User Guide EVAL-1ED020I12F2-DB
22 of 28
v1.0
2021-06-21
EVAL-1ED020I12F2-DB user guide
Isolated driver daughter board to evaluate 1200 V CoolSiC™ MOSFET
Fehler! Verwenden Sie die Registerkarte 'Start', um Heading 1;Heading1 dem Text
zuzuweisen, der hier angezeigt werden soll.
switch off the
output of the driver latching. This means the switch stays off, no matter what happens at
the “IN” input. The driver must be released again by RESET.
Due to the constant current of the internal current source, the charging time of the capacitor can be
calculated using Equation 1 from Figure 14. It should be noted that any capacitance which is in some
way connected to the DESAT pin (protection diodes, capacitances via layout, capacitance of high
voltage diode
V
F
) must also be considered. For example, charges from the drain can also reach the
capacitor
V
C_DESAT
through the capacitance of the diode
V
F
, and thus shorten the charging time.
Figure 14
Equations to describe DESAT behavior
4.1.1
Example measurement 1: switching resistive load
Figure 15 illustrates the first example measurement. The load is a 47 Ω resistor in this case.
Figure 15
Switching resistive load according to figure 7