參數(shù)資料
型號(hào)： KB2511B
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： ACB 14C 14#16 PIN RECP BOX
中文描述： 偏轉(zhuǎn)處理器多同步監(jiān)測(cè)儀
文件頁(yè)數(shù)： 34/35頁(yè)
文件大小： 337K
代理商： KB2511B
DEFLECTION PROCESSOR FOR MULTISYNC MONITORS KB2511B
33
with C
OSC
: capacitor connected on pin 22
f: synchronisation frequency.
Vertical Moire
By using the vertical moire, VPOS can be modulated from to frame. This function is intended to cancel the fringes
which appear when line to line interval is very close to the CRT vertical pitch. The amplitude pf the modulation is
controlled by register VMOIRE on sub-off via the control bit D7.
DC/DC CONVERTER PART
This unit controls the switch-mode DC/DC con-verter. 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 can
be configured either in step-up or step-down mode. In both cases it oper-ates very similarly to the well known
UC3842.
Step-up Mode
Operating Description
- The powerMOSisswitched-onduringthe flyback (at the beginning of the positive slope of the horizontal focus
sawtooth).
- The power MOS is switched-off when its current reachesa predeterminedvalue. Forthispurpose, a sense resistor
is inserted in its source. The voltage on this resistor is sent to Pin16 (I
SENSE
).
- The feedback(coming either from the EHV or from the flyback) is divided to a voltage close to 4.8V and com-
pared pared to the internal 4.8V reference(I
VREF
). 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 fre-quency,
- B+ voltage always higher than the DC source, - Current limited on a pulse-by-pulse basis.
Step-down Mode
In step-down mode, the Isense information is not used any more and therefore not sent to the Pin16. This mode is
selected by connecting this Pin16 to a DC voltage higher than 6V (for example V
REF-V
).
Operating Description
- The powerMOSis switched-onas for thestep-up mode.
- The feedbackto the error amplifier is done as for the step-up mode.
- The power MOS is switched-off when the HFOCUSCAP voltage get higher than the error amplifier output voltage
Main Features
- Switching synchronized on the horizontal fre-quency,
- B+ voltage always lower than the DC source,
- No current limitation.
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參數(shù)描述
KB2512 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:DEFLECTION PROCESSOR FOR MULTISYNC MONITORS
KB2514 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:VIDEO AMP MERGED OSD PROCESSOR FOR MONITORS
KB2516 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:TRIPLE 8-BIT ANALOG-TO-DIGITAL CONVERTER
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