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TDE1898RDP Folha de dados(PDF) 7 Page - STMicroelectronics |
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TDE1898RDP Folha de dados(HTML) 7 Page - STMicroelectronics |
7 / 12 page (625mA instead of 500mA). - All electrical parameters of the device, con- cerning the calculation, are at maximum val- ues. - Thermal shutdown threshold is at minimum value. - No heat sink nor air circulation (Rth equal to Rthj-amb). Therefore: Vs = 30V, RDSON0 = 0.6 Ω,Iq = 6mA, Ios = 4mA @ Vos = 2.5V, ΘLim = 135°C Rthj-amb = 100 °C/W (Minidip); 90°C/W (SO20); 70 °C/W (SIP9) It follows: Ioutx = 0.625mA, RDSONx = 1.006 Ω,Pq = 180mW, Pos = 110mW From equation 4, we can find: Tambx = 66.7 °C (Minidip); 73.5 °C (SO20); 87.2 °C (SIP9). Therefore, the IPS TDE1897/1898, although guaranteed to operate up to 85 °C ambient tem- perature, if used in the worst conditions, can meet some limitations. SIP9 package, which has the lowest Rthj-amb, can work at maximum operative current over the en- tire ambient temperature range in the worst condi- tions too. For other packages, it is necessary to consider some reductions. With the aid of equation 3, we can draw a derat- ing curve giving the maximum current allowable versus ambient temperature. The diagrams, com- puted using parameter values above given, are depicted in figg. 6 to 8. If an increase of the operating area is needed, heat dissipation must be improved (Rth reduced) e.g. by means of air cooling. + - +IN -IN D1 D2 CONTROL LOGIC Ios LOAD OUTPUT OUTPUT STATUS GND µP POLLING +Vs DC BUS 24V +/-25% D93IN014 Figure 5: Application Circuit. TDE1897R - TDE1898R 7/12 |
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