TDA1675A PDF

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It is a full performance and very efficient vertical deflection circuit intended for direct drive of the yoke of o colour TV picture tubes. TBL A EPS A EPS F 10 8 V1L A Unit mA? F t blank 2. A SYNC. IN t sync. F 15k? F 56k? F k? R11 ? F R2 15k? F RT2 R7 ? F 25V 47?

The value shown is indicative only. RT2 R7 1. F 16V 47? F 10V R5 k? F RT2 R7 1k? The Sync input pulse at the Sync gate lowers the level of the upper threshold and than it controls the period duration. A clock pulse is generated. Pin 4 is the inverting input of the amplifier used as integrator.

The internal clock pulse stops the increasing ramp by a very fast discharge of the capacitor a new voltage ramp is immediately allowed. Pin 7 The resistance between pin 7 and ground defines the current mirror current and than the height of the scanning. Pin 9 is the output of the current mirror that charges the series of Ca and Cb. This pin is also the input of the buffer stage.

Pin 10 is the output of the buffer stage and it is internally coupled to the inverting input of the power amplifier through R1. Power amplifier This amplifier is a voltage-to-current power converter, the transconductance of which is externally defined by means of a negative current feedback.

The output stage of the power amplifier is supplied by the main supply during the trace period, and by the flyback generator circuit during the most of the duration of the flyback time. The internal clock turns off the lower power output stage to start the flyback. The power output stage is thermally protected by sensing the junction temperature and then by putting off the current sources of the power stage. Pin 12 is the inverting input of the amplifier.

An external network, Ra and Rb, defines the DClevel across Cy so allowing a correct centering of the output voltage. The series network Rc and Cc, in conjunction with Ra and Rb, applies at the feedback input I2 a small part of the parabola, available across Cy, and AC feedback voltage, taken across Rf. The external components Rc, Ra and Rd, produce the linearity correction on the output scanning currentIy and their values must be optimized for each type of CRT.

Pin 11 is the non-inverting input. At this pin the non-inverting input reference voltage supplied by the voltage regulator can be measured. A capacitor must be connected to increase the performances from the noise point of view. Pin 1 is the output of the power amplifier and it drives the yoke by a negative slope current ramply. Re and the Boucherot cell are used to stabilize the power amplifier.

The supply of the power output stage is forced at this pin. During the trace time the supply voltage is obtained from the main supply voltage VS by a diode, while during the retrace time this pin is supplied from the flyback generator.

Pin 2 Flyback generator This circuit supplies both the power amplifier output stage and the yoke during the most of the duration of the flyback time retrace. The internal clock opens the loop of the amplifier and lets pin 1 floating so allowing the rising of the flyback.

Crossing the main supply voltage at pin 14, the flyback pulse front end drives the flyback generator in such a way allowing its output to reach and overcome the main supply voltage, starting from a low condition forced during the trace period. An integrated diode stops the rising of this output increase and the voltage jump is transferred by means of capacitor Cf at the supply voltage pin of the power stage pin 2.

When the current across the yoke changes its direction, the output of the flyback generator falls down to the main supply voltage and it is stopped by means of the saturated output darlington at a high level. At this time the flyback generator starts to supply the power output amplifier output stage by a diode inside the device. The flyback generator supplies the yoke too. Later, the increasing flyback current reaches the peak value and then the flyback time is completed: the trace period restarts.

The output of the power amplifier pin 1 falls under the main supply voltage and the output of the flyback generator is driven for a low state so allowing the flyback capacitor Cf to restore the energy lost during the retrace.

Pin 15 is the output of the flyback generator that, when driven, jumps from low to high condition. An external capacitor Cf transfers the jump to pin 2 see pin 2. Blanking generator and CRT protection This circuit is a pulse shaper and its output goes high during the blanking period or for CRT protection. If the flyback pulse is absent short cirucit or open cirucit of the yoke , the blanking output remains high so allowing the CRT protection.

Pin 13 is an open collector output where the blanking pulse is available. Voltage regulator The main supply voltage VS, is lowered and regulated internally to allow the required reference voltages for all the above described blocks.

Pin 14 is the main supply voltage input VS positive. IMG A Ambient Temperature 1. EPS R? Between the heatsink and the package, it is better to insert a layer of silicon grease, to optimize the thermal contact; no electrical isolation is needed between the two surfaces.

Millimeters Typ. Inches Typ. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use.

Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. Rights to use these components in a I2C system, is granted provided that the system conforms to the I2C Standard Specifications as defined by Philips.

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