Rohm BM2P141X Manuale utente

AC/DC Converter

Non-Isolation Buck Converter

PWM method 10 W 14 V

BM2P141X Reference Board

Notice

www.rohm.com HVB01E

ᾋ

ᾋᾋ

ᾋHigh Voltage Safety Precautionsᾍ

ᾍᾍ

ᾍ



ۍ Read all safety precautions before use

Please note that this document covers only the BM2P141X evaluation board

(BM2P141X-EVK-001) 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 below.

Before Use

[1] Verify that the parts/components are not damaged or missing (i.e. due to the drops).ᴾ

ᴾᴾ

ᴾ

[2] Check that there are no conductive foreign objects on the board.

[3] Be careful when performing soldering on the module and/or evaluation 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.ᴾ

[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.

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2019.1

User’s Guide

AC/DC Converter

Non-Isolation Buck Converter PWM method Output 10 W 14 V

BM2P141X Reference Board

BM2P141X-EVK-001

The BM2P141X-EVK-001 evaluation board outputs 14 V voltage from the input of 90 Vac to 264 Vac. The output current supplies up

to 0.715 A. The BM2P141X which is PWM method DC/DC converter IC built-in 650 V MOSFET is used.

The BM2P141X 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 65 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 1.5 ȍ 650 V MOSFET built-in

contributes to low power consumption and easy design.

Figure 1. BM2P141X-EVK-001

Electronics Characteristics

Not guarantee the characteristics, is representative value.

Unless otherwise noted :V

= 230 Vac, I

OUT

= 0.5 A, Ta:25 °C

(NOTE1) Please adjust operating time, within any parts surface temperature under 105 °C

(NOTE2) Not include spike noise

Parameter Min Typ Max Units Conditions

Input Voltage Range 90 230 264 Vac

Input Frequency 47 50/60 63 Hz

Output Voltage 12.6 14.0 15.4 V

Maximum Output Power - - 10.0 W I

OUT

= 0.715 A

Output Current Range

(NOTE1)

0.000 0.500 0.715 A

Stand-by Power - 150 - mW I

OUT

= 0 A

Efficiency 80.0 83.7 - %

Output Ripple Voltage

(NOTE2)

- 76 - mVpp

Operating Temperature Range -10 +25 +65 °C

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2019.1

User’s Guide

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Operation Procedure

1. Operation Equipment

(1) AC Power supply 90 Vacع264 Vac, over 20W

(2) Electronic Load capacity 0.715 A

(3) Multi meter

2. Connect method

(1) AC power supply presetting range 90~264 Vac, Output switch is off.

(2) Load setting under 0.715 A. 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 VOUT, GND terminal connect to GND 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 14 V.

(9) Electronic load switch ON

(10) Check output voltage drop by load connect wire resistance



Figure 2. Connection Circuit

Deleting

Maximum Output Power Po of this reference board is 10.0 W. The derating curve is shown on the right. If ambient temperature

is over 40°C, Please adjust load continuous time by over 105 °C of any parts surface temperature.

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Power

Supply

DC Multi Meter

Electronics

Load

Power

Meter

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2019 ROHM Co., Ltd. No. 61UG024E Rev.001

2019.1

User’s Guide

%03;(9.

Application Circuit

= 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.

 ൌ ܸ

஼ே்

൅ܸ

ி஽ଶ

െܸ

ி஽ଵ

CNT

: VCC Control Voltage

FD1

: Forward Voltage of diode D1

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.

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2019.1

User’s Guide

%03;(9.

BM2P141X Overview

Feature

 PWM Frequency=65 kHz

 PWM current mode control

 Switching frequency jitter

 Burst function around light load

 650 V Starter

 650 V Super-Junction Power MOSFET

 VCC Under voltage detection

 VCC Over voltage detection

 Cycle by cycle current limiter

 Soft Start function

Key specifications

 Operation Voltage Range: VCC: 12.00 V ~ 15.12 V

DRAIN 650 V(Max)

 Circuit Current(ON): 0.85 mA(Typ)

 Circuit Current (Burst mode): 0.45 mA(Typ)

 Switching Frequency: 65 kHz(Typ)

 Operating Temperature: -40 °C ~ +105 °C

 MOSFET R-ON: 1.5 ȍ(Typ)

'LPHQVLRQ

W(Typ) x D(Typ) x H(Max)



DIP7K 9.20 mm x 6.35 mm x 4.30 mm

Pitch 2.54 mm



Figure 6. Block Diagram Figure 7. DIP7K Package

Table 1. BM2P141X PIN description

No. Name I/O Function ESD Diode

CC GND

1 - - - - -

2--- --

3 GND_IC I/O GND ط-

4 - - - - -

5 VCC I Vcc - ط

6 DRAIN I/O MOSEFET DRAIN - ط

7 DRAIN I/O MOSEFET DRAIN - ط

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2019 ROHM Co., Ltd. No. 61UG024E Rev.001

2019.1

User’s Guide

%03;(9.

Design Overview

1 Important parameter

 V

: Input Voltage Range AC 90 V ~ 264 Vac (DC 100 V ~ 380 V)

 V

OUT

: Output Voltage DC 14 V

 I

OUT

(Typ) : Constant Output Current 0.5 A

 I

OUT

(Max) : Maximum Output Current 0.715 A

 f

: Switching Frequency Min:60 kHz, Typ:65 kHz, Max:70 kHz

 Ipeak(Min) : Over Current Detection Current Min:1.8 A, Typ:2.0 A, Max:2.2A

2 Coil Selection

2.1 Determining Coil Inductance

The switching operation mode determines the L value so that it becomes as discontinuous mode (DCM) as possible. In the

continuous mode (CCM), reverse current in trr of the diode flows, which leads to an increase in power loss of diode.

Furthermore, this reverse current becomes the peak current when the MOSFET is ON, and the power loss of the MOSFET also

increases. The constant load current I

OUT

(Typ): 0.5 A, the peak current I

flowing through the inductor is:

ܫ௅ൌܫ

ை௎்ሺܶݕ݌ሻൈʹൌͳǤͲ

[A]

It tends to be in continuous mode (CCM) when the input voltage drops.

Calculate with input voltage minimum voltage 100 Vdc

with 20% margin and V

(Min) = 80 Vdc.

From the output voltage V

OUT

: 14 V and the diode V

: 1 V,

Calculate the maximum value of Duty: Duty (Max).

ሺ݉ܽݔሻൌܸை௎் ൅ܸ

ி

ܸூேሺܯ݅݊ሻൌ ͲǤͳͺͺ

Figure 8. Coil current waveform at OCP detection

From the minimum switching frequency f

(Min) = 60 kHz,

Calculate on time ton (Max)

ሺܯܽݔሻൌ஽௨௧௬ሺெ௔௫ሻ

௙

ೄೈ

ሺெ௜௡ሻൌ͵Ǥͳʹͷ

[ȝsec]

Calculate L value to operate in discontinuous mode.

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಺

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ூ

ಽ

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[ȝH]

RPD[

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2019 ROHM Co., Ltd. No. 61UG024E Rev.001

2019.1

User’s Guide

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2.1 Determining Coil Inductance – Continued

Also, calculate L value so that the overcurrent detection becomes maximum load current I

OUT

: 715 mA or more. Overcurrent

detection is calculated by the current flowing through the MOSFET when operating in continuous mode at the minimum

switching frequency f

(Min) = 60 kHz. When the current flowing through the MOSFET ( the coil current at switching ON)

exceeds the minimum value Ipeak (Min): 1.8 A of the overcurrent detection current, the MOSFET is turned OFF. Since a delay

of approximately tdly = 0.1 ȝsec occurs, in reality, the peak current exceeds the Ipeak value and the peak current becomes Ip.

The peak current Ip is obtained by setting the current slope at switching ON to ǻI

ܫ௉ൌܫ݌݁ܽ݇൅οܫ

௅ൈݐ݈݀ݕ

ܫ௉ൌܫ݌݁ܽ݇൅ܸூே െܸ݋

ܮൈݐ݈݀ݕ

Calculate the output current Io (LIM) at overcurrent detection by securing a margin of 10% from the maximum load current of

715 mA, and setting it as 787 mA.

ܫை௎்ሺܮܫܯሻൌܫ݌െܫݎ݅݌݌݈݁

ʹ൐ܫ

ை௎்ሺܯܽݔሻ

Calculate the minimum value of the L value of the coil. From the above formula,

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ಷ

ሻሽൈሺ௏

಺ಿ

ሺெ௜௡ሻି௏

ೀೆ೅

ሻ

ଶൈ௙

ೄೈ

ሺெ௜௡ሻൈ൫ூ

ೀೆ೅

ሺெ௔௫ሻିூ௣௘௔௞ሺெ௜௡ሻ൯ൈ௏

಺

ሺெ௜௡ሻൌͻͷǤͲ

[ȝH]

Therefore, the inductance value of the coil is discontinuous mode when the rated current Io (Typ) is 0.5 A, and in order to detect

the overcurrent of the maximum load current Io (Max): 0.715 A or more, the condition of 95.0 ȝH to 206.3 ȝH , A coil of 150 ȝH

is selected.

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): 0.715 A, and the switching frequency is

60 kHz at the minimum.The ripple current Iripple of the coil is given by the following formula.

ܫݎ݅݌݌݈݁ ൌ ݀݅

݀ݐൈݐைே ൌሼܸூேሺܯܽݔሻെሺܸை௎் ൅ܸ

ிሻሽ

ܮൈሺܸை௎் ൅ܸ

ிሻ

ܸூேሺܯܽݔሻൈ݂

ௌௐሺܯ݅݊ሻ







2019 ROHM Co., Ltd. No. 61UG024E Rev.001

2019.1

User’s Guide

%03;(9.

2.2 Inductor Current Calculation -Continued

When it is applied to the formula of the peak current,

ܫ݌ ൌ ܫை௎்ሺܯܽݔሻ൅ூ௥௜௣௣௟௘

ଶൌܫ

ை൅ሼ௏

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ሺெ௔௫ሻିሺ௏

ೀೆ೅

ା௏

ಷ

ሻሽሺ௏

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ಷ

ሻ

ଶൈ௅ൈ௏

಺ಿ

ሺெ௔௫ሻൈ௙

ೄೈ

ሺெ௜௡ሻൌͳǤͷʹ

[A]

Select a coil with an allowable current of 1.52 A or more.

In this EVK, we use inductance value: 150 ȝH, rated: 1.9 A product.

Radial inductor (closed magnetic circuit type)Core size DR09 x 11 series

Product: XF1501Y-151

Manufacturer: ALPHA TRANS CO,. LTD

ٿ541-0059 Senbanishi KID Bldg 7F, 4-4-11, Bakurou-machi, Chuo-ku, Osaka

http://www.alphatrans.jp/

3 Diode Selection

3.1 Flywheel Diode : D1

Flywheel diode uses fast diode (fast recovery diode).The reverse voltage of the diode is V

(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 V

(Max): 380 V, the maximum load current Io (Max): 0.715 A,

and the switching frequency is 60 kHz at the minimum.

ܦݑݐݕ ൌ ௏

ೀೆ೅

ା௏

ಷ

௏

಺ಿ

ሺெ௔௫ሻൌ͵Ǥͻ

[%]

The average current ID of the diode is calculated from the peak current Ip: 1.52 A by the following formula

ܫ஽ሺݎ݉ݏሻൌܫ݌ൈටଵି஽௨௧௬

ଷൌ ͲǤͺ͸Ͳ

[A]

Select the rated current of 0.860 A or more.

In fact, we used RFN5BM6S of 5 A / 600 V product as a result of mounting the board and considering the parts temperature.

3.2 VCC Rectifier Diode : D1

Rectifier diodes are used for diodes to supply VCC. The reverse voltage applied to the diode is V

(Max): 380 V. Consider the

derating and select 600 V diodeBecause the current flowing to the IC is small enough, we use the 0.2 A / 600 V

RRE02VSM6S.







2019 ROHM Co., Ltd. No. 61UG024E Rev.001

2019.1

User’s Guide

%03;(9.

Design Overview – Continued

4 Capacitor Selection

4.1 Input Capacitor : C4

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 P

OUT

[W] ȝF. For 176 to 264 Vac, set 1 x P

OUT

[W] ȝF. Since the output power P

OUT

= 10 W, 22 ȝF / 450 V is selected at 20

ȝF or more.

4.2 VCC Capacitor : C6

The VCC capacitor CVCC 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. 2.2 ȝF / 50 V is selected.

4.3 Output Capacitor : C7, C8

For the output capacitor, select output voltage V

of 25 V or more in consideration of derating. For C7 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: ǻI

flows into the output capacitor and is expressed by the following formula.

οܸݎ݅݌݌݈݁ ൌ οܫ௅ൈ൬ ͳ

ͺൈܥ݋ݑݐൈ݂

௦௪൰൅ܧܴܵ

The inductor ripple current,

οܫ௅ൌʹൈሼܫ݌െܫை௎்ሺ݉ܽݔሻሽൌʹൈሺͳǤͷʹെͲǤ͹ͳͷሻൌͳǤ͸ͳ

[A]

For this EVK, we use electrostatic capacity: 680 ȝF, ESR: 0.049 ȍ, and the design value of output ripple voltage is less than

100 mV.

οܸݎ݅݌݌݈݁ ൌ οܫ௅ൈቄቀ ଵ

଼ൈ஼௢௨௧ൈ௙

ೞೢ

ቁ൅ܧܴܵቅൌͳǤ͸ͳൈቄቀ ଵ

଼ൈ଺଼଴ఓൈ଺ହ௞ቁ൅ͲǤͲͶͻቅ ൌ ͺ͵ǤͶ

[mV]

Next, check whether the ripple current of the capacitor satisfies the rated ripple current.

Inductor ripple current RMS conversion,

ܫ௅ሾݎ݉ݏሿൌοܫ

௅ൈටଵ

ଷൌͲǤͻ͵

[A]

The ripple current of the capacitor,

ܫ஼ሾݎ݉ݏሿൌටܫ௅ଶെܫ

ை௎்ଶൌξͲǤͻ͵ଶെͲǤ͹ͳͷଶൌͲǤͷͻ

[A]

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