ROHM BD9611MUV 1ch Buck Switching Regulator User Guide

1ch Buck switching regulator
BD9611MUV EVK
BD9611MUV-EVK-001 (24V → 12V, 10A)
User’s Guide

Notice

＜High Voltage Safety Precautions ＞
◇ Read all safety precautions before use
Please note that this document covers only the BD9611MUV evaluation board (BD9611MUVEVK-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).

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.

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.

ROHM Switching Regulator Solutions
1ch Buck switching regulator
BD9611MUV EVK
BD9611MUV-EVK-001 (24V → 12V, 10A)

Introduction

This user’s guide will provide the steps necessary to operate the BD9611MUV- EVK-001 and evaluate ROHM’s BD9611MUV synchronous buck-boost DC/DC controller. Component selection, operating procedures and application data are included.

Description

Using a synchronous rectified step-down DC/DC converter IC BD9611MUV, BD9611MUV-EVK-001 evaluation board outputs 12 V with a 15V to 36V input voltage and provides 10A output current. Output current is possible with current settings by selecting high rated current FET and coil. It is possible to adjust the loop characteristics by phase compensation components and can set the output voltage by changing the IC external parts.

Application
General Portable Equipment such as:

•  Amusement machines
• Industrial Equipment
• Office Automation Equipment
• LED lighting
• General equipment that require 24V or 48V supply

Evaluation Board Operating Limits and Absolute Maximum Ratings
(This is not typical and the characteristics）
Unless otherwise specified：VIN = 24V, VOUT = 12V, IOUT=6A

Table 1. Operating Limits

RD1=10kΩ, RD2=short

Output Voltage range| 1| | VIN×0.8| V|
Output Current| 0| | 10| A|
Closed Loop Band Width| 12.02| kHz|
Phase margin| 82.34| °| IOUT = 8A
Soft Start Time| 8| ms|
Operating frequency| 250| kHz|
Maximum Efficiency| 95.1| %| IOUT = 4A

EVK overview

EVK Schematic
VIN = 15V to 36V, VOUT = 12V

Operating Procedure

1. Connect power supply’s GND terminal to GND on the evaluation board.
2.  Connect power supply’s VIN terminal to VIN test point on the evaluation board. This will provide the power supply voltage to the IC. The EN pin of this evaluation board is set to input the resistive divided voltage of the VIN pin.
3.  The output voltage can be measured at the test point VOUT. Now turn on the load. Connect an electronic load or resistive load to the VOUT pin and apply the load.The load can be increased up to 10A MAX.

Enable
The board can switch between normal operation and standby mode to minimize power consumption by controlling the CTL of the IC (19 pin). By default, it is controlled using voltage divider resistor network of R5, R6, R7, and R8 which is referenced from VIN.
SW1 is not mounted on the EVK, but when using SW1, opening R5, R6, R7, and R8 and shorting R9, enables the use of SW1. Switching it to the GND will enter Standby Mode while switching it to VIN will enter to Normal operation. In addition, by removing R9 and controlling the voltage between the CTL and GND pins, standby mode and normal operation can be switched. When the voltage on the CTL pin is less than 2.6V, standby mode is used, and when the voltage is 2.6V or higher, normal operation is performed. Since the hysteresis voltage is set by an internal low current and an external resistor, when the CTL pin is directly controlled by voltage, the hysteresis voltage is determined by the impedance of the power supply supplying the voltage to the CTL pin and the internal constant current.

Evaluation Board BOM (VOUT =12V)
Table 2. Part list (12V output voltage setting) 

Coun

t

| Parts No.| Type| Value| Description| Manufacturer| Manufacturer| Configuration
---|---|---|---|---|---|---|---
Part Number| inch(mm)
1| U1| IC| –| Buck DC/DC Controller| BD9611MUV-E2| ROHM| 1515(4040)
1| R1| Resistor| 1kΩ| 0.1W, 1%| MCR03EZPFX1001| ROHM| 0603(1608)
1| R2| Resistor| 15kΩ| 0.1W, 1%| MCR03EZPFX1502| ROHM| 0603(1608)
1| R5| Resistor| 27kΩ| 0.1W, 1%| MCR03EZPFX2702| ROHM| 0603(1608)
1| R7| Resistor| 5.1kΩ| 0.1W, 1%| MCR03EZPFX5101| ROHM| 0603(1608)
1| R8| Resistor| 430Ω| 0.1W, 1%| MCR03EZPFX4300| ROHM| 0603(1608)
1| RU1| Resistor| 120kΩ| 0.1W, 1%| MCR03EZPFX1203| ROHM| 0603(1608)
2| RU2, RCL| Resistor| 20kΩ| 0.1W, 1%| MCR03EZPFX2002| ROHM| 0603(1608)
1| RD1| Resistor| 10kΩ| 0.1W, 1%| MCR03EZPFX1002| ROHM| 0603(1608)
1| RT| Resistor| 75kΩ| 0.1W, 1%| MCR03EZPFX7502| ROHM| 0603(1608)
1| RHG| Resistor| 10Ω| 0.1W, 1%| MCR03EZPFX10R0| ROHM| 0603(1608)
2| DI1, DI2| Diode| 20V/

1A

| VF(max)=0.42V

@IF=1A

| RB161VAM-20TR| ROHM| 0705(2014)
1| RS| Resistor| 5mΩ| 2W, 1%| PMR100HZPFU5L00| ROHM| 6432(2512)
1| C1| Ceramic Capacitor| 180pF| 100V, 5%, NP0| GRM1555C2A181JE01| MURATA| 0402(1005)
1| C2| Ceramic Capacitor| 2200pF| 50V, 5%, CH| GRM1882C1H222JA01| MURATA| 0603(1608)
2| CSS, CRTSS| Ceramic Capacitor| 0.01µF| 50V, 5%, CH| GRM1882C1H103JA01D| MURATA| 0603(1608)
1| CREG10| Ceramic

Capacitor

| 1µF| 50V, 10%, X5R| GRM155R61H105KE05| MURATA| 0402(1005)
1| CBST| Ceramic

Capacitor

| 0.47µF| 25V, 10%, X7R| GRM188R71E474KA12D| MURATA| 0603(1608)
4| CIN| Ceramic Capacitor| 10µF| 100V, 22%, X7S| GRM32EC72A106KE05K| MURATA| 1210(3225)
1| COUT1| Aluminum Electrolytic Capacitor| 220µF| 50V, 20%| UVR1H221MPD1TD| Nichicon| 0504(1210)
4| COUT2| Ceramic Capacitor| 10µF| 50V, 10%, B| GRM32EB31H106MA12| MURATA| 1210(3225)
1| CVCC| Ceramic Capacitor| 1µF| 100V, 22%, X7S| GRM21BC72A105KE01| MURATA| 0805(2012)
1| CREG5| Ceramic Capacitor| 0.1µF| 25V, 10%, X7R| GRM155R71E104KE14D| MURATA| 0402(1005)
2| Tr1, Tr2| FET| 60V/

22A

| Nch, VGS=3V, RDS(on)=18mΩ 30nC,DPAK-3| RD3L220SNTL1| ROHM| 2426(6266)
1| L1| Inductor| 7.7µH| 10A| CDEP147NP-7R7MC-95| Sumida| 0.59 x 0.59 (14.9 x 14.9)

11

| R0, R6, RD2, RLG, RBST, RCLH, RCLL, RVCC, CSYNC, J2, DI3| –| –| Short| –| –| –
10| R3, R4, R9, RD3, RD4, C3 RCLK, RSYNC, CCL, J1|

–

| –| Open| –| –| –

Recommended parts are selected from those products and information available at the time this data sheet (Rev.004) was released. If supply conditions change and parts are not available, use similar parts.
LX pin overshoot voltage countermeasure: Snubber Circuit
Overshoot voltage of LX pin is caused by the parasitic capacitance of the high-side and low-side FET and parasitic inductance of the board layout pattern. The power supply voltage range and load range used, and also the output short circuit must ensure that LX pin voltage does not exceed the recommended operating range.
If the overshoot voltage of the LX pin is large, set a snubber circuit in where the resistor RSNB and the capacitor CSNB are connected in series between the LX pin and PGND, as described in Figure 5 and prevent overshoot.
※RSNB and CSNB are not in the evaluation board pattern. It is recommended to place the pattern to allow countermeasures when an overshoot occurs.

DI2 and DI3 between output voltage and REG10
By connecting the diode of DI3 between the output and REG10, loss can be reduced by supplying power from the output voltage instead of REG10 inside the IC.
For the REG10 maximum rated voltage of 15V, it is necessary to consider output voltage fluctuations (IC variations, resistance tolerances, load fluctuations) and other factors.
＜Precaution＞
This document is an example of BD9611MUV application circuit and operation; it is not a guarantee to work.

Products listed in the Part list
The product names listed in the part list are available ones at the time of creating this user’s guide. In case some parts are no longer available in the future, select the equivalent products.

Revision History

in table 2.
30. Nov. 2022| 004| p.1 Updated “Introduction” and “Application”.
p.1 Corrected ” with a 15V to 24V input voltage ” to ” with a 15V to 36V input voltage”.
p.2 Updated “EVK overview”.
p.2 Changed schematic drawing. There is no change in component constants.
p.2 Corrected “VIN 30V” to “VIN 36V”.
p.4 Update part number of Tr1 and Tr2 in table 2.
p.4 Update part number of DI1 and DI2 from RB161VA-20 to RB161VAM-20TR.
p.4 Update part number of all ceramic capacitors in table 2.
p.5 Updated “DI2 and DI3 between output voltage and REG10”.
p.5 Updated Figure. 5 of snubber circuit.
p.6 to p.8 Updated Figure.6 to Figure.19.
p.8 Update “Board Layout”.
p.11 Update “Products listed in the Part list”.
5. Oct. 2023| 005| p.1 Changed Unit degrees to ° . p.1, p.2, p.3 Change Io to IOUT.
p.2 Change VIN=15.0V to 36V, VOUT=12.0V to VIN=15V to 36V, VOUT=12V.
p.2 Changed schematic drawing. FB and INV connection changed.
p.4 RS of Table.2 is change from PMR100PZPXFU5L00 to PMR100HZPFU5L00.
p.4 Add comment. “Recommended parts are selected from those products and information
available at the time this user’s guide (Rev.004) was released. If supply conditions change and parts are not available, use similar parts.”

Notice

1. The information contained in this document is intended to introduce ROHM Group (hereafter referred to asROHM) products. When using ROHM products, please verify the latest specifications or datasheets before use.
2.  ROHM products are designed and manufactured for use in general electronic equipment and  applications (such as Audio Visual equipment, Office Automation equipment, telecommunication equipment, home appliances, amusement devices, etc.) or specified in the datasheets. Therefore, please contact the ROHM sales representative before using ROHM products in equipment or devices requiring extremely high reliability and whose failure or malfunction may cause danger or injury to human life or body or other serious damage (such as medical equipment, transportation, traffic, aircraft, spacecraft, nuclear power controllers, fuel control, automotive equipment including car accessories, etc. hereafter referred to as Specific Applications). Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any damages, expenses, or losses incurred by you or third parties arising from the use of ROHM Products for Specific Applications.
3. Electronic components, including semiconductors, can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe design against physical injury, and damage to any property, which a failure or malfunction of products may cause.
4.  The information contained in this document, including application circuit examples and their constants, is intended to explain the standard operation and usage of ROHM products, and is not intended to guarantee, either explicitly or implicitly, the operation of the product in the actual equipment it will be used. As a result, you are solely responsible for it, and you must exercise your own independent verification and judgment in the use of such information contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses, or losses incurred by you or third parties arising from the use of such information.
5. When exporting ROHM products or technologies described in this document to other countries, you must abide by the procedures and provisions stipulated in all applicable export laws and regulations, such as the Foreign Exchange and Foreign Trade Act and the US Export Administration Regulations, and follow the necessary procedures in accordance with these provisions.
6. The technical information and data described in this document, including typical application circuits, are examples only and are not intended to guarantee to be free from infringement of third parties intellectual property or other rights. ROHM does not grant any license, express or implied, to implement, use, or exploit any intellectual property or other rights owned or controlled by ROHM or any third parties with respect to the information contained herein.
7.  No part of this document may be reprinted or reproduced in any form by any means without the prior written consent of ROHM.
8.  All information contained in this document is current as of the date of publication and subject to change without notice. Before purchasing or using ROHM products, please confirm the latest information with the ROHM sales representative.
9. ROHM does not warrant that the information contained herein is error-free. ROHM shall not be in any way responsible or liable for any damages, expenses, or losses incurred by you or third parties resulting from errors contained in this document.

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R2043A

References

• ローム株式会社 - ROHM Semiconductor
• ローム株式会社 - ROHM Semiconductor

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