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AMS5105 数据表(PDF) 6 Page - Advanced Monolithic Systems |
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AMS5105 数据表(HTML) 6 Page - Advanced Monolithic Systems |
6 / 8 page Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS5105 APPLICATION NOTES Definition of Terms Dropout Voltage: The input-output voltage differential at which the circuit stops to regulate against further reduction in input voltage. Measured when the output voltage has dropped 100mV from the nominal voltage obtained at 1V input, dropout voltage is dependent upon load current and junction temperature. Input Voltage: The DC voltage applied to the input terminal with respect to ground. Input-Output Differential: The voltage difference between the unregulated input voltage and the regulated output voltage for which the regulator will regulate. Line Regulation: The change in output voltage for a change in the input voltage. The line regulation is measured under conditions of low dissipation or by using low duty cycle pulse testing such that the average chip temperature is not significantly affected. Load Regulation: The change in output voltage for a change in load current at constant chip temperature. Long term stability: Output voltage stability under accelerated life-test conditions after 1000 hours with maximum rated voltage and junction temperature. Quiescent Current: That part of the positive input current that does not contribute to the positive load current. The regulator ground lead current. Temperature Stability of VO: The percentage change in output voltage for a thermal variation from room temperature to either temperature extreme. External capacitor The AMS5105 series requires an output capacitor of 2.2 µF or greater to ensure device stability, as shown in Figures 1 through 4. Without the capacitor the device may oscillate. Most types of tantalum or electrolytic capacitor can be used in the applications. The value of this capacitor can be increased without limits. For higher loads, the value of the capacitor should be increased, especially when the output voltage is set for 2.5V or less. The AMS5105 lowest fixed output voltage value is 1.5V. Programming the Output Voltage The AMS5105 may be programmed for any output voltage between its 1.25V reference and its 6V maximum rating, allowing for dropout and power dissipation. As shown in Figure 3, an external pair of resistors is required. The equation for the output voltage is: VOUT = VREF ⋅ (1 + R1/ R2) where VREF is the nominal 1.25 reference voltage. Typical application circuit (adjustable output) TYPICAL APPLICATION GND ENABLE 2 3 1 5 + 2.2 F + C IN +V IN V OUT AMS5105-X 2.2 F C OUT +V IN V OUT Figure 2 GND V OUT 2 3 1 +V IN +V IN V OUT AMS5105-X + 2.2 F + C IN 2.2 F C OUT Figure 1 R 1 GND FB V OUT V REF R 2 ENABLE 4 2 3 1 5 +V IN + AMS5105 2.2 F + C IN 2.2 F C OUT +V IN V OUT 1.25V Figure 3 |
类似零件编号 - AMS5105 |
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类似说明 - AMS5105 |
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