26/38
TO-247-4L Half-Bridge Evaluation Board
User’s Guide
©
2019 ROHM Co., Ltd.
No. 61UG047E Rev.001
August.2019
Usually, double-pulse signal is a single-shot, please insure adequate inductor current IDP reset time between pulses if a periodic
pulse is applied. As the reset voltage is equal to freewheeling diode forward voltage VF, the reset time can be calculated using the
equation below:
Trst = IDP*L/Vf [us]
Secure the reset time Trst to have around 2 times longer than the calculated value. Even though a heatsink is not necessary
during the double-pulse test, please pay attention as the freewheeling diode temperature may increase when performing the test
repeatedly.
12.2
LS MOSFET Double-pulse Test
The connection of the double-pulse test for LS MOSFET is shown in Figure 25.
Figure 25. LS Double-pulse Test
Connect the LS_ALOW (CN201/9pin) signal to +5Vcc (CN201 8pin) if the pulse generator Single-shot Mode is at Active Low. Set
the OCP point in advance as the OCP circuit is valid.
Input the CLK signal from the pulse generator to IN_L_CLK pin (CN201/4pin), then follow the same procedure as HS.
HS
Gate Driver
HVdc
PGND
Vsw
DUT
DUT
IN_H_CLK
ENABLE
PRIMERY
SECONDERY
BD7F200
Vcc
SNB
HS
Gate Power
PGND
PGND
LS
Gate Driver
Rg
ActiveClamp
LS
Gate Power
Rg
Active Clamp
IN_L_CLK
BM6101
BD7F200
BM6101
+12V
Power
Supply
Pulse
Generator
(+5V output)
Jumper
setting
Dual / DP
Single
JP1
1
3
JP2
SGND
