BD9C501EFJ-EVK-001 ROHM

Switching Regulator Series Step-Down DC/DC Converter BD9C501EFJ Evaluation Board BD9C501EFJ-EVK-001 Description This evaluation board has been developed for ROHMs synchronous buck DC/DC converter customers evaluating BD9C501EFJ. While accepting a power supply of 4.72-18V, an output of 3.3V can be produced. The IC has internal 50m high-side P-channel MOSFET and 35m low-side N-channel MOSFET and a synchronization frequency is of 500kHz. A Soft Start circuit prevents in-rush current during startup. An EN pin allows for simple ON/OFF control of the IC to reduce standby current consumption. Include OCP (Over Current Protection) and SCP (Short Circuit Protection). Evaluation Board Operating Limits and Absolute Maximum Ratings (Ta=25) Limit Parameter Symbol Unit Conditions MIN TYP MAX (NOTE1) Supply Voltage V 4.5 - 18 V CC V - 3.3 - V OUT Output Voltage / Current I - - 5 A OUT (NOTE1) When the output voltage is 3.3V, it is 4.72V by limiting ratio of the maximum duty. Evaluation Board Figure 1. BD9C501EFJ-EVK-001 Evaluation Board www .rohm.com 9 December 2014 Rev.002 2014 ROHM Co., Ltd. All rights reserved. 1/8 BD9C501EFJ-EVK-001 Operation Procedures 1. Necessary equipments (1) DC power-supply of 4.7V to 18V/5A (2) Maximum 5A load (3) DC voltmeter 2. Connecting the equipments (1) DC power-supply presets to 12V and then the power output turns off. (2) The max. load should be set at 5A and over it will be disabled. (3) Check Jumper pin of SW1 is short, between intermediate-terminal and OFF-side terminal. (4) Connect positive-terminal of power-supply to VIN+terminal and negative-terminal to GND-terminal with a pair of wires. (5) Connect loads positive-terminal to VOUT+terminal and negative-terminal to GND-terminal with a pair of wires. (6) Connect positive-terminal of DC voltmeter 1 to TP1 and negative-terminal to TP2 for input-voltage measurement. (7) Connect positive-terminal of DC voltmeter 2 to TP3 and negative-terminal to TP4 for output-voltage measurement. (8) DC power-supply output is turned ON. (9) IC is enable (EN) by shorting Jumper-pin of SW1 between intermediate-terminal and ON-side terminal. (10) Check DC voltmeter 2 displays 3.3V. (11) The load is enabled. (12) Check at DC voltmeter 1 whether the voltage-drop (loss) is not caused by the wires resistance. - DC Voltmeter 2 V - + V DC Voltmeter 1 - + Load + - DC Power + Figure 2. Connection Diagram Enable-Pin To minimize current consumption during standby-mode and normal operation, Enable-mode can be switched by controlling EN pin (6pin) 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 2.0V. www.rohm.com 9 December 2014 Rev.002 2014 ROHM Co., Ltd. All rights reserved. 2/8