TDA1675A PDF

TDAA Vertical Deflection Circuit. SYNCHRONISATION CIRCUIT ESD PROTECTED PRECISION OSCILLATOR AND RAMP GENERATOR POWER. View from ELEC 1 at Perm State University. TDAA VERTICAL DEFLECTION CIRCUIT SYNCHRONISATION CIRCUIT ESD. Find great deals for TDAA Vertical Deflection Circuit Original SGS. Shop with confidence on eBay!.

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The internal clock opens the loop of the amplifier and lets pin 1 floating so allowing the rising of the flyback. The supply of the tdaa1675a output stage is forced at this pin.

The flyback generator supplies the yoke too. 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. C 0 0 50 A 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. The tda16675a output stage is thermally protected by sensing the junction temperature and then by putting off the current sources of the power stage.

Pin 13 is an open collector output where the blanking pulse is available. EPS 8 spring clip being sufficient. tds1675a

Pin 4 is the inverting input of the amplifier used as integrator. A capacitor must be connected to increase the performances from the noise point of view. VS 1 25 Pin 9 is the output of the current mirror that charges the series of Ca and Cb. At this time the flyback generator starts to supply the power output amplifier output stage by tra1675a diode inside the device.

An external capacitor Cf transfers the jump to pin 2 see pin 2.

This pin is also the input of the buffer stage. EPS 5 10 V1 12 9 12 5 A I9 I14 V1 Figure 1: Peak Output Current 0 0. Power amplifier T his amplifier is a voltage-to-current power converter, the transconductance of which is externally defined by means of a negative current feedback. 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.

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The value shown is indicative only. An external network, Ra and Rb, defines the DClevel across Cy so allowing a correct centering of the output voltage. 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.

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At this pin the non-inverting input reference voltage supplied by the voltage regulator can be measured. The Sync input pulse at the Sync gate lowers the level of the upper threshold and than it controls the period duration. Pin 10 is the output of the buffer stage and it is internally coupled to the inverting input of the power amplifier through R1. Specifications mentioned in this publication are subject to change without notice.

TDA1675A.pdf

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. Pin 1 is the output of the power amplifier and it drives the yoke by a negative slope cur- Pin 2 rent ramply. 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.

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. TBL Dimensions Information furnished is believed to be accurate and reliable.

It is a full performance and very efficient vertical deflection circuit intended for direct drive of the yoke of o colour TV picture tubes. 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.

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Re and the Boucherot cell are used to stabilize the power amplifier. Pin 11 is the non-inverting input. Pin 12 is the inverting input of the amplifier.

If the flyback pulse is absent short cirucit or open cirucit of the yokethe blanking output remains high so allowing the CRT protection. Pin 15 is the output of the flyback generator that, when driven, jumps from low to high condition.

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.

Between the heatsink and the package, it is better to insert a layer of silicon grease, tva1675a optimize the thermal contact; no electrical isolation is needed between the two surfaces. The internal clock turns off the lower power output stage to start the flyback. This tfa1675a supersedes and replaces all information previously supplied.

TDA1675A Vertical Deflection Circuit Original SGS

Later, the increasing flyback current reaches the peak value and then the flyback time is completed: Blanking generator and CRT protection This circuit is a pulse shaper and its output goes high during the blanking period or for CRT protection. A clock pulse is generated.

Pin 14 is the main supply voltage input VS positive. 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. 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.

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.