ac/dc con converter pwm method v bm 9t1f reference board · 2019. 4. 17. · non-isolat bm a ion b...
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Guide
G074E Rev.0032018.3
ut current sup
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n the right.
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V
er’s Guide
G074E Rev.0032018.3
e
33
User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.0032018.3
Application Circuit VIN = 90 ~ 264 Vac, VOUT = 15 V
Figure 4. BM2P159T1F-EVK-001 Application 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.
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.
VCC1
N.CN.C.DRAIN
N.C.GND_IC
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er’s Guide
G074E Rev.0032018.3
e:
60 V to 16.21 V
to 650 V
0.85 mA(Typ
0.45 mA(Typ
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2.
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esign OveImportant Par
VIN
VOUT
IOUT(Typ
IOUT(Max
fSW
Ipeak(M
Coil Selection
.1 Determinin
The switch
continuous
Furthermo
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It tends to
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Calculate L
Then, the
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ore, this revers
The constant
be in continuo
lculate with inp
output voltage
the maximum
minimum switc
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L value to ope
L value is prov
oltage Range A
Voltage DC 15
nt Output Curr
tput Current 0
ng Frequency
urrent Limit Mi
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mode determ
), reverse curr
e current beco
load current I
ous mode (CC
put voltage mi
e VOUT: 15 V an
value of Duty
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Max)
erate in discont
visionally selec
AC 90 V ~ 264
5 V
ent 0.175 A
0.175 A
Min:94 kHz, T
n:0.395 A, Typ
ines the L valu
rent in trr of the
omes the peak
OUT (Typ): 0.17
CM) when the
nimum voltage
nd the diode V
y: Duty (Max).
cy fSW (Min) = 9
[ s
tinuous mode.
cted to be 330
4 Vac (DC 100
Typ:100 kHz, M
p:0.450 A, Max
ue so that it be
e diode flows,
k current when
75 A, the peak
[A]
input voltage
e 100 Vdc.
VF: 1 V,
94 kHz,
ec]
.
[ H]
0 H in conside
0 V ~ 380 V)
Max:106 kHz
x:0.505A
ecomes as dis
which leads to
the MOSFET
k current IL flow
Figu
eration of gene
scontinuous mo
o an increase
T is ON, and the
wing through t
ure 7. Coil curr
erality.
Use
No. 60UG
ode (DCM) as
in power loss
e power loss o
he inductor is:
rent waveform
er’s Guide
G074E Rev.0032018.3
s possible. In th
of diode.
of the MOSFET
:
m in BCM
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33
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2018 ROHM C
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Also, calcu
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switching f
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Since the t
when dete
It is confirm
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ng coil inducta
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s calculated b
frequency fSW
he minimum va
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p. The peak c
current IP at th
the discontinu
total of ON tim
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so that the ove
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(Min) = 94 kH
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current Ip is ob
Fig
he time of over
uous mode (DC
me and OFF tim
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ercurrent detec
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in): 0.395 A of
c occurs, in rea
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[μ
[μsec]
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sec]
sec]
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e of overcurren
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tion current is 2
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nt detection cu
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t slope at swit
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n switching cy
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[mA]
204 mA and th
ad current IOUT
ting in continu
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urrent, the MO
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ching ON to
ction (DCM)
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ycle, it become
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he maximum lo
Use
No. 60UG
T: 175 mA or m
uous mode at t
e coil current a
OSFET is turne
value and the p
IL,
es discontinuou
s mode (DCM)
oad current is
er’s Guide
G074E Rev.0032018.3
more. Overcurr
the minimum
at switching O
ed OFF. Since
peak current
us mode (DCM
): IOUT (LIM) i
175 mA or mo
e
33
rent
N)
a
M)
is
ore.
User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.0032018.3
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.
[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.
[%]
The average current ID of the diode is calculated from the peak current IP: 0.368 A by the following formula
[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 diode Since 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.0032018.3
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] F. For 176 to 264 Vac, set 1 x POUT [W] F. Since the output power POUT = 2.63 W, 4.7 F / 400 V is selected with a
guidline of 5.38 F.
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 F to 4.7 F is recommended. 1 F / 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: IL flows into the output capacitor and is expressed by the following formula.
The inductor ripple current is
[A]
For this EVK, we use electrostatic capacity: 220 F, ESR: 0.075 , and the design value of output ripple voltage is less than
100 mV.
[mV]
Next, check whether the ripple current of the capacitor satisfies the rated ripple current.
Inductor ripple current RMS conversion,
[A]
The ripple current of the capacitor is
[A]
User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.0032018.3
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 F / 25 V.
C8 has added a 0.1 F ceramic capacitor to reduce switching noise.
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 k / 0.1 W is used.
User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.0032018.3
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
Out
put V
olta
ge [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 175E
ffici
ency
[%]
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
Pow
er L
oss
[W]
Output Current [mA]
- VIN=100 Vac- VIN=230 Vac
0.0
0.1
0.2
0.3
0.4
0.5
1 10 100
Pow
er L
oss
[W]
Output Current [mA]
- VIN= 100 Vac- VIN= 230 Vac
User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.0032018.3
Table 4. Load Regulation : VIN=100 Vac Table 5. Load Regulation: VIN=230 Vac
User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.0032018.3
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
Out
put V
olta
ge [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 280E
ffici
ency
[%]
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
Sw
itchi
ng F
requ
ency
[kH
z]
Output Current [mA]
- VIN=115 VacVIN=230
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0 25 50 75 100 125 150 175
Coi
l Pea
k C
urre
nt [
A]
Output Current [mA]
- VIN=115 Vac- VIN=230 Vac
© 2
O
2018 ROHM C
Output Ripple V
Figure 1
Figure 1
Figure 2
VOUT
VOUT
VOUT
Vo: 20m
Vo: 20m
Vo: 20m
Co., Ltd.
Voltage
17. VIN = 115 V
19. VIN = 115 V
21. VIN = 115 V
Ripple Voltag
Ripple Volta
Ripple Voltag
mV/div
mV/div
mV/div
Vac, IOUT = 10 m
Vac, IOUT = 0.15
Vac, IOUT = 0.17
ge: 22 mVpp
age: 27 mVpp
ge: 18 mVpp
mA
50 A
75 A
Fig
Fig
Fig
VO
VO
VO
gure 18. VIN = 2
gure 20. VIN = 2
gure 22. VIN = 2
OUT
UT
OUT
Ripple V
Ripple Volt
Ripple Volta
230 Vac, IOUT =
230 Vac, IOUT =
230 Vac, IOUT =
Voltage: 33 mV
tage: 29 mVpp
age: 26 mVpp
Use
No. 60UG
= 10 mA
= 0.150 A
= 0.175 A
Vpp
p
er’s Guide
G074E Rev.0032018.3
e
33
User’s Guide
© 2018 ROHM Co., Ltd. No. 60UG074E Rev.0032018.3
Parts surface temperature
Table 6. Parts surface temperature Ta = 25 °C, measured 30 minutes after setup
PartCondition
VIN = 90 Vac, IOUT = 0.175 A
VIN = 264 Vac, 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.0032018.3
VIN = 90 ~ 264 Vac, VOUT = 15 V
Figure 23. BM2P159T1F-EVK-001 Schematics
Table 7. BoM of BM2P159T1F-EVK-001
VCC1
N.CN.C.DRAIN
N.C.GND_IC
N.C.N.C.
234
8765
© 2
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2018 ROHM C
ze: 18 mm x 40
Co., Ltd.
0 mm
Figure 24.
Figure 25.
TOP Silkscree
Bottom Layou
en (Top view)
ut (TOP View)
Use
No. 60UG
er’s Guide
G074E Rev.0032018.3
e
33
Notice
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No t e s
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 parties. ROHM shall have no responsibility whatsoever for any dispute arising out of the use of such technical information.
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 below), please contact and consult with a ROHM representative : transportation equipment (i.e. cars, ships, trains), primary communication equipment, traffic lights, fire/crime prevention, safety equipment, medical systems, servers, solar cells, and power transmission systems.
Do not use our Products in applications requiring extremely high reliability, such as aerospace equipment, nuclear power control systems, and submarine repeaters.
ROHM shall have no responsibility for any damages or injury arising from non-compliance with the recommended usage conditions and specifications contained herein.
ROHM has used reasonable care to ensur the accuracy of the information contained in this document. However, ROHM does not warrants that such information is error-free, and ROHM shall have no responsibility for any damages arising from any inaccuracy or misprint of such information.
Please use the Products in accordance with any applicable environmental laws and regulations, such as the RoHS Directive. For more details, including RoHS compatibility, please contact a ROHM sales office. ROHM shall have no responsibility for any damages or losses resulting non-compliance with any applicable laws or regulations.
When providing our Products and technologies contained in this document to other countries, you must abide by the procedures and provisions stipulated in all applicable export laws and regulations, including without limitation the US Export Administration Regulations and the Foreign Exchange and Foreign Trade Act.
This document, in part or in whole, may not be reprinted or reproduced without prior consent of ROHM.
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