and flyback supply voltage independent adjustable to optimize power consumption and flyback time

• Excellent transition behaviour during flyback

• Guard circuit for screen protection.

GENERAL DESCRIPTION

The TDA4866 is a power amplifier for use in 90 degree colour vertical deflection systems for frame frequencies of 50 to 140 Hz. The circuit provides a high CMRR current driven differential input. Due to the bridge configuration of the two output stages DC-coupling of the deflection coil is achieved. In conjunction with TDA4850/51/55 the ICs offer an extremely advanced system solution.

0.6 − 2A

−−2A

Guard circuit; note 1 V

guard voltage guard on 7.5 8.5 10 V guard current guard on 5 −−mA

Notes

1. Voltages refer to pin 5 (GND).

2. Up to 60 V ≥ V

≥ 40 V a decoupling capacitor CFB=22µF (between pin 7 and pin 5) and a resistor RFB= 100 Ω

(between pin 7 and VFB) are required (see Fig.4).

3. Differential input current Iid=I1−I2.

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TDA4866 SIL9P plastic single in-line power package; 9 leads SOT131-2

1996 Oct 10 2

Philips Semiconductors Product speciﬁcation

Full bridge current driven vertical deﬂection booster

BLOCK DIAGRAM

handbook, full pagewidth

INA 1

INB 2

from e.g.

TDA4850/51/55

TDA4866

INPUT STAGE

GUARD

output

GUARD

CIRCUIT

PROTECTION

TDA4866

GND V

FLYBACK

GENERATOR

AMPLIFIER A

AMPLIFIER B

753

6 OUTA

FEEDB

4 OUTB

ref

defl

vertical

deflection

coil

PINNING

SYMBOL PIN DESCRIPTION

INA 1 input A INB 2 input B V

3 supply voltage OUTB 4 output B GND 5 ground OUTA 6 output A V

7 ﬂyback supply voltage GUARD 8 guard output FEEDB 9 feedback input

Fig.1 Block diagram.

handbook, halfpage

MED750

INA

1 2

INB

OUTB

4 5

GND

OUTA

GUARD

FEEDB

TDA4866

6 7 8 9

MED751

Fig.2 Pin configuration.

1996 Oct 10 3

Philips Semiconductors Product speciﬁcation

Full bridge current driven vertical deﬂection booster

FUNCTIONAL DESCRIPTION

The TDA4866 consists of a differential input stage, two output stages, a flyback generator, a protection circuit for the output stages and a guard circuit.

Differential input stage

The differential input stage has a high CMRR differential current mode input (pins 1 and 2) that results in a high electro-magnetic immunity and is especially suitable for driver units with differential (e.g. TDA4850/51/55) and single ended current signals. Driver units with voltage outputs are simply applicable as well (e.g. two additional resistors are required).

The differential input stage delivers the driver signals for the output stages.

Output stages

The two output stages are current driven in opposite phase and operate in combination with the deflection coil in a full bridge configuration. Therefore the TDA4866 requires no external coupling capacitor (e.g. 2200 µF) and operates with one supply voltage V flyback supply voltage V through the coil (I

defl

which produces a voltage drop (Urm) of: Urm≈ Rm× I At the feedback input (pin 9) a part of I input stage. The feedback input has a current input characteristic which holds the differential voltage between pin 9 and the output pin 4 on zero. Therefore the feedback current (I

---------R

ref

) through R

×≈

defl

The input stage directly compares the driver currents into pins 1 and 2 with the feedback current I this comparison leads to a more or less driver current for the output stages. The relation between the deflection current and the differential input current (I

idI9

---------R

ref

×≈=

defl

Due to the feedback loop gain (V bondwire resistance (R to determine the accurate value of I

and a separate adjustable

only. The deflection current

) is measured with the resistor R

is fed back to the

defl

is:

ref

. Any difference of

) is:

) and internal

U loop

) correction factors are required

defl

m defl

TDA4866

deflIid

with R

 

for I

≈ 70 mΩ and

–

---------------- V

Uloop

= 0.7 A.

defl

ref

× 1

-----------------------RmRbo+

0.98≈



×=



The deflection current can be adjusted up to ±1 A by varying R

when Rm is fixed to 1 Ω.

ref

High bandwidth and excellent transition behaviour is achieved due to the transimpedance principle this circuit works with.

Flyback generator

During flyback the flyback generator supplies the output stage A with the flyback voltage. This makes it possible to optimize power consumption (supply voltage V flyback time (flyback voltage VFB). Due to the absence of a decoupling capacitor the flyback voltage is fully available.

In parallel with the deflection yoke and the damping resistor (Rp) an additional RC combination (RSP; CSP) is necessary to achieve an optimized flyback behaviour.

Protection

The output stages are protected against:

• thermal overshoot

• short-circuit of the coil (pins 4 and 6).

Guard circuit

The internal guard circuit provides a blanking signal for the CRT. The guard signal is active HIGH:

• at thermal overshoot

• when feedback loop is out of range

• during flyback.

The internal guard circuit will not be activated, if the input signals on pins 1 and 2 delivered from the driver circuit are out of range or at short-circuit of the coil (pins 4 and 6).

For this reason an external guard circuit can be applied to detect failures of the deflection (see Fig.6). This circuit will be activated when flyback pulses are missing, which is the indication of any abnormal operation.

–

---------------- V

Uloop

) and

1996 Oct 10 4

Philips Semiconductors Product speciﬁcation

Full bridge current driven vertical

TDA4866

deﬂection booster

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134); voltages referenced to pin 5 (GND); unless otherwise speciﬁed.

SYMBOL PARAMETER MIN. MAX. UNIT

1,V2

1,I2

4,I6

stg

amb

supply voltage (pin 3) 0 30 V ﬂyback supply voltage (pin 7) 0 60 V ﬂyback supply current 0 ±1.8 A input voltage 0 V

V input current 0 ±5mA output voltage 0 V

V output current (note 1) 0 ±1.8 A feedback voltage 0 V

V feedback current 0 ±5mA guard voltage (note 2) 0 VP+ 0.4 V guard current 0 ±5mA storage temperature −20 +150 °C operating ambient temperature −20 +75 °C junction temperature (note 3) −20 +150 °C electrostatic handling for all pins (note 4) −500 +500 V

Notes

1. Maximum output currents I

and I6 are limited by current protection.

2. For VP> 13 V the guard voltage V8 is limited to 13 V.

3. Internally limited by thermal protection; switching point ≥ 150 °C.

4. Equivalent to discharging a 200 pF capacitor through a 0 Ω series resistor.

THERMAL CHARACTERISTICS

SYMBOL PARAMETER VALUE UNIT

th j-mb

thermal resistance from junction to mounting base 4 K/W

1996 Oct 10 5

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