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TO-247N(-4L) Half-Bridge Evaluation Board
User’s Guide
© 2022 ROHM Co., Ltd.
No. 63UG0
60E
Rev.001
2022.2
In the default setting, the turn-on and turn-off adjustment resistors have the same circuit configuration and are adjusted by
R55. However, if you want to set individual switching speeds for turn-on and turn-off, mount R56 and transmit the drive signal to
the MOSFET through resistor R55 for turn-on, and through D52 and R56 for turn-off. In this case, the gate resistor R55 is used
for turn-on, and R55 // R56 are connected in parallel for turn-off, resulting in faster turn-off.
Note that the footprint of diode D52 is for the anode and cathode, so it can be mounted in reverse. If the anode is connected
to the OUT pin of the driver IC (U2), the turn-on speed can be increased, so it can be used in different ways depending on the
characteristics of the device used.
Figure 7 Gate driver circuit (PCB004P)
6
.
Gate-source voltage measurement using an optical isolation probe
This evaluation board has patterns CX51 and CX151 near the gate terminals at the H-side and L-side DUT, respectively, and
by mounting the connectors, gate-source voltage measurement using an optical isolation probe can be performed. By using an
optically isolated probe, interference from common-mode noise can be removed and more accurate waveforms can be obtained.
(a) Connector mounting pattern
b) Measurement using an optical isolation probe
(c) Probe connections
Figure 8.
Measurement method with Coaxial type shunt resistor
Gate
Resistor
CX51
CX151
