KB2511B View Datasheet(PDF) - Samsung
Part Name
Description
MFG CO.
'KB2511B' PDF : 35 Pages View PDF
KB2511B
DEFLECTION PROCESSOR FOR MULTISYNC MONITORS
Output Section
The H-drive signal is transmitted to the output through a shaping block ensuring TS and I2C adjustable duty cycle.
In order to secure scanning power part operation, the output is inhibited in the following circumstances:
- Vcc too low
- Xray protection activated
- During horizontal flyback
- H Drive I2C bit control is off.
The output stage is composed of a NPN bipolar transistor. Only the collector is accessible (see figure 14).
26 H-DRIVE
Figure 14.
The output NPN is in off-state when the power scanning transistor is also in off-state.
The maximum output current is 30mA, and the corresponding voltage drop of the output VCEsat is 0.4V typically.
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.
This protection is latched; It may be reset either by Vcc switch off or by I2C(see figure 15).
Horizontal and vertical dynamic focus
The KB2511B delivers and horizontal parabola added on a vertical parabola wavefrom on pin 10. This horizontal
parabola is performed from a sawtooth in phase with flyback pulse middle. This sawtooth is present on pin 9 where
the horizontal focus capacitor is the same as C0 to obtain a controlled amplitude (from 2 to 4.7V typically).
Symmetry (keystone) and amplitude are I2C adjustable (see figure 16). 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 has
to be connected to the CRT focusing grids.
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