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LM2931M-90 데이터시트(PDF) 3 Page - List of Unclassifed Manufacturers |
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LM2931M-90 데이터시트(HTML) 3 Page - List of Unclassifed Manufacturers |
3 / 8 page Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 www.baylinear.com LM2931 Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range. Note 2: Unless otherwise specified all limits guaranteed for TJ = 25 °C, V IN = VO +1V, IL = 100 µA and C L = 1 µF. Additional conditions for the 8- pin versions are feedback tied to –XX Voltage tap and output tied to output Sense pin ( VOUT = XX V) and VSHUTDOWN ≤ 0.8V Note 2: Regulation is measured at constant junction temperature , using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under specification for thermal regulation. Note 3: Line regulation for is tested at 150 °C for I L = 1mA. For IL = 100 µA and T J = 125 °C, line regulation is guaranteed by design to 0.2%. for B2931-15 16V ≤ V IN ≤ 26V. Note 4: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. Note 5: Ground pin Current is the regulator quiescent current. The total current drawn from the source is the sum of the ground pin current and output load current. Note 6: Thermal regulation is the change in output voltage at a time T after a change in power dissipation, excluding load or line regulation effects. Specifications are for a 50 mA load pulse (1.25W) for T = 10ms. Note 7: VREF ≤ V OUT ≤ (V IN –1V), 2.3V ≤ V IN ≤ 26V, 100µA ≤ I L ≤100mA, T J ≤ T JMAX Note 8: VSHUTDOWN ≥ 2V, V IN ≤ 26V, V OUT = 0 Application Hints The LM2931 requires an output capacitor for device stability. The value required varies greatly depending upon the application circuit and other factors. The high frequency characteristics of electrolytic capacitors depend greatly on the type and also on the manufacturer. Sometimes only bench testing is the only means to determine the proper capacitor type and value. The high quality 100 µF aluminum electrolytic covers all general application circuits, this stability can be obtained with a tantalum electrolytic value of 47 µF. Another critical point of electrolytic characteristics is its performance over temperature. The LM2931 is designed to operate starting at -40 °C which may not be true in the case of electrolytic. Higher temperatures generally no problem. The electrolytic. type in aluminum will freeze around -30 °C. This could cause an oscillation at output of regulator. At a lower temperature requirement by many applications the capacitor should maintain its performance. So as a result, for an application which regulator junction temperature does not exceed 25 °C, the output capacitor can be reduced by the factor of two over the value needed for the entire temperature range. Other points with linear regulators are that the twitch higher output current stability decreases. In most applications the LM2931 is operating at few milliamps. In these applications the output capacitance can be further reduced. For example, when the regulator is running at 10mA output current the output capacitance value is half compared to the same regulator that is running at 100 mA. With the LM2931 adjustable regulator, the minimum value of output capacitance is a function of the output voltage. The value decreases with higher output voltages, since the internal loop gain is reduced. The worst case occurs at the lower temperature and maximum operating currents, the entire circuit and the electrolytic, should be cooled down to the minimum temperature. The minimum of 0.6 volts required at the input of regulator above the output to keep the power dissipation and die heating to its minimum. After the value for the capacitor has been determined for actual use, the value should be doubled. |
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