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G
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3
2018.
3
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User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.003
2018.3
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Application Circuit
VIN = 90 ~ 264 Vac, VOUT = 15 V
Figure 4. BM2P159T1F-EVK-001Application Circuit
The BM2P159T1F is non-insulation method without opto-coupler and feeds back the VCC voltage to 15.0 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.
ൌ ܸே் ܸ
ிଶ െܸ
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VCNT: VCC Control Voltage
VFD1: Forward Voltage of diode D1
VFD2: 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
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5
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7
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M
2P159T1F
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ND pin
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Oscillation
Operation
T
MOSFET
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Function
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Frequency:
T
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R
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VCC: 10.
6
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CC G
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G
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6
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V
to 650
V
0.85 mA(Ty
p
0.45 mA(Ty
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0
°C ~ +105 °
C
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tc.).
6
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Important Pa
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IN
V
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3
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User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.003
2018.3
%037)(9.
2 Coil Selection - Continued
2.2 Inductor Current Calculation
Calculate the maximum peak current of the inductor. The condition where the peak current is maximized is when the input
voltage is the maximum voltage VIN (Max): 380 V, the maximum load current Io (Max): 0.175 A, and the switching frequency is
106 kHz at the minimum. The peak current IP of the coil is given by the following formula.
ܫൌටʹൈܫைൈ݂
௦௪ሺܯܽݔሻൈܮൈ ಿሺெ௫ሻାಷ
ሺಿሺெ௫ሻାೀሻൈሺೀାಷሻൌ͵ͺ[mA]
Select a coil with an rated current of 0.37 A or more.
In this EVK, we use inductance value: 150 μH, rated: 0.65A product
Radial inductor (closed magnetic circuit type) Core Size 7.8mm x 7.5mm
Product: 744 731 331
Manufacture: Wurth Electronix
3 Diode Selection
3.1 Flywheel Diode: D1
Flywheel diode uses fast diode (fast recovery diode).The reverse voltage of the diode is VIN (Max): 380 V when the output
voltage at startup is 0 V. Consider the derating and select 600 V diode. The condition where the effective current of the diode is
maximized is when the input voltage is the maximum voltage VIN (Max): 380 V, the maximum load current Io (Max): 0.175 A,
and the switching frequency is 94 kHz at the minimum.
ܦݑݐݕ ൌ ೀೆାಷ
ಿሺெ௫ሻൌͶǤʹ [%]
The average current ID of the diode is calculated from the peak current IP: 0.368 A by the following formula
ܫሺݎ݉ݏሻൌܫ
ൈටଵି௨௧௬
ଷൌͲǤʹͲͺ [A]
Select the rated current of 0.208 A or more.
In fact, we used RFN1LAM6S of 0.8 A / 600 V product as a result of mounting the board and considering the parts temperature.
3.2 VCC Rectifier Diode: D2
Rectifier diodes are used for diodes to supply VCC. The reverse voltage applied to the diode is VIN (Max): 380 V. Consider the
derating and select 600 V diodeSince the current flowing to the IC is small enough, we use the 0.2 A / 600 V RRE02VSM6S.
User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.003
2018.3
%037)(9.
Design Overview – Continued
4 Capacitor Selection
4.1 Input Capacitor: C1
The input capacitor is determined by input voltage VI and output power POUT. As a guide, for an input voltage of 90 to 264 Vac, 2
x POUT [W] ȝF. For 176 to 264 Vac, set 1 x POUT [W] ȝF. Since the output power POUT = 2.63 W, 4.7 ȝF / 400 V is selected with a
guidline of 5.38 ȝF.
4.2 VCC Capacitor: C3
The VCC capacitor C3 is required for stable operation of the device and stable feedback of the output voltage. A withstand
voltage of 25 V or more is required, and 1.0 ȝF to 4.7 ȝF is recommended. 1 ȝF / 50 V is selected.
4.3 Output Capacitor: C2, C4
For the output capacitor, select output voltage VO of 25 V or more in consideration of derating. For C2 electrolytic capacitors,
capacitance, impedance and rated ripple current must be taken into consideration.
The output ripple voltage is a composite waveform generated by electrostatic capacity: COUT, impedance: ESR when the ripple
component of inductor current: ǻIL flows into the output capacitor and is expressed by the following formula.
οܸݎ݈݅݁ ൌ οܫൈ൬ ͳ
ͺൈܥݑݐൈ݂
௦௪൰ܧܴܵ
The inductor ripple current is
οܫൌʹൈሼܫെܫ
ை்ሺ݉ܽݔሻሽൌʹൈሺͲǤ͵ͺെͲǤͳͷሻൌ ͲǤ͵ͺ [A]
For this EVK, we use electrostatic capacity: 220 ȝF, ESR: 0.075 ȍ, and the design value of output ripple voltage is less than
100 mV.
οܸݎ݈݅݁ ൌ οܫൈቄቀଵ
଼ൈ௨௧ൈೞೢቁܧܴܵቅൌ ͲǤ͵ͺൈቄቀଵ
଼ൈଶଶఓൈଵቁͲǤͲͷቅൌ͵ͳǤͳ [mV]
Next, check whether the ripple current of the capacitor satisfies the rated ripple current.
Inductor ripple current RMS conversion,
ܫሾݎ݉ݏሿൌοܫ
ൈටଵ
ଷൌͲǤʹʹ͵ [A]
The ripple current of the capacitor is
ܫሾݎ݉ݏሿൌටܫଶെܫ
ை்ଶൌξͲǤʹʹ͵ଶെͲǤͳͷଶൌ ͲǤͳ͵ͺ [A]
User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.003
2018.3
%037)(9.
4.3 Output Capacitor C2, C4 - Continued
Select a rated current of 0.138 A or more.
The output capacitor C2 used a rated ripple current of 0.75 A at 220 ȝF / 25 V.
C8 has added a 0.1 ȝF ceramic capacitor to reduce switching noise.ಿ峘৭
5. Resistor Selection
5.1 Bleeder Resister: R1
Because it is indirectly fed back to the output voltage, the output voltage increases at light load. This board uses bleeder
resistance for its improvement. Reducing the resistance value improves the rise in the output voltage of the light load, but
increases the power loss. 10 kȍ / 0.1 W is used.
User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.003
2018.3
%037)(9.
Performance Data
Constant Load Regulation
Figure 9. Load Regulation (IOUT vs VOUT) Figure 10. Load Regulation (IOUT vs Efficiency)
Table 2. Load Regulation (VIN=100 Vac) Table 3. Load Regulation (VIN=230 Vac)
IOUT VOUT Efficiency IOUT VOUT Efficiency
44 mA 14.791 V 78.32 % 44 mA 14.792 V 72.08 %
88 mA 14.671 V 81.99 % 88 mA 14.671 V 77.17 %
132 mA 14.630 V 83.14 % 132 mA 14.630 V 79.87 %
175 mA 14.604 V 83.24 % 175 mA 14.604 V 81.03 %
Figure 11. Load Regulation (IOUT vs PLOSS) Figure 12. Load Regulation (IOUT vs PLOSS)
13.5
14.0
14.5
15.0
15.5
16.0
16.5
0 100 200 300 400
Output Voltage [V]
Output Current [mA]
-VIN= 100 Vac
-VIN=230 Vac
0
10
20
30
40
50
60
70
80
90
100
0 25 50 75 100 125 150 175
Efficiency [%]
Output Current [mA]
-VIN=100 Vac
-VIN=230 Vac
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0 25 50 75 100 125 150 175
Power Loss [W]
Output Current [mA]
-VIN=100 Vac
-VIN=230 Vac
0.0
0.1
0.2
0.3
0.4
0.5
110100
Power Loss [W]
Output Current [mA]
-VIN=100 Vac
-VIN= 230 Vac
User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.003
2018.3
%037)(9.
3HUIRUPDQFH'DWD&RQWLQXHG
Table 4. Load Regulation : VIN=100 Vac㻌㻌㻌㻌㻌㻌㻌㻌 㻌Table 5. Load Regulation: VIN=230 Vac
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User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.003
2018.3
%037)(9.
Performance Data - Continued
Line Regulation
Figure 13. Line Regulation (VIN vs VOUT) Figure 14. Line Regulation (VIN vs Efficiency)
Switching Frequency Coil Peak Current
Figure 15. Switching Frequency (IOUT vs fSW) Figure 16. Coil Peak Current (IOUT vs IP)
13.5
14.0
14.5
15.0
15.5
16.0
16.5
80 100 120 140 160 180 200 220 240 260 280
Output Voltage [V]
Input Voltage [Vac]
-IOUT= 10 mA
-IOUT= 50 mA
-IOUT=100 mA
-IOUT=175 mA
0
10
20
30
40
50
60
70
80
90
80 100 120 140 160 180 200 220 240 260 280
Efficiency [%]
Input Voltage [Vac]
-IOUT= 10 mA
-IOUT=50 mA
-IOUT=100 mA
-IOUT=175 mA
0
20
40
60
80
100
120
0 25 50 75 100 125 150 175
Switching Frequency [kHz]
Output Current [mA]
-VIN=115 Vac
VIN=230 9DF
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0 255075100125150175
Coil Peak Current [A]
Output Current [mA]
-VIN=115 Vac
-VIN=230 Vac
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User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.003
2018.3
%037)(9.
3HUIRUPDQFH'DWDt&RQWLQXHG
Parts surface temperature
Table 6. Parts surface temperature پTa = 25 °C, measured 30 minutes after setup
Part Condition
V
IN = 90 Vac,
IOUT = 0.175 A
V
IN = 264
V
ac,
IOUT = 0.175 A
IC1 54.0 °C 64.3 °C
D1 56.3 °C 61.3 °C
L1 54.3 °C 64.9 °C
User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.003
2018.3
%037)(9.
6FKHPDWLFV
VIN = 90 ~ 264 Vac, VOUT = 15 V
Figure 23. BM2P159T1F-EVK-001 Schematics
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Notice
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Notes
The information contained herein is subject to change without notice.
Before you use our Products, please contact our sales representative
and verify the latest specifica-
tions :
Although ROHM is continuously working to improve product reliability and quality, semicon-
ductors can break down and malfunction due to various factors.
Therefore, in order to prevent personal injury or fire arising from failure, please take safety
measures such as complying with the derating characteristics, implementing redundant and
fire prevention designs, and utilizing backups and fail-safe procedures. ROHM shall have no
responsibility for any damages arising out of the use of our Poducts beyond the rating specified by
ROHM.
Examples of application circuits, circuit constants and any other information contained herein are
provided only to illustrate the standard usage and operations of the Products. The peripheral
conditions must be taken into account when designing circuits for mass production.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly,
any license to use or exercise intellectual property or other rights held by ROHM or any other
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The Products specified in this document are not designed to be radiation tolerant.
For use of our Products in applications requiring a high degree of reliability (as exemplified
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Do not use our Products in applications requiring extremely high reliability, such as aerospace
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ROHM shall have no responsibility for any damages or injury arising from non-compliance with
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ROHM.
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