BD95861MUV-EVK-101 ROHM

ROHM Switching Regulator Solutions Evaluation Board: 7.5V to 18V, 6A Integrated MOSFET 1ch Synchronous Buck DC/DC Converter No.000000000 BD95861MUVEVK-101 (5V 6A Output) Introduction This application note will provide the steps necessary to operate and evaluate ROHMs synchronous buck DC/DC converter using the BD95861MUV evaluation boards. Component selection, board layout recommendations, operation procedures and application data is provided. Description This evaluation board has been developed for ROHMs synchronous buck DC/DC converter customers evaluating BD95861MUV. While accepting a wide power supply of 7.5-18V, an output of 0.8V to 5.5V can be produced. The IC has internal 50mohm high-side Nch MOSFET and 30mohm low-side Nch MOSFET and a synchronization frequency range of 500 kHz to 800 kHz. A fixed Soft Start circuit prevents in-rush current during startup along with UVLO (low voltage error prevention circuit) and TSD (thermal shutdown detection) protection circuits. An EN pin allows for simple ON/OFF control of the IC to reduce standby current consumption. Include open-drain PGOOD LED feature for operation indication, OCP, SCP, OVP. Applications LCD TVs Set Top Boxes (STB) DVD/Blu-ray players/recorders Broadband Network and Communication Interface Amusement, other o Evaluation Board Operating Limits and Absolute Maximum Ratings (T =25 C) A Limit Parameter Symbol Unit Conditions MIN TYP MAX Supply Voltage BD95861MUV VCC 7.5 - 18 V Output Voltage / Current V 0.8 - 5.5 V * Set by R ,R and R OUT 2 3 4 BD95861MUV I - - 6 A OUT Evaluation Board Below is the evaluation board with the BD95861MUV. Vout GND EN BD9673EFJ Eval Board Fig 1: BD95861MUV Evaluation Board 1 Applic ation Note Evaluation Board Schematic Below is the evaluation board schematic for BD95861MUV. Fig 2: BD95861MUV Evaluation Board Schematic Evaluation Board I/O Below is the reference application circuit that shows the inputs (VIN and EN) and the outputs (VOUT and PGOOD) Fig 3: BD95861MUV Evaluation Board I/O Evaluation Board Operation Procedures Below is the procedure to operate the evaluation board 1. Connect power supplys GND terminal to GND test point TP3 on the evaluation board. 2. Connect power supplys VCC terminal to VIN test point TP1 on the evaluation board. This will provide VIN to the IC U1. Please note that the VCC should be in range of 7.5V to 18V. 3. Check if shunt jumper of J1 is at position ON (Pin2 connect to Pin1, EN pin of IC U1 is pulled high as default). 4. Now the output voltage VOUT (+5V) can be measured at the test point TP2 on the evaluation board with a load attached. The load can be increased up to 6A MAX. Page 2 of 11