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CS8481YDP5 データシート(PDF) 4 Page - ON Semiconductor |
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CS8481YDP5 データシート(HTML) 4 Page - ON Semiconductor |
4 / 6 page CS8481 http://onsemi.com 4 DEFINITION OF TERMS Current Limit − Peak current that can be delivered to the output. Dropout Voltage − The input−output voltage differential at which the circuit ceases to regulate against further reduction in input voltage. Measured when the output voltage has dropped 100 mV from the nominal value obtained at 14 V input, dropout voltage is dependent upon load current and junction temperature. Input Output Differential − The voltage difference between the unregulated input voltage and the regulated output voltage for which the regulator will operate. Input Voltage − The DC voltage applied to the input terminals with respect to ground. Line Regulation − The change in output voltage for a change in the input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques 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 − The part of the positive input current that does not contribute to the positive load current, i.e., 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. Short Circuit Current Limit − Peak current that can be delivered by the outPut when forced to 0 V. Temperature Stability of VOUT − The percentage change in output voltage for a thermal variation from room temperature to either temperature extreme. 14 V 0 V 5.0 V 2.0 V 0.8 V VIN ENABLE VOUT1 VOUT2 System Condition Load Dump Low VIN Line Noise, Etc. VOUT1 Short Circuit Thermal Shutdown Turn Off Turn On VOUT2 Short Circuit 3.3 V 3.3 V 3.3 V 3.3 V 3.3 V 3.3 V 5.0 V 5.0 V 5.0 V 5.0 V 5.0 V 5.0 V 2.4 V 2.4 V 0 V 0 V 0 V 0 V 3.0 V 74 V 34 V 30 V 14 V Figure 2. Typical Circuit Waveform APPLICATION NOTES General The CS8481 is a Micropower dual regulator. All bias required to operate the internal circuitry is derived from the standby output, VOUT2. If this output experiences an over current situation and collapses, then VOUT1 will also collapse (see Figure 2). If there is critical circuitry that must remain active under most conditions it should be connected to VOUT2. Any circuitry that is likely to be subjected to a short circuit, e.g., circuitry outside the module, should be connected to VOUT1. External Capacitors Output capacitors are required for stability with the CS8481. Without them, the regulator outputs will oscillate. Actual size and type may vary depending upon the application load and temperature range. Capacitor effective series resistance (ESR) is also a factor in the IC stability. Worst−case is determined at the minimum ambient temperature and maximum load expected. Output capacitors can be increased in size to any desired value above the minimum. One possible purpose of this would be to maintain the output voltages during brief conditions of negative input transients that might be characteristic of a particular system. Capacitors must also be rated at all ambient temperatures expected in the system. To maintain regulator stability down to −40 °C, capacitors rated at that temperature must be used. More information on capacitor selection for SMART REGULATOR ®s is available in the SMART REGULATOR application note, “Compensation for Linear Regulators,” document number SR003AN/D, available through the Literature Distribution Center or via our website at http://www.onsemi.com. |
同様の部品番号 - CS8481YDP5 |
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同様の説明 - CS8481YDP5 |
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