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TO-247-4L Half-Bridge Evaluation Board
User’s Guide
©
2019 ROHM Co., Ltd.
No. 61UG047E Rev.001
August.2019
7
．
Gate Resistor Adjustment
MOSFET switching speed can be adjusted by using the Gate resistors. In addition, the speed for HS and LS can be set individually.
Turn ON: HS (R70, R71, R72, D51)
LS (R170, R171, R172, D151)
Turn OFF: HS (R73, R74, R75, D52)
LS (R173, R174, R175, D152)
The circuit configuration allows the adjustment of the device characteristics switching speed.
The drive circuit mounting condition is shown in Figure 10, and the circuit diagram is shown in Figure 11.
The MOSFET is driven by ROHM’s MOSFET driver IC (BM6101FV-C) output signal through the Gate resistors. It is better to shorten
the wiring of the driver circuit pattern as it’s inductance affects the surge voltage characteristics of the Gate-Source signal. However,
this evaluation board allows the individual setting of Gate resistors at turn ON and turn OFF to support various driving conditions.
Figure 10. Gate Drive Circuit Mount Condition
When turn ON and turn OFF switching speed of the MOSFET is set individually, the drive signal is sent to the MOSFET through D51
and D151 diodes for turn ON, and through D52 and D152 diodes for turn OFF. Here, R70, R73, R170 and R173 resistors are not
mounted, switching speed is set by R71, R72, R171 and R172 resistors.
HS
LS
HS
LS
LS Gate
Resistor
HS Gate
Resistor
HS Gate
Clamp SBD
LS Gate
Clamp SBD
