Test Procedure for the LV8400VEVB Evaluation Board For DC Motor Control: Osclloscope CURRENT PROBE AMPLIFIER 1 PROBE INPUT CHANNEL OUTPUT 1 2 3 4 DC Motor Power supply1 A V Multimeter I OUT - + + Power supply2 A V - + Function generator Hz CHANNEL 1 1/8/2014 1 2 www.onsemi.com Table1: Required Equipment Equipment Power Supply1 Power Supply2 Function generator Multimeter Oscilloscope Current probe LV8400V Evaluation Board DC Motor Efficiency 18V-4A 6V-0.5A 200kHz 4 channel 18V-2A Test Procedure: 1. Connect the test setup as shown above. 2. Set it according to the following specifications: Supply Voltage: • VM (4.0 to 15.0V): Power Supply for LSI • VCC (2.7 to 5.5V): Logic “High” voltage for toggle switch Toggle Switch State: • Upper Side: High (VCC) • Middle: Open, enable to external logic input • Lower Side: Low (GND) Operation Guide: • You can drive DC motor by setting EN=High and switching the input signal as follows: EN H L 1/8/2014 IN1 H H L L - Table2: Truth table IN2 OUT1 OUT2 H L L L H L H L H L Z Z Z Z Mode Brake Forward Reverse Standby All function stop “-“ : denotes a don't care value. Z: High-impedance 2 www.onsemi.com 3. Check the IN1 and IN2 terminal voltage at scope CH1 and CH2, and the output current waveform at scope CH3. Table3: Desired Results INPUT OUTPUT VM=12.0V The output current and rotation of the DC VCC=5.0V motor is confirmed. (The Iomax and Iopeak confirm whether IN1=High IN2=2.5Hz(Duty50%) it is allowed by this output current.) 100ms/div CH1 IN1 5V/div CH2 IN2 5Vdiv CH3 IOUT12 1Adiv 4. By setting ICTRL to High, constant current output circuit operates. * The output constant current (IOUT) is determined by the internal reference voltage and the sense resistor between the ISET and SGND pins. IOUT = Internal reference voltage (0.2V) ÷ Sense resistor (RSET). IOUT calculating formula: 0.2[V ] IOUT = ≅ 5.0[mA] 39Ω Check the multimeter, and it is confirmed that about 5mA is displayed. 1/8/2014 3 www.onsemi.com