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S1D2512X01-A0B0 Datasheet(PDF) 34 Page - Samsung semiconductor |
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S1D2512X01-A0B0 Datasheet(HTML) 34 Page - Samsung semiconductor |
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34 / 36 page  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. |
Similar Part No. - S1D2512X01-A0B0 |
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Similar Description - S1D2512X01-A0B0 |
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