Datasheet

14 of 24

V 2.21

www.infineon.com/soi

2020-07-07

2ED2181 (4) S06F (J)

650 V high-side and low-side driver with integrated bootstrap diode

Figure 14

Negative voltage tolerance on inputs of upto –5 V

5.9

Negative voltage transient tolerance of VS pin

A common problem in today’s high-power switching converters is the transient response of the switch node’s

voltage as the power switches transition on and off quickly while carrying a large current. A typical 3-phase

inverter circuit is shown in Figure 15, here we define the power switches and diodes of the inverter.

If the high-side switch (e.g., the IGBT Q1 in Figures 15 and 16) switches from on to off, while the U phase current

is flowing to an inductive load, a current commutation occurs from high-side switch (Q1) to the diode (D2) in

the positive DC bus voltage to the negative DC bus voltage.

Figure 15

Three phase inverter

Also when the V phase current flows from the inductive load back to the inverter (see Figures 16 C) and D)), and

swings from the positive DC bus voltage to the negative DC bus voltage.

However, in a real inverter circuit, the VS voltage swing does not stop at the level of the negative DC bus, rather