AN3338 datasheet(30/72 Pages) STMICROELECTRONICS

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Electrical characteristics and functions

AN3338

30/72

Doc ID 18441 Rev 4

An example of a short-circuit event is shown in

Figure 18, where it is possible to note the

very fast protection, thanks to the smart shutdown function, against fault events. The main

steps are:

•

t1: collector current IC starts to rise. SC event is not detected yet due to the RC network

on the CIN pin

•

t2: voltage on VCIN reaches the VREF. SC event is detected and the smart shutdown

starts to turn off the SLLIMM.

•

t3: the SLLIMM is definitively turned off in less than 300 ns (including the td(off) time of

IGBT) from SC detection.

Finally, the total disable time is t3-t2 and the total SC action time is t3-t1.

2.3.10

Overtemperature protection

STGIPS10K60A, STGIPL14K60, and STGIPL20K60 are equipped with a negative

temperature coefficient (NTC) thermistor for an easy overtemperature protection, in the

case of slow case temperature drift or just for the temperature measurements, sending this

information to the microcontroller in real-time. Due to the thermal impedance of SLLIMM

and its own time constant, the NTC thermistor is not suited to detect rapid junction

temperature rise of the power devices directly. Therefore, it cannot be used for short-circuit

or overcurrent protection, but only for slow changes in temperature monitoring.

The resistance versus temperature characteristic of NTC thermistor, represented in

Figure 19, is non-linear and is described by the following expression:

Equation 7

Figure 18. Example of SC event













−

⋅

298

25 e

)

(

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