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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TLE6389 датащи(PDF) 30 Page - Infineon Technologies AG |
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TLE6389 датащи(HTML) 30 Page - Infineon Technologies AG |
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30 / 38 page  TLE 6389 Datasheet Rev. 2.1 30 2007-08-13 Figure 4 Reset timing 7.7 100% duty-cycle operation and dropout The TLE 6389 operates with a duty cycle up to 100%. This feature allows to operate with the lowest possible drop voltage at low battery voltage as it occurs at cold cranking. The MOSFET is turned on continuously when the supply voltage approaches the output voltage level, conventional switching regulators with less than 100% duty cycle would fail in that case. The drop- or dropout voltage is defined as the difference between the input and output voltage levels when the input is low enough to drop the output out of regulation. Dropout depends on the MOSFET drain-to-source on-resistance, the current-sense resistor and the inductor series resistance. It is proportional to the load current: t t V VOUT, RT V FB,RT t rr < t rr t t rd thermal shutdown under voltage over load t rd t rd t rd V IN V VOUT V FB V RO Vdrop ILOAD RDS ON ()PMOS RSENSE RINDUCTANCE ++ () ⋅ = |
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