SKYPER32PROR_0701 Datasheet, PDF (7/18 Pages) Semikron International – IGBT Driver Core

SKYPER™ 32PRO R
Driver Performance
The driver is designed for application with half bridges or single modules and a maximum gate charge per pulse
< 6,3µC. The charge necessary to switch the IGBT is mainly depending on the IGBT’s chip size, the DC-link voltage and the
gate voltage. This correlation is shown in module datasheets. It should, however, be considered that the driver is turned on
at +15V and turned off at -7V. Therefore, the gate voltage will change by 22V during each switching procedure.
Unfortunately, many datasheets do not show negative gate voltages. In order to determine the required charge, the upper
leg of the charge curve may be prolonged to +22V for determination of approximate charge per switch.
The medium output current of the driver is determined by the switching frequency and the gate charge. The maximum
switching frequency may be calculated with the shown equations and is limited by the average current of the driver power
supply and the power dissipation of driver components.
Calculation Switching Frequency
Maximum Switching Frequency @ different Gate Charges @ Tamb=25°C
60 kHz
f_max
=
Iout _{AV max}
Q_GE
50 kHz
40 kHz
fmax:
Maximum switching frequency *
IoutAVmax: Maximum output average current
QGE:
Gate charge of the driven IGBT
*@ Tamb=25°C
30 kHz
20 kHz
10 kHz
0 kHz
0 µC
1 µC
2 µC
3 µC
4 µC
gate charge
5 µC
6 µC
7 µC
Calculation Average Output Current
Average Output Current as a Function of the Ambient Temperature
60 mA
Iout _AV = f_sw × Q_GE
IoutAV:
fsw:
QGE:
Average output current
Switching frequency
Gate charge of the driven IGBT
50 mA
40 mA
30 mA
20 mA
10 mA
0 mA
0 °C
10 °C
20 °C
30 °C 40 °C 50 °C 60 °C
ambient temperature
70 °C
80 °C
90 °C
Please note:
The maximum value of the switching frequency is limited to 50kHz due to switching reasons.
Insulation
Magnetic transformers are used for insulation between gate driver primary and secondary side. The transformer set consists
of pulse transformers which are used bidirectional for turn-on and turn-off signals of the IGBT and the error feedback
between secondary and primary side, and a DC/DC converter. This converter provides a potential separation (galvanic
separation) and power supply for the two secondary (TOP and BOT) sides of the driver. Thus, external transformers for
power supply are not required.
Creepage and Clearance Distance in mm
Primary to secondary
Min. 12,2
7
2007-01-19 – Rev03
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