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LM1229 データシート(PDF) 10 Page - Texas Instruments |
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LM1229 データシート(HTML) 10 Page - Texas Instruments |
10 / 28 page OBSOLETE LM1229 SNOSAH0D – MARCH 2005 – REVISED APRIL 2013 www.ti.com APPLICATION INFORMATION PIN CONNECTIONS Pin Pin Name Schematic Description No. 1 CALC CALC is the feedback loop filter which maintains 2 COSC constant vertical ramp amplitude according to the value set in the vertical height register. COSC is the capacitor which determines the slope of the vertical ramp. 3 VDRIVEOUT These two outputs provide the inputs to a vertical 4 VDRIVEREF output amplifier which drives the vertical yoke winding. Since the VDRIVEOUT amplitude is from 1.5V to 2.5V peak to peak, the gain of the output amplifier must be set with external resistors to match the vertical yoke being used. The VDRIVEOUT slope is positive (increasing voltage with time). 5 VREF Caps Provides filtering for the internal voltages which set the 6 internal bias currents in conjunction with REXT. For 7 proper filtering, pins 5, 6 and 7 should be 10 µF, pin 23 23 should be 54 µF and pin 54 should be .01 µF. 54 These capacitors should be placed as close to their pins as possible. 8 VEHT1 This input pin is used to control the height of the vertical ramp based on changes in the high voltage. A 1V negative change at pin 8 causes a maximum of 5% reduction in the ramp amplitude when the VEHT[3:0] is set to 0xF. If this pin is not used, bit 3 of the SYNCPOL register should be set to 1. The values shown give a 350 mV change at pin 8 from a 2.5V change at the ABL pin. 9 VEHT2 This input pin is used to control the level of the E-W parabola based on changes in the high voltage. A 1V negative change at pin 9 causes a maximum of 300 mV increase in the ramp DC level when the VEHT[7:4] is set to 0xF. If this pin is unused, bit 4 of the SYNCPOL register should be set to 1. The values shown give a 350 mV change at pin 9 from a 2.5V change at the ABL pin. 10 EWOUT EWOUT is the output used for control of width, pincushion, trapezoid and top and bottom corners. Its lowest voltage is in the middle of vertical scan. The amplitudes of these functions are register controlled. 10 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: LM1229 |
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同様の説明 - LM1229 |
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