STV9936P datasheet(7/24 Pages) STMICROELECTRONICS

No. de pieza	STV9936P

Descripción Electrónicos	12 ns TRIPLE-CHANNEL HIGH VOLTAGE VIDEO AMPLIFIER

PDF	24 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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STV9553

7/24

THEORY OF OPERATION

6.1

General

The STV9553 is a three-channel video amplifier supplied by a low supply voltage: VCC (typ.12V) and a

high supply voltage: VDD (up to 115V).

The high values of VDD supplying the amplifier output stage allow direct control of the CRT cathodes (DC

coupling mode).

In DC coupling mode, the application schematic is very simple and only a few external components are

needed to drive the cathodes. In particular, there is no need of the DC-restore circuitry which is used in

classical AC coupling applications.

The output voltage range is wide enough (Figure 2) to provide simultaneously :

– Cut-off adjustment (typ. 25V)

– Video contrast (typ. up to 40V),

– Brightness (with the remaining voltage range).

In normal operation, the output video signal must remain inside the linear region whatever the cut-off,

brightness and contrast adjustments are.

Figure 2. Output signal, level adjustments

(A) Top Non-Lin ear Region

VDD

(E) Bottom Non-Linear Region

GND

Blanking pulse

Video Signal

(B) Cut-off Adjust. (25V Typ.)

(D) Contrast Adjust. (40V Typ.)

15V

17V

STV9936P Datasheet(PDF) 7 Page - STMicroelectronics