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TS2950CT33B0 データシート(PDF) 3 Page - Taiwan Semiconductor Company, Ltd |
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TS2950CT33B0 データシート(HTML) 3 Page - Taiwan Semiconductor Company, Ltd |
3 / 9 page TS2950 150mA Ultra Low Dropout Voltage Regulator 3/10 Version: F14 Application Hints External Capacitors For the stability of the TS2950 is requires a 1µF (0.22µF is recommended for 3.0V & 3.3V) or greater capacitor between output and ground. Oscillation could occur without this capacitor. The tantalum or aluminum electrolytic works fine; could use the film type work but are not cost efficient. For the operation of below -25 oC solid tantalum is recommended since the many aluminum type have electrolytes the freeze at about -30 oC. The ESR of about 5Ω or less and resonant frequency above 500KHz are most important parameter in the value of Capacitor. The Capacitors value can be increased without any limit. At lower values of output current, less output capacitance is required for stability. For the currents below 10mA the value of capacitor can be reduce to 0.33µF and 0.1µF for 1mA. The TS2950 is not like other low dropout regulators will remain stable and regulation with no load in addition to the internal voltage divider. This feature very important in application, it is like CMOS RAM keep-alive. If at the input of TS2950 connected to battery or between AC filter capacitor and input is 10 inches wire then 1uF tantalum or aluminum electrolytic capacitor should be connected between input and ground. This could cause more problems when using higher value of external to set the output voltage. To fix this problem increasing output capacitance to 3.3µF. Reducing Output Noise It could be an advantage to reduce the AC noise present at the output. One method is to reduce the regulator bandwidth by increasing the value of the output capacitor. This is the only method that noise could reduce on the TS2950, but is relatively inefficient, as increasing capacitor from 1µF to 220µF only decreases the noise from 430µV to 160µVrms for a 100KHz bandwidth at 5V output. the output capacitor must be increased to 3.3µF to maintain stability. These change the output noise from 430µV/rms for a 100 kHz bandwidth 5V, 3.3V & 3V output. Block Diagram and Typical Applications Circuit |
同様の部品番号 - TS2950CT33B0 |
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同様の説明 - TS2950CT33B0 |
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