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User
’s Guide
BD9A301MUV-EVK-001
© 2017 ROHM Co., Ltd.
No. 60UG004E Rev.001
APR.2017
Operation Procedures
1. Necessary equipments
(1) DC power-supply of 2.7V to 5.5V/3A
(2) Maximum 3A load
(3) DC voltmeter
2. Connecting the equipments
(1) DC power-supply presets to 5.0V and then the power output turns off.
(2) The maximum load should be set at 3A 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 load’s 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 1.8V.
(11) The load is enabled.
(12) Check at DC voltmeter 1 whether the voltage-
drop (loss) is not caused by the wire’s resistance.
Figure 1. Connection Diagram
Enable-Pin
To minimize current consumption during standby-mode and normal operation, Enable-mode can be switched by controlling EN pin
(15pin) 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 0.5V, and normal-mode operation when
it is over 2.0V.
+
−
+
−
+
−
DC Power
+
−
DC
Voltmeter
1
DC
Voltmeter 2
V
V
Load
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