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TDE1890 Datasheet(PDF) 8 Page - STMicroelectronics |
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TDE1890 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 12 page - All electrical parameters of the device, con- cerning the calculation, are at maximum val- ues. - Thermal shutdown threshold is at minimum value. Therefore: Vs = 30V, RDSON0 = 0.23 Ω,Iq = 8mA, Ios = 4mA @Vos = 2.5V, ΘLim = 135°C Rthj-amb =35 °C/W It follows: Ioutx = 2.5A, RDSONx = 0.386 Ω,Pq = 240mW, Pos = 110mW From equation 4 we can see that, without any heatsink, it is not possible to operate in the ON steady state at the maximum current value. A derating curve for this case is reported in fig. 7. Using an external heatsink, in order to obtain a to- tal Rth of 15 °C/W, we obtain the derating curve reported in fig. 8. 0 20406080 100 120 0.0 0.5 1.0 1.5 2.0 2.5 D93IN033 Io (A) Tamb (°C) Figure 7: Max. Output Current vs. Ambient Temperature (Multiwatt without heatsink, Rth j-amb =35 °C/W) 0 20 40 60 80 100 120 0.0 0.5 1.0 1.5 2.0 2.5 D93IN020A Io (A) Tamb (°C) Figure 8: Max. Output Current vs. Ambient Temperature (Multiwatt with heatsink, Rth j-amb =15 °C/W) + - +IN -IN D1 D2 CONTROL LOGIC Ios LOAD OUTPUT OUTPUT STATUS GND µP POLLING +Vs DC BUS 24V +/-25% D93IN014 Figure 6: Application Circuit TDE1890 - TDE1891 8/12 |
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