In applications where it is necessary to amplify signals containing DC components, the BUL128A integrated op amp must be fading, ie, the offset of the op amp itself (mainly the differential input stage) is compensated to ensure that the output is O when the op amp is closed. Also O. Some op amps have led to the compensation end, just follow the device manual to access the zero adjustment circuit, such as the LM318, LM741 zero adjustment circuit shown in Figure 5.3.5 (a), (b). Zero adjustment must be careful, do not touch the sliding end of the potentiometer with the ground wire or power line, otherwise it will damage the op amp. For op amps that do not have a zero-regulated termination, the inverting and amplifier nulling circuit can be zeroed with reference to the zeroing circuit shown in Figure 5.3.5(c) and Figure 5.3.5(d), respectively. When zeroing, ground the input end of the circuit, and use the DC current block of the multimeter or the DC coupling of the oscilloscope to connect to the output of the circuit to adjust the potentiometer so that the output is 0. It should be pointed out here that the newly designed op amp has good symmetry, small offset, no zero adjustment, and deep negative feedback can suppress the drift of the zero point by deep negative feedback, and the imbalance can hardly be seen. When it is too high, you can not adjust to zero. There are also some op amps (such as chopper auto-zero op amps) that do not need to be zeroed. When the integrated operational amplifier is used in applications where only AC signals need to be amplified, in order to simplify the power supply circuit, the op amp can be powered by a single power supply (positive or negative power supply). In this case, a single-supply op amp (such as LM324) can be used. Dual-supply op amp single-supply applications can be used. At this point, it must be noted that the static potentials of the two inputs of the integrated amplifier are equal when static, and the input and output of the op amp should be biased in order to make the center of the linear region of the op amp at the static operating point to obtain the maximum dynamic range. At half the value of the power supply.
IGBT Module
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IGBT CHIP(Trench+ Field Stop technology)
VCE(sat) with positive temperature coefficient
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Free wheeling diodes with fast and soft reverse recovery
Temperature sense included