ABB NTCL01 Communication Link Termination Unit

ABB NTCL01 Communication Link Termination Unit

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The maximum permissible diode forward current rating can be calculated with equation (12). To give a current rating of a module, the corresponding junction and case temperature have to be specified, for example in Figure 30. Please note that current ratings without defined temperature conditions have no technical meaning at all. 

Since IF is not known in equation (12), VF @ IF is also not known, but can be found within a few iterations. The ratings of continuous collector current are calculated with maximum values for VF to ensure the specified current rating, taking component tolerances into account. 

Figure 30 depicts the typical forward characteristic of the implemented diode at different junction temperatures. A negative temperature coefficient of the diode’s forward voltage drop can be observed, which is typical for minority-carrier devices. Therefore, the conduction losses of the diode decrease with increasing temperatures. 

ABB NTCL01 Technical drawing:

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