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L6932D1.8TR Datasheet(PDF) 8 Page - STMicroelectronics |
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L6932D1.8TR Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 10 page L6932 8/10 Figure 10. Thermal Impedance Considering a pulse duration of 1sec, the thermal impedance is close to 20°C/W, allowing much bigger power dissipated. Example: Vin = 3.3V Vout = 1.8V Iout = 2A Pulse Duration = 1sec The power dissipated by the device is: PDISS = (VIN - VOUT) · IOUT = 1.5 · 2 3W Considering a thermal impedance of 20°C/W, the maximum junction temperature will be: TJ = TA + ZTHJA · PDISS = 60 + 60 = 120°C Obviously, with pulse durations longer than approximately 10sec the thermal impedance is very close to the thermal resistance (60°C/W to 70°C/W). |
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