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L9444VB Datasheet(PDF) 2 Page - STMicroelectronics |
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L9444VB Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 5 page PIN CONNECTION (top view) ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VS Transient Overvoltage : Load Dump : 5ms ≤ Trise ≤ 10ms, τf Fall Time Constant ≤ 100ms, Rsource ≥ 0.5Ω 80 V Iclamp Current into Low Energy Clamping Zener (Trise =5 µs; Tdecay ≤ 2ms ; duty cycle ≤ 5%) 100 mA Iout Maximum Output Current 5.5 A Tj ,Tstg Junction and Storage Temperature Range – 55 to + 150 °C THERMAL DATA Symbol Parameter Value Unit Rth i-case Thermal Resistance Junction-case Max. 3 °C/W DEVICE OPERATION The alternator voltage, rectified by the auxiliary di- ode trio, is compared with an external reference and the resulting signal switches the output stage, driving the alternator field coil. As the regulator is a self-oscillating type, the switching frequency depends on the whole sys- tem parameter set (including the alternator char- acteristics). The regulator has an integrated filter in the volt- age sensing path. Consequently it doesn’t need - in the standard application- any external compo- nent. Anyway an external capacitor (0.1 - 1 µF) must be inserted between VS and Ground guaranteeing the correct behaviour of the device when the rec- tifying diodes feature very high switching spikes that are not filtered by the devices. This external capacitor must also be used when the impedances of the cables connecting the al- ternator to the battery are so high to cause a su- perimposed ripple on the alternator voltage higher than 3-4V. The devices regulation voltage and the tempera- ture coefficient may be independently set by suited metal mask selections ; furthermore the regulation voltage is trimmed within ± 1% of the nominal value @ 25 °C. The devices have an unique -and patented- sys- tem to compensate the self-heating of the die due to the power dissipated in the output stage. In this way the internal reference voltage tracks the case temperature rather than the die one. The device can withstand the reverse battery and the load dump (up to 80V) ; They can absorb, into the internal clamping zeners, low energy spikes up to a level of 100mA and its output is short cir- cuit protected. Finally the internal thermal shutdown avoids any possible device damage due to overtemperature problems. L9444VB -L9448VB - L9480VB 2/5 |
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