System Design; Schematics; Layout - Infineon EVALFFXMR20KM1HDRTOBO1 Getting Started Manual

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EVAL-FFXMR20KM1HDR
Evaluation board description and getting started guide

System design

3 System design
The EVAL-FFXMR20KM1HDR is a simple driver board for evaluating the switching performance of our 62 mm
module including our new 2kV CoolSiC™ Trench MOSFET technology. All functional blocks are designed to show
a simple circuit approach to accommodate the best performance of our new SiC devices.
3.1

Schematics

The schematics that are shown here are just an excerpt from the entire documentation that can be found in the
PCB design data of the EVAL-FFXMR20KM1HDR board homepage at www.infineon.com.
The linear voltage regulator TLE4284DV in a DPAK package is used to deliver an accurate supply voltage (VDRV),
which is used as supply voltage of the push-pull stage at the isolated DC-DC converter. The widely-known
IR2085s is used as half-bridge driver as shown in Figure 11. This approach can also be used to generate a
galvanic isolation of two independent driver stages, e.g. of a full bridge or a 3-phase topology as shown in the
CoolSiC™ MOSFET motor drives evaluation board for 7.5 kW [2].
Schematics of the power supply of the driver stage
Figure 11
3.2

Layout

The layer stack of the board consists of four layers, including the top, bottom and two internal layers. The top
layer is used for the direct connection of signals of most of the components as shown in Figure 12. The bottom
layer is used to feed in the negative output signals –VISO on the secondary side that is the driver output side of
the board. The internal layers 1 and 2 are used to improve the driver output signals against noise as shown in
Figure 14 and Figure 15. The internal layer 1 is used for the ground signal of the secondary side and to route the
signals of the driver output to the booster stage. The Gerber and ODB++ files can also be accessed via the PCB
design data tab of the EVAL-FFXMR20KM1HDR board homepage at www.infineon.com.
User guide 15 of 24 Revision 1.0
2023-03-27