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Intelligent Power Switches Slide 8

The STMicroelectronics IPS portfolio is split between the automotive group and the industrial group. Between automotive requirements and industrial requirements, there are three parameters that are often met. The first is that current in industrial actuators is often less than 1 A per channel. Some exceptions exist, like the VN751, which is a 2.5 A single channel IPS used a lot in vending machine applications. If several Amps are required, the outputs of an IPS can be connected in parallel increasing the current up to 4 A. By the contrary, automotive requirements are often tens of Amps. The current level is very important to get the right current limit. If the current is too high it could destroy the load driven by the IPS and even burn the die. For instance, when the IPS is characterized to drain safely 1 A, the max current in the event of a short circuit is around 1.5 A. If users take an IPS that can drain 10 A, the current limit will be around 15 A, that is way too high for most industrial applications. Secondly, many IPS can drive only a small inductive load. In the industrial world, STMicroelectronics IPSs are able to drive up to 2 H. This is very important during the fast demagnetization process (in other words, remove the energy of the coil). Finally, to detect an open load, 3 mA is often the target for an industrial application while 100 mA is often sufficient in automotive. The current that can be drained is also connected to the current limit. The short-circuit protection mentioned earlier is, in fact, the max current that can be drained from the component.

PTM Published on: 2011-09-07