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TC1306 Folha de dados(PDF) 5 Page - Microchip Technology |
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TC1306 Folha de dados(HTML) 5 Page - Microchip Technology |
5 / 16 page © 2002 Microchip Technology Inc. DS21527B-page 5 TC1306 4.0 TYPICAL APPLICATIONS 4.1 Input and Output Capacitor The TC1306 is stable with a wide range of capacitor values and types. A capacitor with a minimum value of 1 µFfrom VOUT to Ground is required. The output capacitor should have an effective series resistance (ESR) of 0.1 Ω to 10Ω for a 1µF capacitor and 0.01Ω to 10 Ω for a 10µF capacitor. A 1µF capacitor should be connected from the 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 -20°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. 4.2 Shutdown Mode Applying a logic high to each of the shutdown pins turns on the corresponding output. Each regulator enters shutdown mode when a logic low is applied to the corresponding input. During shutdown mode, output voltage falls to zero, and regulator supply current is reducedto0.5 µA (max). If shutdown mode is not necessary, the pins should be connected to VIN. 4.3 Select Mode™ Operation The Select Mode™ operation is a dual-state input that allows the user to select VOUT2 from two different values. By applying a logic low to the SELECT pin, VOUT2 is set to supply a 2.8V output voltage. A logic high signal at the SELECT pin sets VOUT2 to 3.0V. This output voltage functionality provides high design flexibility and minimizes cost associated with inventory, time-to-market and new device qualifications. 4.4 Turn On Response The turn on response is defined as two separate response categories, Wake Up Time (tWK) and Settling Time (tS). The TC1306 has a fast Wake Up Time (10 µsec typical) when released from shutdown. See Figure 4-1 for the Wake Up Time designated as tWK.The Wake Up Time is defined as the time it takes for the output to rise to 2% of the VOUT value after being released from shutdown. The total turn on response is defined as the Settling Time (tS), see Figure 4-1. Settling Time (inclusive with tWK) is defined as the condition when the output is within 2% of its fully enabled value (40 µsec typical) when released from shutdown. The settling time of the output voltage is dependent on load conditions, output voltage and VOUT (RC response). FIGURE 4-1: WAKE-UP RESPONSE TIME tS tWK 98% 2% SHDN VIL VOUT VIH |
Nº de peça semelhante - TC1306 |
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Descrição semelhante - TC1306 |
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