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AMS3102-25 Fiches technique(PDF) 6 Page - Advanced Monolithic Systems |
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AMS3102-25 Fiches technique(HTML) 6 Page - Advanced Monolithic Systems |
6 / 8 page AMS3102 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. Output Noise Voltage: The rms AC voltage at the output, with constant load and no input ripple, measured over a specified frequency range. Quiescent Current: That part of the positive input current that does not contribute to the positive load current. The regulator ground lead current. Ripple Rejection: The ratio of the peak-to –peak input ripple voltage to the peak-to-peak output ripple voltage at specified frequency. Temperature Stability of VO: The percentage change in output voltage for a thermal variation from room temperature to either temperature extreme. External capacitor The AMS3102 series require an output capacitor of 2.2 µF or greater to ensure device stability. Without the capacitor the device may oscillate. Most type of tantalum or electrolytic capacitor can be used in the applications. A critical characteristic of the capacitors is an ESR value of 5 Ω or less and a resonant frequency above 500kHz. The value of this capacitor can be increased without limits. For higher loads, the value of the capacitor should be increased, specially when the output voltage is set for 2.5V or less. The AMS3102 lowest fixed output voltage value is 2.0V. Typical application circuit (adjustable output) R 2 ADJ + AMS3102 ADJUSTABLE GND C1 22 µF 10µF OUT OFF ON ON/OFF R 1 28k V OUT V IN 100k Minimum Load In circuits using the fixed output voltage versions, minimum load is not required. For circuits using the adjustable device, the value of R1 and R2 should be chosen such, that a current of approximately 40 µA flows through the network. The reference voltage (1.235V) is measured between the adjust pin and VOUT. The output voltage can be set by the two resistors R1 and R2 using the following equation: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + = R1 R2 R1 V V REF O The value of R1 is recommended to be between 25k Ω to 30 kΩ, and the value of R2 will set the output voltage. Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 |
Numéro de pièce similaire - AMS3102-25 |
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Description similaire - AMS3102-25 |
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