전자부품 데이터시트 검색엔진 |
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TS2951 데이터시트(PDF) 5 Page - Taiwan Semiconductor Company, Ltd |
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TS2951 데이터시트(HTML) 5 Page - Taiwan Semiconductor Company, Ltd |
5 / 9 page TS2951 Taiwan Semiconductor Document Number: DS_P0000207 5 Version: G15 BLOCK DIAGRAM APPLICATION INFORMATION External Capacitors For the stability of the TS2951 is requires a 1.0µF (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. More output capacitance needed for the 8-pin version at voltage below 5V since it runs the error amplifier at lower gain. At worst case 3.3≈F or greater must be used for condition of 100mA load at 1.250V output. The TS2951 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. The TS2951 output voltage is set with minimum load of 1µA and external resistors. If at the input ofTS2951 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. Instability can occur if stray capacitor to feedback terminal pin 7 of the TS2951. This could cause more problems when using higher value of external to set the output voltage. To fix this problem the 100pF capacitor between output and feedback and increasing output capacitance to 3.3µF. |
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