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MC78M09CDTG bảng dữ liệu(PDF) 7 Page - ON Semiconductor |
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7 / 16 page MC78M00, MC78M00A Series http://onsemi.com 7 DEFINITIONS 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. Maximum Power Dissipation − The maximum total device dissipation for which the regulator will operate within specifications. Input Bias Current − That part of the input current that is not delivered to the load. Output Noise Voltage − The rms AC voltage at the output, with constant load and no input ripple, measured over a specified frequency range. Long Term Stability − Output voltage stability under accelerated life test conditions with the maximum rated voltage listed in the devices’ electrical characteristics and maximum power dissipation. Figure 2. DPAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length Figure 3. Worst Case Power Dissipation versus Ambient Temperature (TO−220) qJC = 5°C/W PD(max) = 7.52 W No Heat Sink qHS = 20°C/W qHS = 10°C/W Infinite Heat Sink L, LENGTH OF COPPER (mm) RqJA 10 5.0 3.0 2.0 1.0 0.5 0.3 0.2 0.1 40 50 60 70 80 90 100 TA, AMBIENT TEMPERATURE (°C) 25 50 75 100 125 150 0 102030 25 15 5.0 L L Free Air Mounted Vertically 2.0 oz. Copper PD(max) for TA = 50°C 0 0.4 0.8 1.2 1.6 2.0 2.4 Minimum Size Pad |
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