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© 2019 ROHM Co., Ltd.
No. 61UG024E Rev.002
Jul. 2021
User’s Guide
BM2P141X-EVK-001
Application Circuit
V
IN
= 90 ~ 264 Vac, V
OUT
= 14 V
Figure 4. BM2P141X-EVK-001 Application Circuit
The BM2P141X is non-insulation method without opto-coupler and feeds back the VCC voltage to 14.0 V typ. This VCC voltage is the
voltage between the VCC pin and the GND_IC pin.
The output voltage VOUT is defined by the following equation.
VOUT = 𝑉
𝐶𝑁𝑇
+ 𝑉
𝐹𝐷2
− 𝑉
𝐹𝐷1
V
CNT
: VCC Control Voltage
V
FD1
: Forward Voltage of diode D1
V
FD2
: Forward Voltage of diode D2
Figure 5. General Buck converter application circuit
Compared to the general Buck converter as shown above, the number of parts is reduced because the feedback circuit is not
required. However, the output voltage may rise at light load because the VCC voltage and the output voltage that are fed back are
different. In that case, please put a resistance on the output terminal and lower the output voltage.
VCC
1
N.C
N.C.
DRAIN
N.C.
GND_IC
N.C.
N.C.
2
3
4
8
7
6
5
GND
VOUT
IC
L
N
AC90-264V
D1
D2
GND
L
N
VCC
5
DRAIN
DRAIN
FB
GND
SOURCE
6
7
4
3
2
1
_
_
VOUT
AC90-264V
