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TLE42994GMV33 Datasheet(PDF) 12 Page - Infineon Technologies AG |
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TLE42994GMV33 Datasheet(HTML) 12 Page - Infineon Technologies AG |
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12 / 33 page  Data Sheet 12 Rev. 1.1, 2014-07-03 TLE42994V33 Block Description and Electrical Characteristics 5 Block Description and Electrical Characteristics 5.1 Voltage Regulator The output voltage V Q is controlled by comparing a portion of it to an internal reference and driving a PNP pass transistor accordingly. The control loop stability depends on the output capacitor C Q, the load current, the chip temperature and the poles/zeros introduced by the integrated circuit. To ensure stable operation, the output capacitor’s capacitance and its equivalent series resistor ESR requirements given in the table “Functional Range” on Page 10 have to be maintained. For details see also the typical performance graph “Output Capacitor Series Resistor ESR(CQ) versus Output Current IQ” on Page 15. As the output capacitor also has to buffer load steps it should be sized according to the application’s needs. An input capacitor C I is strongly recommended to compensate line influences. Connect the capacitors close to the component’s terminals. A protection circuitry prevents the IC as well as the application from destruction in case of catastrophic events. These safeguards contain an output current limitation, a reverse polarity protection as well as a thermal shutdown in case of overtemperature. To avoid excessive power dissipation that could never be handled by the pass element and the package, the maximum output current is decreased at input voltages above V I =22V. The overtemperature shutdown circuit prevents the IC from immediate destruction under fault conditions (e.g. output continuously short-circuited) by switching off the power stage. After the chip has cooled down, the regulator restarts. This leads to an oscillatory behaviour of the output voltage until the fault is removed. However, junction temperatures above 150 °C are outside the maximum ratings and therefore significantly reduce the IC’s lifetime. The TLE42994V33 allows a negative supply voltage. In this fault condition, small currents are flowing into the IC, increasing its junction temperature. This has to be considered for the thermal design, respecting that the thermal protection circuit is not operating during reverse polarity conditions. Figure 4 Voltage Regulator Bandgap Reference GND Q I BlockDiagram_VoltageRegulator.vsd Saturation Control Current Limitation Temperature Shutdown CQ ESR C } LOAD Supply C I Regulated Output Voltage I Q I I |
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