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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TL7700CPW Fiches technique(PDF) 10 Page - Texas Instruments |
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TL7700CPW Fiches technique(HTML) 10 Page - Texas Instruments |
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10 / 22 page  VCC Vs GND CT RESET RL R1 R2 Ct VCC RESET GND SENSE TL7700 SLVS220F – JULY 1999 – REVISED AUGUST 2011 www.ti.com DETAILED DESCRIPTION Sense-Voltage Setting The SENSE terminal input voltage, Vs, of the TL7700 typically is 500 mV. By using two external resistors, the circuit designer can obtain any sense voltage over 500 mV. In Figure 19, the sensing voltage, Vs ', is calculated as: Vs' = Vs × (R1 + R2)/R2 Where: Vs = 500 mV typ at TA = 25°C At room temperature, Vs has a variation of 500 mV ± 5 mV. In the basic circuit shown in Figure 19, variations of [ ±5 ± (R1 + R2)/R2] mV are superimposed on Vs. Figure 19. Sense-Voltage Hysteresis Setting If the sense voltage (Vs') does not have hysteresis in it, and the voltage on the sensing line contains ripples, the resetting of TL7700 is unstable. Hysteresis is added to the sense voltage to prevent such problems. As shown in Figure 20, the hysteresis (Vhys) is added, and the value is determined as: Vhys = Is × R1 Where: Is = 2.5 μA typ at TA = 25°C At room temperature, Is has variations of 2.5 mA ± 0.5 mA. Therefore, in the circuit shown in Figure 19, Vhys has variations of ( ±0.5 × R1) mV. In circuit design, it is necessary to consider the voltage-dividing resistor tolerance and temperature coefficient in addition to variations in Vs and Vhys. 10 Copyright © 1999–2011, Texas Instruments Incorporated |
Numéro de pièce similaire - TL7700CPW |
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Description similaire - TL7700CPW |
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