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© 2018 ROHM Co., Ltd. No. 60UG070E Rev.001
2018.3
User’s Guide
AC/DC Converter
Non-Isolation Buck Converter PWM method Output 2W -12V
BM2P129TF Reference Board
BM2P129TF-EVK-002
The BM2P129TF-EVK-002 evaluation board outputs -12V minus voltage from the input of 90Vac to 264Vac. The
output current supplies up to 0.167A. BM2P109TF which is PWM method DC/DC converter IC built-in 650V MOSFET
is used.
The BM2P129TF contributes to low power consumption by built-in a 650 V starting circuit. Built-in current detection
resistor realizes compact power supply design.
Current mode control imposes current limitation on every cycle, providing superior performance in bandwidth and
transient response. The switching frequency is 100 kHz in fixed mode. At light load, frequency is reduced and high
efficiency is realized. Built-in frequency hopping function contributes to low EMI. Low on-resistance 9.5 Ω 650 V
MOSFET built-in contributes to low power consumption and easy design.
The flywheel diode is a fast recovery diode of 1A/650 V RFN1LAM6S, contributing to low power consumption.
Electronics Characteristics
Not guarantee the characteristics, is representative value.
Unless otherwise noted :V
IN
= 230Vac, I
OUT
= 120mA, Ta:25℃
Parameter Min Typ Max Units Conditions
Input Voltage Range 90 230 264 Vac
Input Frequency 47 50/60 63 Hz
Output Voltage -13.2 -12.0 10.8 V
Maximum Output Power - - 2.0 W I
OUT
= 167mA
Output Current Range
(NOTE1) 2 120 167 mA
Stand-by Power - 44 - mW I
OUT
= 0A
Efficiency - 72.2 - %
Output Ripple Voltage
(NOTE2) - 29 - mVpp
Operating Temperature
Range -10 25 65 ℃
(NOTE1) Please adjust operating time, within any parts surface temperature under 105℃
(NOTE2) Not include spike noise
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© 2018 ROHM Co., Ltd. No. 60UG070E Rev.001
2018.3
User’s Guide
BM2P129TF-EVK-002
Operation Procedure
1. Operation Equipment
(1) AC Power supply 90Vac〜264Vac, over 10W
(2) Electronic Load capacity 0.167A
(3) Multi meter
2. Connect method
(1) AC power supply presetting range 90~264Vac, Output switch is off.
(2) Load setting under 0.167A. Load switch is off.
(3) AC power supply N terminal connect to the board AC (N) of CN1, and L terminal connect to AC(L).
(4) Load + terminal connect to VOUT1, GND terminal connect to GND1 terminal
(5) AC power meter connect between AC power supply and board.
(6) Output test equipment connects to output terminal
(7) AC power supply switch ON.
(8) Check that output voltage is -12V.
(9) Electronic load switch ON
(10) Check output voltage drop by load connect wire resistance
Figure 1. Connection Circuit
Deleting
Maximum Output Power Po of this reference board is 2W. The derating curve
is shown on the right.
if ambient temperature is over 50℃, please adjust load continuous time by
over 105℃ of any parts surface temperature.
Figure 2. Temperature Deleting curve
CN1 : from the top ①:AC (L), ②:AC (N)
AC
Power
Supply
+
−
Multi Meter
V Electronic
Load
Power
Meter
0.0
0.5
1.0
1.5
2.0
2.5
-25 0 25 50 75 100
Output Power Po [W]
Ambient Temparature Ta [℃]
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© 2018 ROHM Co., Ltd. No. 60UG070E Rev.001
2018.3
User’s Guide
BM2P129TF-EVK-002
Schematics
V
IN
= 90～264Vac, V
OUT
= -12V
Figure 3. BM2P129TF-EVK-002 Schematics
Bill of Materials
Table 1. BoM of BM2P129TF-EVK-002
VCC
1
N.C
N.C.
DRAIN
N.C.
GND_IC
N.C.
N.C.
2
3
4
8
7
6
5
VOUT
GND
IC1
BM2P129TF
L
N
R2
10K
MCR10
L2
220μH
1.2A
C2
12μF
400V
C4
220μF
25V
F1
1.0A/AC250V
D3
0.2A/600V
RR E0 2VS M6S
D2
FRD 0.8A/600V
RFN1LA M6S
C3
1μF
25V
C5
0.1μF
25V
CN1_1
CN1_2
AC90-264V
-12V/0.167A
R1
47
2W
C1
0.1μF
X2
L1
470μH
D1
1A/1000V
Part
Reference Qty. Type Value Description Part Number Manufacture Configuration
mm
(
inch
)
C1 1 Film 0.1μF X2 890 334 025 017 CS Wurth -
C2 1 Electrolytic 12μF 400V, ±20% 400BXW12MEFR10X16 Rubycon -
C3 1 Ceramic 1uF 25V, X7R, ±20% TMK107B7105MA-T Taiyo Yuden 1608 (0603)
C4 1 Electrolytic 220uF 25VV, ±20% 860 080 474 010 Wurth -
C5 1 Ceramic 0.1uF 50V, X7R, ±20% HMK107B7104MA-T Taiyo Yuden 1608 (0603)
CN1 1 Connector - 2pin B2P-VH JST -
D1 1 FRD 1A 1000V 1N4007-GP Vishay -
D2 1 FRD 0.8A 600V RFN1LAM6S TR ROHM PMDS
D3 1 Diode 0.2A 600V RRE02VSM6S ROHM TUMD2SM
F1 1 Fuse 1A 250V 39211000000 Littelfuse -
IC1 1 AC/DC Converter - - BM2P129TF ROHM SOP8
L1 1 Coil 470μH 0.25A DRV060-471 Alphatrans -
L2 1 Coil 220μH 1.2A 744 747 122 1 Wurth -
R1 1 Resistor 47Ω 2W, ±5% ERG-2SJ470 Panasonic -
R2 1 Resistor 10kΩ 0.1W, ±5% MCR10EZPJ103 ROHM 2012 (0805)
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© 2018 ROHM Co., Ltd. No. 60UG070E Rev.001
2018.3
User’s Guide
BM2P129TF-EVK-002
PCB
Size : 25 mm x 45 mm
Figure 4. Top Silkscreen (Top view)
Figure 5. Bottom Layout (Top view)
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© 2018 ROHM Co., Ltd. No. 60UG070E Rev.001
2018.3
User’s Guide
BM2P129TF-EVK-002
Performance Data
Figure 6. Load Regulation (I
OUT
vs. V
OUT
) Figure 7. LOAD Regulation (I
OUT
vs. Efficiency)
Figure 8. Load Regulation (I
OUT
vs. P
LOSS
) Figure 9. LOAD Regulation (I
OUT
vs. P
LOSS
)
Table 2. Load Regulation (V
IN
=100Vac) Table 3. Load Regulation (V
IN
=230Vac)
I
OUT
V
OUT
Efficiency
42 mA -11.763 V 71.91 %
84 mA -11.692 V 75.14 %
120 mA -11.663 V 75.49 %
167 mA -11.631 V 75.26 %
-13.2
-12.8
-12.4
-12.0
-11.6
-11.2
-10.8
0 100 200 300
Output Voltage [V]
Output Current [mA]
V
IN
=100Vac
VIN=230Vac
0
10
20
30
40
50
60
70
80
90
100
0 50 100 150 200
Efficiency [%]
Output Current [mA]
V
IN
=100Vac
VIN=230Vac
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0 50 100 150 200
Power Loss [W]
Output Current [mA]
V
IN
=100Vac
VIN=230Vac
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
1 10 100
Power Loss [W]
Output Current [mA]
V
IN
=100Vac
VIN=230Vac
I
OUT
V
OUT
Efficiency
42 mA -11.782 V 66.42 %
84 mA -11.736 V 69.77 %
120 mA -11.665 V 72.15 %
167 mA -11.625 V 74.41 %
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© 2018 ROHM Co., Ltd. No. 60UG070E Rev.001
2018.3
User’s Guide
BM2P129TF-EVK-002
Figure 10. LINE Regulation (I
OUT
vs. V
OUT
) Figure 11. LINE Regulation (I
OUT
vs. Efficiency)
Figure 12. Switching Frequency (I
OUT
vs. F
SW
) Figure 13. Coil Peak Current (I
OUT
vs. I
peak
)
-13.2
-12.8
-12.4
-12.0
-11.6
-11.2
-10.8
80 100 120 140 160 180 200 220 240 260 280
Output Voltage [V]
Input Voltage [Vac]
I
OUT
= 10mA
IOUT= 50mA
IOUT=120mA
IOUT=167mA
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]
I
OUT
= 10mA
IOUT= 50mA
IOUT=120mA
IOUT=167mA
0
20
40
60
80
100
120
0 50 100 150 200
Switching Frequency [kHz]
Output Current [mA]
V
IN
=100Vac
VIN=230Vac
0.0
0.1
0.2
0.3
0.4
0.5
0 50 100 150 200
Coil Peak Current [A]
Output Current [mA]
V
IN
=100Vac
VIN=230Vac
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© 2018 ROHM Co., Ltd. No. 60UG070E Rev.001
2018.3
User’s Guide
BM2P129TF-EVK-002
Figure 14. VOUT Ripple Voltage (I
OUT
vs. V
ripple
)
V
IN
=100Vac, IOUT=10mA V
IN
=100Vac, I
OUT
=120mA V
IN
=100Vac, I
OUT
=167mA
Figure 15. VOUT Ripple Voltage.1 Figure 16. VOUT Ripple Voltage.2 Figure 17. VOUT Ripple Voltage.3
V
IN
=230Vac, IOUT=10mA V
IN
=230Vac, I
OUT
=120mA V
IN
=230Vac, I
OUT
=167mA
Figure 18. VOUT Ripple Voltage.4 Figure 19. VOUT Ripple Voltage.5 Figure 20. VOUT Ripple Voltage.6
0
5
10
15
20
25
30
35
40
0 50 100 150 200
Ripple Voltage [mVpp]
Output Current [mA]
V
IN
=100Vac
VIN=230Vac
Ripple Voltage: 19mVpp Ripple Voltage: 27mVpp Ripple Voltage: 27mVpp
Ripple Voltage: 26mVpp Ripple Voltage: 29mVpp Ripple Voltage: 35mVpp
V
O
: 20mV/div
Time scale 5µs/div Time scale 5μs/div Time scale 5μs/div
Time scale 5μs/div
Time scale 5μs/div
Time scale 20µs/div
V
O
: 20mV/div
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© 2018 ROHM Co., Ltd. No. 60UG070E Rev.001
2018.3
User’s Guide
BM2P129TF-EVK-002
Table 4. Parts surface temperature ※Ta:25℃, measured 30minutes after startup
Part
Condition
V
IN
=90Vac,
I
OUT
=0.120A
V
IN
=90Vac,
I
OUT
=0.167A
V
IN
=264Vac,
I
OUT
=0.120A
V
IN
=264Vac,
I
OUT
=0.167A
IC1 47.7℃ 51.4℃ 64.7℃ 67.4℃
D1 51.2℃ 46.6℃ 56.2℃ 59.6℃
L1 43.7℃ 45.2℃ 52.0℃ 60.3℃
R1102
B
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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
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 ensure the accuracy of the information contained in this
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shall have no responsibility for any damages arising from any inaccuracy or misprint of such
information.
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This document, in part or in whole, may not be reprinted or reproduced without prior consent of
ROHM.
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■<High Voltage Safety Precautions>
◇ Read all safety precautions before use
Please note that this document covers only the BM2P129TF evaluation board
(BM2P129TF-EVK-002) and its functions. For additional information, please refer to the
datasheet.
To ensure safe operation, please carefully read all precautions
before handling the evaluation board
Depending on the configuration of the board and voltages used,
Potentially lethal voltages may be generated.
Therefore, please make sure to read and observe all safety precautions
described in the red box be low.
Before Use
[1] Verify that the parts/components are not damaged or missing (i.e. due to the drops).
[2] Check that there are no conductive foreign objects on the board.
[3] Be careful when performing soldering on the module and/or e valuation board to ensure
that solder splash does not occur.
[4] Check that there is no condensation or water droplets on the circuit board.
During Use
[5] Be careful to not allow conductive objects to come into contact with the board.
[6] Brief accidental contact or even bringing your hand close to the board may result
in discharge and lead to severe injury or death.
Therefore, DO NOT touch the board with your bare hands or bring them too close
to the board.
In addition, as mentioned above please exercise extreme caution when using
conductive tools such as tweezers and screwdrivers.
[7] If used under conditions beyond its rated voltage, it may cause defects such as
short-circuit or, depending on the circumstances, explosion or other permanent
damages.
[8] Be sure to wear insulated gloves when handling is required during operation.
After Use
[9] The ROHM Evaluation Board contains the circuits which store the high voltage. Since it
stores the charges even after the connected power circuits are cut, please discharge the
electricity after using it, and please deal with it after confirming such electric discharge.
[10] Protect against electric shocks by wearing insulated gloves when handling.
This evaluation board is intended for use only in research and development facilities and
should by handled only by qualified personnel familiar with all safety and
operating procedures.
We recommend carrying out operation in a safe environment that includes the use of high
voltage signage at all entrances, safety interlocks, and protective glasses.
