DEFLECTION PROCESSOR FOR MULTISYNC MONITORS

S1D2512X01

28

Output Section

adjustable). In order to secure scanning power part operation, the output is inhibited in the following circumstances:

•

•

XRAY protection activated

•

During horizontal Flyback

•

The output stage is composed of a NPN bipolar transistor. Only the collector is accessible (see Figure 10).

The output stage is intended for reverse base control, where setting the output NPN in off-state will control the

power scanning transistor in off-state.

It is evident that the power scanning transistor cannot be directly driven by the integrated circuit. An interface has

to be designed between the circuit and the power transistor which can be of bipolar or MOS type.

X-RAY Protection

The activation of the X-ray protection is obtained by application of a high level on the X-ray input (8V on pin 25). It

inhibits the H-drive and B+ outputs.

Vertical Dynamic Focus

The S1D2512X01 delivers a vertical parabola wave from on pin 10. Vertical dynamic focus is tracked with VPOS

and VAMP. Its amplitude can be adjusted. It is also affected by S and C corrections. This positive signal once

amplified has to be connected to the CRT focusing grids.

Figure 10. Output Section

26 H-DRIVE