® CA3224E DUCT E NT E PRO T E L O LACEM P E Sheet OBS DataD R ED MEN ECOM October 2002 FN1553.
2 NO R Automatic Picture Tube Bias Control Circuit Description The CA3224E is an automatic picture tube bias control circuit used in color TV receiver CRT drive circuits.
It is used to provide dynamic bias control of the grey scale both initially and over the CRT operating life, compensating for CRT cutoff changes.
The CA3224E provides automatic continuous control of the cutoff current in each gun of a three-gun color CRT.
From an input pulse amplitude proportional to the difference between the desired and the actual CRT cutoff, a gated sample/hold circuit generates a DC correction voltage whic...

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