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TC1268 Scheda tecnica(PDF) 5 Page - Microchip Technology |
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TC1268 Scheda tecnica(HTML) 5 Page - Microchip Technology |
5 / 12 page © 2002 Microchip Technology Inc. DS21379B-page 5 TC1268 3.2 Bypass Input A 10nF capacitor connected from the bypass input to ground reduces noise present on the internal reference, which in turn, significantly reduces output noise. If output noise is not a concern, this input may be left unconnected. Larger capacitor values may be used, but this results in a longer time period to achieve the rated output voltage, once power is initially applied. 3.3 Output Capacitor A1 µF (min) capacitor from VOUT to ground is required. The output capacitor should have an effective series resistance greater than 0.1 Ω and less than 5Ω, and a resonant frequency above 1MHz. A 1 µF capacitor should be connected from VIN to GND if there is more than 10 inches of wire between the regulator and the AC filter capacitor, or if a battery is used as the power source. Aluminum electrolytic or tantalum capacitor types can be used. (Since many aluminum electrolytic capacitors freeze at approximately -30°C, solid tantalums are recommended for applications operating below -25°C.) When operating from sources other than batteries, supply noise rejection and transient response can be improved by increasing the value of the input and output capacitors and employing passive filtering techniques. 3.4 ERROR Output ERROR is driven low whenever VOUT falls out of regulation by more than -5% (typical). This condition may be caused by low input voltage, output current limiting, or thermal limiting. The ERROR threshold is 5% below rated VOUT, regardless of the programmed output voltage value (e.g., ERROR =VOL at 2.375V (typ.) for a 2.5V regulator). ERROR output operation is shown in Figure 3-3. Note that ERROR is active when VOUT is at or below VTH, and inactive when VOUT is above VTH + VH. As shown in Figure 3-1, ERROR canbeusedas a battery low flag, or as a processor RESET signal (with the addition of timing capacitor C1). R1 x C1 should be chosen to maintain ERROR below VIH of the processor RESET input for at least 200msec to allow time for the system to stabilize. Pull-up resistor R1 can be tied to VOUT,VIN or any other voltage less than (VIN +0.3V). FIGURE 3-3: ERROR OUTPUT OPERATION VOUT VTH VIH Hysteresis (VH) VOL ERROR |
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Descrizione simile - TC1268 |
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