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TL783 Datasheet(PDF) 8 Page - Texas Instruments |
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TL783 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 13 page TL783 HIGH-VOLTAGE ADJUSTABLE REGULATOR SLVS036E – SEPTEMBER 1981 – REVISED FEBRUARY 2000 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TYPICAL CHARACTERISTICS Figure 13 TJ = 25°C Co = 0 Co = 10 µF 01 2 3 4 Time – µs 0.4 0.2 0 –0.2 1 0.5 0 LINE TRANSIENT RESPONSE Figure 14 VI = 35 V VO = 10 V Co = 1 µF TJ = 25°C 6 4 2 0 –2 –4 –6 0.8 0.6 0.4 0.2 0 0 40 80 120 160 200 240 Time – µs LOAD TRANSIENT RESPONSE DESIGN CONSIDERATIONS The internal reference (see functional block diagram) generates 1.25 V nominal (Vref) between OUT and ADJ. This voltage is developed across R1 and causes a constant current to flow through R1 and the programming resistor R2, giving an output voltage of: VO = Vref (1 + R2/R1) + lI(ADJ) (R2) or VO ≈ Vref (1 + R2/R1) The TL783 was designed to minimize the input current at ADJ and maintain consistency over line and load variations, thereby minimizing the associated (R2) error term. To maintain II(ADJ) at a low level, all quiescent operating current is returned to the output terminal. This quiescent current must be sunk by the external load and is the minimum load current necessary to prevent the output from rising. The recommended R1 value of 82 Ω provides a minimum load current of 15 mA. Larger values can be used when the input-to-output differential voltage is less than 125 V (see the output-current curve in Figure 14) or when the load sinks some portion of the minimum current. |
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