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MTMM-103-10-S-D-395

来源:LM317 Electronics Components编辑:Bellnix Co., LTD.时间:2021-06-14 03:44:10

Halla's contention may well turn out to be true, but semiconductor and related industries like LED manufacturers are now seeking to convert all the talk about green” engineering into another kind of green. With much of the rest of their business going in the tank (National Semiconductor announced job cuts later in the week after Halla's appearance here), chip makers are looking for ways to build a sustainable business model around renewable technologies like power management components and systems as well as energy-harvesting modules.

The currents flowing during charging are almost identical for the PTC ceramic (blue) and the ohmic resistor (red). The time curve of the charging currents is almost identical in the two cases. The slight divergences of the current characteristic of the PTC ceramic from that of the fixed resister are due to the particular shape of the resistance-temperature characteristic of the PTC thermistor; and the voltage dependence of the PTC ceramic that is particularly strong during the turn-on process. This voltage dependence must be taken into account when dimensioning the peak inrush current. After about 190ms, charging is completed and the charging resistors are short-circuited. The energy absorption curves and thus the degree of heating are also almost identical (Figure 5). Their maximum corresponds to the energy in the capacitor at the time of the short circuit.

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Figure 5: Absorption during charging

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The energy absorption of the PTC ceramic (blue) and the ohmic resistor (red) are almost identical during normal charging. The advantage of a PTC thermistor as a current-limiting element becomes evident in the event of malfunctions. If the relay fails to close, the load current flows via the charging resistor and produces a high thermal stress that would require corresponding dimensioning of the resistor. When a charging resistor based on PTC ceramic is used, its resistance rises to several 10 kOhm due to the high initial power dissipation and accordingly limits the current flowing during this malfunction (Figure 6). After about three seconds, the current flowing through the two resistors and thus through the entire circuit has dropped to a few 10mA. A comparison of the energies absorbed is shown in Figure 7.

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Figure 6: Current flow with a defective relay

Pros for the metal programmable approach

Cons for the metal programmable approach

Analog IP design reuse considerations Analog implementations are especially sensitive to use in multiple settings where the performance might be affected based on placement. Some basic approaches can be taken to help in analog block reuse:

IP design guidelines for interoperability, re-configurability

Some considerations must be addressed when reuse is planned. It is important to review the following:

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