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MC33375ST-3.0T3G Datasheet(PDF) 4 Page - ON Semiconductor |
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MC33375ST-3.0T3G Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 13 page MC33375, NCV33375 Series http://onsemi.com 4 DEFINITIONS Load Regulation − The change in output voltage for a change in load current at 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), dropout voltage is affected by junction temperature, load current and minimum input supply requirements. Output Noise Voltage − The RMS AC voltage at the output with a constant load and no input ripple, measured over a specified frequency range. Maximum Power Dissipation − The maximum total dissipation for which the regulator will operate within specifications. Quiescent Current − Current which is used to operate the regulator chip and is not delivered to the load. 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. Maximum Package Power Dissipation − The maximum package power dissipation is the power dissipation level at which the junction temperature reaches its maximum value i.e. 150 °C. The junction temperature is rising while the difference between the input power (VCC X ICC) and the output power (Vout X Iout) is increasing. Depending on ambient temperature, it is possible to calculate the maximum power dissipation and so the maximum current as following: Pd + TJ –TA RqJA The maximum operating junction temperature TJ is specified at 150 °C, if TA = 25°C, then PD can be found. By neglecting the quiescent current, the maximum power dissipation can be expressed as: Iout + PD VCC –Vout The thermal resistance of the whole circuit can be evaluated by deliberately activating the thermal shutdown of the circuit (by increasing the output current or raising the input voltage for example). Then you can calculate the power dissipation by subtracting the output power from the input power. All variables are then well known: power dissipation, thermal shutdown temperature (150 °C for MC33375) and ambient temperature. RqJA + TJ –TA PD |
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