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TEA2031A Fiches technique(PDF) 3 Page - STMicroelectronics |
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TEA2031A Fiches technique(HTML) 3 Page - STMicroelectronics |
3 / 11 page 3/11 TEA2031A the required current via a series resistor to pin 1. Likewise, the current to pin 2 is drawn through a series resistor from an external dc voltage source. These series resistors can have values of around 40k Ω resulting in input currents of approximately 0.1mA ± modulation current. Pin 7 should be loaded to ground through a 100k Ω resistor which as a result will produce a parabola of 5 volts peak-to-peak at pin 7. This parabola is symmetrical if the DC current flowing into pin 2 is equal to the mean input current of pin 1. Other- wise, the parabola becomes dissymmetrical and produces a keystone effect correction. The line saw-tooth at pin 8 is obtained by feeding the line fly-back voltage through an integrator net- work formed by a diode and a grounded capacitor (see typical application diagram). The DC compo- nent of the line saw-tooth is compensated by an in- ternal current sinking source ; so that the mean DC values of line saw-tooth and frame parabola volt- ages are equal. Line saw-tooth and frame parabola signals are ap- plied to a comparator whose output is in the form of width modulated pulses. During every pulse du- ration, the output (pin 5) can sink external coil cur- rents of up to 0.5A associated with diode modulator of the main horizontal scanning circuit. An internal recovery diode feeds back the fly-back energy of the coil to the power supply. This diode can carry currents of up to 0.5A. Table 1. Absolute Maximum Ratings Table 2. Thermal Data (Tamb = + 50°C) Table 3. ELECTRICAL OPERATING CHARACTERISTICS Symbol Parameter Value Unit V6–4 Supply Voltage 35 V I5–4 Output Sink Current 0.5 A I5–6 Diode Output Current 0.5 A I1 and I2 Input Current – 0.5 mA PTOT Power Dissipation 0.8 W TSTG Storage Temperature Range – 20 to 150 °C I5–4 Non Repetitive Peak Current on Output Transistor 1.5 A I5–6 Non Repetitive Peak Current on Output Diode 1.5 A Symbol Parameter Value Unit Rth (j-a) Junction-ambient Thermal Resistance 80 °C/W Symbol Parameter Min. Typ. Max. Unit V6–4 Supply Voltage 16 24 35 V I6 Supply Current (R(3-4) = 22kΩ ; IOUT = 0) 46 mA No Load Consumption (R(3-4) = 22kΩ ; IOUT = 0 ; V(6-4) = 24V) 100 150 mW V3–4 Voltage Reference (R(3-4) = 22kΩ) 5.9 6.3 6.7 V I1mean Frame Saw-tooth Input DC Mean Current R1 = 39k Ω at 2.5V Mean - saw-tooth Voltage 0.1 mA I1PP Frame Saw-tooth Input Peak-to-peak Current R1 = 39k Ω at 2.5V Mean - saw-tooth Voltage 70 µA I2 Keystone Correction Input DC Current If I1 Mean = I2 : No Keystone Effect. R2 = 39kΩ at 2.5V DC ref. 0.1 mA ∆I2 Keystone Correction Input DC Current for Maximum Keystone Effect ± 12.5 µA |
Numéro de pièce similaire - TEA2031A_07 |
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Description similaire - TEA2031A_07 |
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