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TLE4678-2 Datasheet(PDF) 9 Page - Infineon Technologies AG |
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TLE4678-2 Datasheet(HTML) 9 Page - Infineon Technologies AG |
9 / 33 page TLE4678-2 Voltage Regulator Data Sheet 9 Rev. 1.0, 2014-03-03 5 Voltage Regulator 5.1 Description 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. Saturation control as a function of the load current prevents any oversaturation of the pass element. 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 chapter Chapter 4.2 have to be maintained. For details see also the typical performance graph “Output Capacitor Series Resistor ESR CQ vs. Output Current IQ”. Also, the output capacitor shall be sized to buffer load transients. An input capacitor C I is not needed for the control loop stability, but recommended to buffer line influences. Connect the capacitors close to the IC terminals. Protection circuitry prevent the IC as well as the application from destruction in case of catastrophic events. These safeguards contain output current limitation, reverse polarity protection as well as thermal shutdown in case of overtemperature. In order 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 thermal 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 behavior of the output voltage until the fault is removed. However, a junction temperature above 150 °C is outside the maximum rating and therefore reduces the IC lifetime. The TLE4678-2 allows a negative supply voltage. However, several 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 condition. Figure 3 Block Diagram Voltage Regulator Circuit Figure 4 Output Voltage vs. Input Voltage C ESR CQ Bandgap Reference GND Q I BlockDiagram_VoltageRegulator.vsd Saturation Control Current Limitation Temperature Shutdown LOAD Supply CI Regulated Output Voltage IQ II VQ VI V t Diagram_Output-InputVoltage.svg V Q,nom V I V dr V Q d V Q d t I load CQ d V Q d t ≈ I Q,max - I load CQ ≈ V I(ext),min |
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