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TDA4950 Folha de dados(PDF) 3 Page - STMicroelectronics |
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TDA4950 Folha de dados(HTML) 3 Page - STMicroelectronics |
3 / 5 page ELECTRICAL CHARACTERISTICS (Tamb = 25 oC, VS = 26 V, Vfr = 0, S1 and S2 in "a" position, refer to test circuit unless otherwise specified) (continued) Symbol Parameter Test Conditions Min. Typ. Max. Unit K1 Parabola Coefficient K1 = V7A − V7B V7A − V7C , see Figure 2 0.28 K2 Parabola Coefficient K2 = V7A − V7C V7A − V7D , see Figure 2 0.71 ∆V7 (*) ∆V7 = V7E – V7F, see Figure 2 – 40 40 mV I8 Current Source S1 → b 100 µA VSATL Saturation Voltage Io = 400 mA Sink S2 → b1 2 V VSATH Saturation Voltage Io = 100 mA Source S2 → cS1 → b 0.8 1.5 V VF Forward Voltage Io = 400 mA S2 → dS1 → b 1.2 1.7 V Ifr Frame Sawtooth Current Vfr = 6.6 VPP 66 µA 7 R7 R6 10k Ω 10k Ω R2 R8 20k Ω a b S1 R3 11k Ω 10k Ω R1 S2 a b c d TDA4950 V S V F V SATH I O V SATL I F -I O I FR V REF V FR 6 5 8 4 3 1 2 Figure 1 : Test CIrcuit -60 0 15 30 36 60 V 7F V 7A V 7B V 7C V 7D V 7E V 7 (V) I FR (µA) Figure 2 : Parabola Characteristics CIRCUIT OPERATION (see the shematic diagram) A differential amplifier OP1 is driven by a vertical frequency sawtooth current of ± 33µA which is produced via an external resistor from the sawtooth voltage. The non-inverting input of this amplifier is connected with a reference voltage corresponding to the DC level of the sawtooth voltage. This DC voltage should be adjustable for the keystone cor- rection. The rectified output current of this amplifier drives the parabola network which provides a para- bolic output current. This output current produces the corresponding voltage due to the voltage drop across the external resistor at pin 7. If the input is overmodulated (> 40 µA) the internal current is limited to 40 µA. This limitation can be used for suppressing the parasitic parabolic current generated during the flyback time of the frame sawtooth. A comparator OP2 is driven by the parabolic cur- rent. The second input of the comparator is con- nected with a horizontal frequency sawtooth voltage the DC level of which can be changed by the external circuitry for the adjustment of the pic- ture width. The horizontal frequency pulse-width modulated output signal drives the final stage. It consists of a class D push-pull output amplifier that drives, via an external inductor, the diode modulator. TDA4950 3/5 |
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