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TDA4841 Datasheet(PDF) 11 Page - NXP Semiconductors |
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TDA4841 Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 60 page 1999 Oct 25 11 Philips Semiconductors Product specification I2C-bus autosync deflection controller for PC monitors TDA4841PS Via control bit FHMULT two different modes of operation can be chosen for the EW output waveform: 1. Mode 1 Horizontal size is controlled via register HSIZE and causes a DC shift at the EWDRV output. The complete waveform is also multiplied internally by a signal proportional to the line frequency [which is detected via the current at HREF (pin 28)]. This mode is to be used for driving EW diode modulator stages which require a voltage proportional to the line frequency. 2. Mode 2 The EW drive waveform does not track with the line frequency. This mode is to be used for driving EW modulators which require a voltage independent of the line frequency. Output stage for asymmetric correction waveforms [ASCOR (pin 20)] This output is designed as a voltage output for superimposed waveforms of vertical parabola and sawtooth. Via the I2C-bus the registers HPARAL and HPINBAL allow to change amplitude and polarity of both signals. Application hint: The TDA4841PS offers two possibilities to control HPINBAL and HPARAL. 1. Control bit ACD = 1. The two registers now control the horizontal phase by means of internal modulation of the PLL2 horizontal phase control. The ASCOR output (pin 20) can be left unused, but it will always provide an output signal because the ASCOR output stage is not influenced by the control bit ACD. 2. Control bit ACD = 0. The internal modulation via PLL2 is disconnected. In order to obtain the required effect on the screen, pin ASCOR must now be fed to the DC amplifier which controls the DC shift of the horizontal deflection. This option is useful for applications which already use a DC shift transformer. If the tube does not need HPINBAL and HPARAL, then pin ASCOR can be used for other purposes, i.e. for a simple dynamic convergence. Dynamic focus section [FOCUS (pin 32)] This section generates a complete drive signal for dynamic focus applications. The amplitude of the horizontal parabola is internally stabilized, thus it is independent of the horizontal frequency. The amplitude can be adjusted via register HFOCUS. Changing horizontal size may require a correction of HFOCUS. To compensate for the delay in external focus amplifiers a ‘pre-correction’ for the phase of the horizontal parabola has been implemented (see Fig.28). The amount of this pre-correction can be adjusted via register HFOCAD. The amplitude of the vertical parabola is independent of frequency and tracks with all vertical adjustments. The amplitude can be adjusted via register VFOCUS. FOCUS (pin 32) is designed as a voltage output for the superimposed vertical and horizontal parabolas. B+ control function block The B+ control function block of the TDA4841PS consists of an Operational Transconductance Amplifier (OTA), a voltage comparator, a flip-flop and a discharge circuit. This configuration allows easy applications for different B+ control concepts. See also Application Note AN96052: “B+ converter Topologies for Horizontal Deflection and EHT with TDA4855/58”. GENERAL DESCRIPTION The non-inverting input of the OTA is connected internally to a high precision reference voltage. The inverting input is connected to BIN (pin 5). An internal clamping circuit limits the maximum positive output voltage of the OTA. The output itself is connected to BOP (pin 3) and to the inverting input of the voltage comparator. The non-inverting input of the voltage comparator can be accessed via BSENS (pin 4). B+ drive pulses are generated by an internal flip-flop and fed to BDRV (pin 6) via an open-collector output stage. This flip-flop will be set at the rising edge of the signal at HDRV (pin 8). The falling edge of the output signal at BDRV has a defined delay of td(BDRV) to the rising edge of the HDRV pulse. When the voltage at BSENS exceeds the voltage at BOP, the voltage comparator output resets the flip-flop and, therefore, the open-collector stage at BDRV is floating again. |
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