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S1D2512X01-A0B0 Datasheet(PDF) 34 Page - Samsung semiconductor

Part # S1D2512X01-A0B0
Description  DEFLECTION PROCESSOR FOR MULTISYNC MONITORS
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Manufacturer  SAMSUNG [Samsung semiconductor]
Direct Link  http://www.samsung.com/Products/Semiconductor
Logo SAMSUNG - Samsung semiconductor

S1D2512X01-A0B0 Datasheet(HTML) 34 Page - Samsung semiconductor

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S1D2512X01
DEFLECTION PROCESSOR FOR MULTISYNC MONITORS
33
DC/DC CONVERTER PART
This unit controls the switch-mode DC/DC converter. It converts a DC constant voltage into the B+ voltage(roughly
proportional to the horizontal frequency) necessary for the horizontal scanning. This DC/DC converter must be
configured in step-up mode. It operates very similarly to the well known UC3842.
Step-up Mode
Operating description
The power MOS is switched-on at the middle of the horizontal Flyback.
The power MOS is switched-off when its current reaches predetermined value. For this purpose, a sense
resistor is inserted in its source. The voltage on this resistor is sent to pin16 (ISENSE).
The feedback (coming either from the EHV or from the Flyback) is divided to a voltage close to 4.8V and com-
pared to the internal 4.8V reference (IVREF). The difference is amplified by an error amplifier, the output of
which controls the power MOS switch-off current.
Main Features
Switching synchronized on the horizontal frequency
B+ voltage always higher than the DC source
Current limited on a pulse-by-pulse basis
The DC/DC converter is disabled:
- When VCC or VDD are too low,
- When X-Ray protection is latched,
- Directly through I2C bus.
When disabled, BOUT is driven to GND by a 0.5mA current source. This feature allows to implement externally
a soft start circuit.


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