TDA2579B datasheet(13/21 Pages) PHILIPS

13 / 21 page

September 1990

Philips Semiconductors

Preliminary speciﬁcation

Horizontal/vertical synchronization circuit

TDA2579B

Second control loop (pin 14)

(horizontal ﬂyback to horizontal

oscillator)

Control sensitivity

td =10 µs

∆ td / ∆ to 200

300

600

µs

Control range

−>45

µs

Control range for constant duty

factor horizontal output

29 (

−t ﬂyback

pulse)

µs

Controlled edge of horizontal

output signal (pin 11)

positive

Phase adjustment (pin 14)

(via second control loop)

Control sensitivity

td =10 µs

−

−µA/µs

Maximum allowed control current

I14

−−± 60

µA

Horizontal oscillator (pin 15)

C = 2.7 nF;

Rosc = 34.8 kΩ

Frequency (no sync)

−

15625

−

Spread (ﬁxed external component,

no sync)

∆ f

−−± 4%

Frequency deviation between

starting point output signal

and stabilized condition

∆ f

−+ 5

+ 8%

Temperature coefﬁcient

−−1.10-4

−

Horizontal output (pin 11)

(Open collector)

Output voltage high

V11

−−

13.2

Start voltage protection

(internal zener diode)

V11

−

15.8

Low input current (pin 16)

protection output enabled

I16

−

5.0

6.2

Output voltage low start condition

I11 =10mA

V11

−

0.1

0.5

Duty factor output current

during starting

I16 = 6.2 mA

Output voltage low normal

condition

I11 =25mA

V11

−

0.3

0.5

Duty factor output current

without flyback pulse (pin 12)

Duration of the output pulse HIGH

td =10 µs

272931

µs

Controlled edge

positive

PARAMETER

CONDITIONS

SYMBOL

MIN.

TYP.

MAX.

UNIT

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