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CS8164YT5 Fiches technique(PDF) 5 Page - ON Semiconductor |
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CS8164YT5 Fiches technique(HTML) 5 Page - ON Semiconductor |
5 / 8 page 5 The CS8164 is equipped with two outputs. The second output is intended for use in systems requiring standby memory circuits. While the high current primary output can be controlled with the ENABLE lead described below, the standby output remains on under all conditions as long as sufficient input voltage is applied to the IC. Thus, mem- ory and other circuits powered by this output remain unaf- fected by positive line transients, thermal shutdown, etc. The standby regulator circuit is designed so that the quies- cent current to the IC is very low (<2mA) when the other regulator output is off. In applications where the standby output is not needed, it may be disabled by connecting a resistor from the standby output to the supply voltage. This eliminates the need for a capacitor on the output to prevent unwanted oscilla- tions. The value of the resistor depends upon the mini- mum input voltage expected for a given system. Since the standby output is shunted with an internal 6.0V Zener, the current through the external resistor should be sufficient Standby Output VIN ENABLE VOUT1 System Condition 60V 3V 2.4V 8V 0V Turn On Load Dump Low VIN Line Noise, Etc. VOUT2 Short Circuit Thermal Shutdown Turn Off 5V 0V 14V 5V 2.0V 0.8V 14V 26V 31V 8V 8V 2.4V 8V 8V 5V 0V VOUT2 Typical Circuit Waveform Dropout Voltage The input-output voltage differential at which the circuit ceases to regulate against further reduction in input volt- age. Measured when the output voltage has dropped 100mV from the nominal value obtained at 14V input, dropout voltage is dependent upon load current and junc- tion temperature. 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 condi- tions 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 con- tribute 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. Temperature Stability of VOUT The percentage change in output voltage for a thermal variation from room temperature to either temperature extreme. Current Limit Peak current that can be delivered to the output. Definition of Terms Circuit Description |
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