1997 Mar 03

7

Philips Semiconductors

Product specification

Video output amplifier

TDA6106Q

Fig.4 Output voltage (pin 8 falling edge) as a function of AC input signal.

150

140

100

60

50

51

49

s

t

overshoot (in %)

t

t

0

x

x

t f

pd

t

Voc

Vi

MGA975

Flashover protection

The TDA6106Q incorporates a protection diode against

CRT flashover discharges that clamp the cathode output

current, an external 1.5 k

Ω carbon high-voltage resistor in

series with the cathode output and a 2 kV spark gap are

needed (for this resistor-value, the CRT has to be

connected to the main PCB). This addition produces an

increase in the rise and fall times of approximately 7.5 ns

and a decrease in the overshoot of approximately 1.3%.

1. With a capacitor larger than 20 nF with good HF

behaviour (e.g. foil). This capacitor must be placed as

close as possible to pins 6 and 4, but definitely within

5 mm.

2. With a capacitor larger than10

µF on the picture tube

base print (shared by three output stages).

Switch-off behaviour

The output pins of the TDA6106Q are still under the control

of the input pin for a supply voltage down to approximately

30 V.