2ED21091S06F View Datasheet(PDF) - Infineon Technologies
Part Name
Description
MFG CO.
'2ED21091S06F' PDF : 26 Pages View PDF
2ED21091S06F
650 V half bridge gate driver with integrated bootstrap diode
Figure 18 Negative voltage tolerance on inputs of upto –5 V
5.11
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 19, here we define the power switches and diodes of the inverter.
If the high-side switch (e.g., the IGBT Q1 in Figure 19Figure 20) 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
parallel with the low-side switch of the same inverter leg. At the same instance, the voltage node VS1, swings from
the positive DC bus voltage to the negative DC bus voltage.
Figure 19 Three phase inverter
Also when the V phase current flows from the inductive load back to the inverter (see Figure 20 C) and D)), and
Q4 IGBT switches on, the current commutation occurs from D3 to Q4. At the same instance, the voltage node, VS2,
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
it swings below the level of the negative DC bus. This undershoot voltage is called “negative VS transient”
Datasheet
www.infineon.com/soi
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V 2.22
2020-07-02
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