TDA4866 데이터 시트보기 (PDF) - Philips Electronics

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TDA4866

Full bridge current driven vertical deflection booster

Philips Electronics 

Philips Semiconductors

Full bridge current driven vertical deflection

booster

Product specification

TDA4866

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 VP) and

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.8). This circuit will

be activated when flyback pulses are missing, which is the

indication of any abnormal operation.

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 60134); voltages referenced to pin 5 (GND); unless

otherwise specified.

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

VP

VFB

IFB

V1, V2

I1, I2

V4, V6

I4, I6

V9

I9

V8

I8

Tstg

Tamb

Tj

Ves

supply voltage (pin 3)

flyback supply voltage (pin 7)

flyback supply current

input voltage

input current

output voltage

output current

feedback voltage

feedback current

guard voltage

guard current

storage temperature

ambient temperature

junction temperature

electrostatic handling voltage

note 1

note 2

note 3

note 4

0

0

0

0

0

0

0

0

0

0

0

−20

−20

−20

−500

30

V

60

V

±1.8

A

VP

V

±5

mA

VP

V

±1.8

A

VP

V

±5

mA

VP + 0.4 V

±5

mA

+150

°C

+75

°C

+150

°C

+500

V

Notes

1. Maximum output currents I4 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.

2001 Aug 07

5

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