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MC7905BD2T bảng dữ liệu(PDF) 10 Page - ON Semiconductor |
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10 / 16 page MC7900 Series http://onsemi.com 10 Protection Diodes When external capacitors are used with MC7900 series regulator it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator or from output polarity reversals . Generally, no protection diode is required for values of output capacitance less then 10 mF. Figure 11 shows the MC7915 with the recommended protection diodes. • Opposite Polarity Protection Diode D1 protects the regulator from output polarity reversals during startup, power off and short-circuit operation. • Reverse-bias Protection Diode D2 prevents output capacitor from discharging thru the MC7915 during an input short circuit or fast switch off of power supply. Figure 11. Protection Diodes Gnd Gnd + -20 V Input -15 V Output MC7915 + 1.0 mF 1.0 mF MBRS140 or Equiv D1 MBRS140 or Equiv D2 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 12. D2PAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length PD(max) for TA = +50°C 30 40 50 60 70 80 010 20 30 25 15 5.0 L, LENGTH OF COPPER (mm) Minimum Size Pad 2.0 oz. Copper L L Free Air Mounted Vertically RqJA 1.0 1.5 2.0 2.5 3.0 3.5 |
Số phần tương tự - MC7905BD2T |
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Mô tả tương tự - MC7905BD2T |
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