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TLE7209-2R Datasheet(PDF) 7 Page - Infineon Technologies AG |
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TLE7209-2R Datasheet(HTML) 7 Page - Infineon Technologies AG |
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7 / 32 page  TLE 7209-2R Circuit Description Data Sheet 7 Rev. 1.5, 2010-11-05 2.2.2 Temperature-depending Current Reduction For TILR < Tj <TSD the current limit decreases from IL =6.6 A ± 1.1 A to IL =2.5 A ± 1.1 A as shown in Figure 4 Figure 4 Temperature dependent current reduction 2.3 Protection The TLE 7209-2R is protected against short circuits, overload and invalid supply voltage by the following measures: 2.3.1 Short circuit to Ground The high-side switches are protected against a short of the output to ground by an over current shut-down. If a high-side switch is turned on and the current rises above the short circuit detection current IOUK all output transistors are turned off after a typical filter time of 2 μs, and the error bit “Short Circuit to Ground on output 1 (2)”, SCG1 (SCG2) is stored in the internal status register. 2.3.2 Short circuit to VS Due to the chopper current regulation, the low-side switches are already protected against a short to the supply voltage. To be able to distinguish a short circuit from normal current limit operation, the current limitation is deactivated for the blanking time tb after the current has exceeded the current limit threshold IL. If the short circuit detection current IOUK is reached within this blanking time, a short circuit is detected (see Figure 5). All output transistors are turned OFF and the according error bit “Short Circuit to Battery on output 1 (2)”, SCB1 (SCB2) is set. A 6.6A 2.5A Tj °C T SD tolerance of temperature dependent current reduction rangeof over- temperature shut-down I L T ILR |
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