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CS8371ET7G データシート(PDF) 8 Page - ON Semiconductor |
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CS8371ET7G データシート(HTML) 8 Page - ON Semiconductor |
8 / 11 page CS8371 http://onsemi.com 8 DEFINITION OF TERMS 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. Current Limit − Peak current that can be delivered to the output. Input Voltage − The DC voltage applied to the input terminals 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 operate. 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. 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 − The 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. Temperature Stability of VOUT − The percentage change in output voltage for a thermal variation from room temperature to either temperature extreme. Figure 23. Applications Circuit VIN GND ENABLE1 VOUT1 VOUT2 Tuner IC Control C1* 0.1 mF 5.0 V 8.0 V * C1 is required if the regulator is far from the power source filter. ENABLE2 APPLICATION NOTES With seperate control of each output channel, the CS8371 is ideal for applications where each load must be switched independently. In an automotive radio, the 8.0 V output drives the displays and tape drive motors while the 5.0 V output supplies the Tuner IC and memory. Stability Considerations/NOCAP Normally a low dropout or quasi−low dropout regulator (or any type requiring a slow lateral PNP in the control loop) necessitates a large external compensation capacitor at the output of the IC. The external capacitor is also used to curtail overshoot, determine startup delay time and load transient response. Traditional LDO regulators typically have low unity gain bandwidth, display overshoot and poor ripple rejection. Compensation is also an issue because the high frequency load capacitor value, ESR (Equivalent Series Resistance) and board layout parasitics all can create oscillations if not properly accounted for. NOCAP is an ON Semiconductor exclusive output stage which internally compensates the LDO regulator over temperature, load and line variations without the need for an expensive external capacitor. It incorporates high gain (>80 dB) and large unity gain bandwidth (>100 kHz) while maintaining many of the characteristics of a single−pole amplifier (large phase margin and no overshoot). NOCAP is ideally suited for slow switching or steady loads. If the load displays large transient current requirements, such as with high frequency microprocessors, an output storage capacitor may be needed. Some large capacitor and small capacitor ESR values at the output may |
同様の部品番号 - CS8371ET7G |
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同様の説明 - CS8371ET7G |
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