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BM2P121XH-Z 데이터시트(HTML) 10 Page - Rohm

부품명 BM2P121XH-Z
상세내용  Non-isolated Type PWM DC/DC Converter IC Built-in Switching MOSFET
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제조사  ROHM [Rohm]
홈페이지  http://www.rohm.com
Logo ROHM - Rohm

BM2P121XH-Z 데이터시트(HTML) 10 Page - Rohm

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10/27
BM2P121XH-Z
TSZ02201-0F1F0A200560-1-2
17.Jan.2019 Rev.001
© 2018 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111
• 15 • 001
6.1
Setting of the Output Voltage VOUT
– continued
This IC enables simpler constitution with a few external parts by fixing the VCC pin voltage. When adjust the
output voltage, adding zener diodes makes it variable. However, it is necessary to consider the dispersion of the
zener diodes.
The variable output voltage is defined by the formula below. The voltage when the MOSFET is off is shown in
Figure 10.
���������������� = ���������������� − ������������1 + ������������2 + ������������1
Where:
������������1 is the forward voltage of diode D1.
������������2 is the forward voltage of diode D2.
������������1 is the zener diode ZD1 voltage.
���������������� is the VCC control voltage.
Figure 10. Back Converter Output Dispersion Circuit (MOSFET = OFF)
6.2
Frequency Circuit
mode 1: Burst Mode
(The intermittent operation starts.)
mode 2: Frequency Modulation Mode
(It reduces the frequency.)
mode 3: Fixed Frequency Mode
(It operates in the maximum frequency.)
mode 4: Overload Mode
(The intermittent operation starts.)
Figure 11. State Transition of Switching Frequency
6.3
Frequency Hopping Function
Frequency hopping function achieves low EMI by change the frequency at random. The upper limit of the
frequency
’s wave width is ±6 % (Typ) for basic frequency.
VCNT - VFD1 + VFD2 + VZD1
ZD1
0 V
-VFD1
VCNT - VFD1
GND
VOUT
AC
Input
Filter
DRAIN
VCC
GND_IC
DRAIN
D1
D2
VCNT - VFD1 + VZD1
Output Power [W]
Switching Frequency
[kHz]
25
65
mode 1
mode 2
mode 3
mode 4
Switching
OFF
[V]


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