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MC33761 Datasheet(PDF) 4 Page - ON Semiconductor |
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MC33761 Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 14 page MC33761 http://onsemi.com 4 DEFINITIONS Load Regulation The change in output voltage for a change in output current at a constant chip temperature. Dropout Voltage The input/output differential at which the regulator output no longer maintains regulation against further reductions in input voltage. Measured when the output drops 100 mV below its nominal value (which is measured at 1.0 V differential value). The dropout level is affected by the chip temperature, load current and minimum input supply requirements. Output Noise Voltage This is the integrated value of the output noise over a specified frequency range. Input voltage and output current are kept constant during the measurement. Results are expressed in mVRMS. Maximum Power Dissipation The maximum total dissipation for which the regulator will operate within its specs. Quiescent Current The quiescent current is the current which flows through the ground when the LDO operates without a load on its output: internal IC operation, bias etc. When the LDO becomes loaded, this term is called the Ground current. It is actually the difference between the input current (measured through the LDO input pin) and the output current. Line Regulation The change in output voltage for a change in input voltage. The measurement is made under conditions of low dissipation or by using pulse technique such that the average chip temperature is not significantly affected. One usually distinguishes static line regulation or DC line regulation (a DC step in the input voltage generates a corresponding step in the output voltage) from ripple rejection or audio susceptibility where the input is combined with a frequency generator to sweep from a few hertz up to a defined boundary while the output amplitude is monitored. Thermal Protection Internal thermal shutdown circuitry is provided to protect the integrated circuit in the event that the maximum junction temperature is exceeded. When activated at typically 125 °C, the regulator turns off. This feature is provided to prevent catastrophic failures from accidental overheating. Maximum Package Power Dissipation The maximum power package power dissipation is the power dissipation level at which the junction temperature reaches its maximum operating value, i.e. 125 °C. Depending on the ambient temperature, it is possible to calculate the maximum power dissipation and thus the maximum available output current. |
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