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SP000221229 Datasheet(PDF) 9 Page - Infineon Technologies AG |
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SP000221229 Datasheet(HTML) 9 Page - Infineon Technologies AG |
9 / 17 page 2006-03-09 Page 9 ISP 742 RI Open-load detection OFF-state diagnostic condition: VOUT > 3V typ.; IN=low Vbb disconnect with charged inductive load PROFET V IN ST OUT GND bb V bb high Open load detection Logic unit V OUT Signal GND I L(OL) OFF GND disconnect PROFET V IN ST OUT GND bb V bb V IN VST V GND Inductive Load switch-off energy dissipation PROFET V IN ST OUT GND bb = E E E EAS bb L R ELoad RL L { L Z GND disconnect with GND pull up PROFET V IN ST OUT GND bb V bb V GND V IN V ST Energy stored in load inductance: EL = ½ * L * IL2 While demagnetizing load inductance, the enérgy dissipated in PROFET is EAS = Ebb + EL - ER = VON(CL) * iL(t) dt, with an approximate solution for RL > 0Ω: E IL R VV IR V AS L L bb O U T C L LL OUT C L =+ + * * *( | ) * ln ( * || ) ()| () 2 1 |
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