ROHM BD9E303EFJ-LB DC Converter Evaluation Board User Guide

ROHM BD9E303EFJ-LB DC Converter Evaluation Board

Specifications

• Input Voltage Range: 7.0V to 36V
• Output Voltage: 5.0V
• Output Current Rating: Maximum 3A
• Loop Band Width: 300 kHz
• Phase Margin: 30 degrees
• Maximum Efficiency: 91.1%

Product Usage Instructions

Operation Procedures

1. Ensure you have the following equipment ready:
   • DC power-supply of 7.0V to 36V/3A
   • Maximum 3A load
   • DC voltmeter
2. Connect the components as shown in the Connection Diagram (Figure 1) provided in the User’s Guide.

Circuit Diagram
Refer to the circuit diagram (Figure 2) for the detailed layout and components of the BD9E303EFJ-EVK-001 Evaluation Board.

Bill of Materials
Check the Bill of Materials for the components used in the circuit, including capacitors, resistors, inductors, ICs, and terminal blocks.

Layout
Study the layout diagrams (Top Silk Screen, Top Side Layout, L2 Layout, L3 Layout, Bottom Side Layout) to understand the physical arrangement of components on the board.

FAQ

• Q: Can the output voltage be adjusted?
  A: Yes, the output voltage can be set by changing the external parts of the circuit.

• Q: What is the maximum output current rating?
  A: The maximum output current rating is 3A.

• Q: How do I adjust the loop-response characteristics?
  A: The loop-response characteristics can be adjusted by the phase compensation circuit.

Switching Regulator Series
Step-Down DC/DC Converter
BD9E303EFJ-LB Evaluation Board
BD9E303EFJ-EVK-001
BD9E303EFJ-EVK-001 Evaluation board delivers an output 5.0 volts from an input 7.0 to 36 volts using BD9E303EFJ-LB, a synchronous rectification step-down DC/DC converter integrated circuit, with output current rating of maximum 3A. The output voltage can be set by changing the external parts of circuit and the loop-response characteristics also can be adjusted by the phase compensation circuit.

Performance specification

These are representative values, and it is not a guaranteed against the characteristics. VIN = 24V, VOUT = 5.0V, Unless otherwise specified.

(NOTE1) However, (VIN×0.06) ≥ 1.0V

Operation Procedures

1. Necessary equipments
2. DC power-supply of 7.0V to 36V/3A
3. Maximum 3A load
4. DC voltmeter
5. Connecting the equipments
6. DC power-supply presets to 24V and then the power output turns off.
7. The maximum load should be set at 3A and over it will be disabled.
8. Check Jumper pin of SW1 is short, between intermediate-terminal and OFF-side terminal.
9. Connect positive-terminal of power-supply to VIN+ terminal and negative-terminal to GND-terminal with a pair of wires.
10. Connect load’s positive-terminal to VOUT+ terminal and negative-terminal to GND-terminal with a pair of wires.
11. Connect positive-terminal of DC voltmeter 1 to TP1 and negative-terminal to TP2 for input-voltage measurement.
12. Connect positive-terminal of DC voltmeter 2 to TP3 and negative-terminal to TP4 for output-voltage measurement.
13. DC power-supply output is turned ON.
14. IC is enable (EN) by shorting Jumper-pin of SW1 between intermediate-terminal and ON-side terminal.
15. Check DC voltmeter 2 displays 5.0V.
16. The load is enabled.
17. Check at DC voltmeter 1 whether the voltage-drop (loss) is not caused by the wire’s resistance.

Enable-Pin
To minimize current consumption during standby-mode and normal operation, Enable-mode can be switched by controlling EN pin (3pin) of the IC. Standby- mode is enabled by shorting Jumper-pin of SW1 between intermediate-terminal and OFF-side terminal and normal-mode operation by shorting between intermediate-terminal and ON-side terminal.
It also can be switched between standby-mode and normal-mode operation by removing Jumper-pin and controlling the voltage between EN and GND-terminal. Standby-mode is enabled when the voltage of EN is under 0.8V, and normal-mode operation when it is over 2.5V.

Circuit Diagram

Bill of Materials

Count

| Reference Designator| ****

Type

| ****

Value

| ****

Description

| Manufacturer Part Number| ****

Manufacturer

| Configuration (mm)
---|---|---|---|---|---|---|---
2| C1, C7| Ceramic Capacitor| 0.1µF| 50V, X7S, ±10%| GRM155C71H104KE19| MURATA| 1005
1| C2| Ceramic Capacitor| 10µF| 50V, X7T, ±10%| GRM31CD71H106KE11| MURATA| 3216
0| C3| Ceramic Capacitor| –| –| –| –| –
2| C4, C5| Ceramic Capacitor| 22µF| 10V, X7T, ±20%| GRM21BD71A226ME44| MURATA| 2012
1| C6| Ceramic Capacitor| 6800pF| 50V, C0G, ±5%| GRM1555C1H682JE01| MURATA| 1005
0| C8| Ceramic Capacitor| –| –| –| –| –
1| L1| Inductor| 10µH| ±20%, 4.3A| 1217AS-H-100M| MURATA| 8080
1| R1| Resistor| 30kΩ| 1/16W, 1%| MCR01 series| ROHM| 1005
1| R2| Resistor| 7.5kΩ| 1/16W, 1%| MCR01 series| ROHM| 1005
1| R3| Resistor| 15kΩ| 1/16W, 1%| MCR01 series| ROHM| 1005
1| R4| Resistor| 0Ω| Jumper| MCR01 series| ROHM| 1005
1| SW1| Pin header| –| –| –| –| –
1| U1| IC| –| Buck DC/DC Converter| BD9E303EFJ-LB| ROHM| HTSOP-J8
2| J1, J2| Terminal Block| –| –| –| –| –
1| –| Jumper| –| –| –| –| –

(Note) The parts used may have been changed from the part numbers listed in the User’s Guide due to reasons such as discontinuation of production.

Layout
PCB size: 50mm×50mm×1.6mm

Revision History

Application data has been removed as it can be referenced in the datasheet.

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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