Rohm BD7682FJ-EVK-301 User Manual

BD7682FJ-EVK-301 EV BOARD USER GUIDE
High voltage input aux power supply ev. Board
1 – 1700V SiC MOSFET SCT2H12NZ
2 – Quasi-resonant controller BD7F682FJ-LB
Board dimensions 80mm x 80mm
Figure 1 – Top and Bottom views
The AUX board is able to operate with both AC and DC input voltages. It is therefore possible to derive the power directly
from the grid or from the system DC link, e.g. after the PFC stage. In case of AC input, the accepted input voltage range
goes from 210 V to 480 V
AC
mounts screw connections to facilitate the cabling to 3phase input or Vdc input. It is possible to remove the connectors
and use vertical mounting connectors as an example of module board for Aux power supply in a power system.
The simplified schematic of the AUX board is shown in Figure 2.
AC
© 2018 ROHM Co., Ltd.
1
. In case of DC input, the input range goes from 300 V
AC
D
V
CC
+
Diode
V
Filter
DC
Bridge
-
Mask
V
CC
Feedback
Gate
BD7682FJ
ZT
I
sense
Figure 2 – Simplified schematic of the AUX board.
Param. Description
2
V
IN
voltage
V
OUT
voltage
P
OUT
Switching
f
sw
frequency
Table 1- main electrical parameters.
L
aux
aux
ZT
L
L sec
D
prim
sec
Brown
Out
Q1
Gate
Optocoupler
C
OSS
I
sense
Feedback
1/16
User Guide
Value
Input 210...480 V
300...to 900 V
Output
12 V
± 3%
DC
Output 30 W @ V
IN.MIN
power 40 W @ V
IN.MAX
90..120 kHz
to 900 V . This board version "301"
DC DC
+
V
OUT
-
No. 60UG064E Rev.001
AC
DC
19 Feb 2018