2ED100E12-F2_EVAL Infineon Technologies, 2ED100E12-F2_EVAL Datasheet - Page 13

• Manufacturer Part Number: 2ED100E12-F2_EVAL
• Description: Power Management IC Development Tools Eval Driver Board EconoDual
• Manufacturer: Infineon Technologies

the collector current slope, is limited. Depending on the stray inductance, the current and the DC voltage the
overvoltage shoot during turn off changes.
Figure 9 shows the parts of the circuit needed for the desaturation function and the active clamping function.
Figure 9
In case of a short circuit the saturation voltage
The IGBT has to be switched off. There will be an overvoltage shoot due to the stray inductance of the
module and the DC-Link. This overvoltage shoot has to be lower than the maximum IGBT blocking voltage.
Therefore the evaluation driver board contains an active clamping function whereby the clamping will raise
the voltage for the booster and also raise the voltage directly on the gate.
The typical turn-off waveform under short circuit condition and room temperature of a FF450R12ME4 module
without any additional function is shown in Figure 10a.Typical waveform under short circuit condition with
active clamp function is shown in 10b at room temperature.
Figure 10
Application Note
a)
Desaturation protection and active clamping diodes
a) Short circuit without active clamp b) with active clamp function
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Driver board for EconoDUAL™3 and EconoPACK™+
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will rise and the driver detects that there is a short circuit.
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b)
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Application Note
V1.2, 2009-08
AN2008-02